Matlab Plot Line Along Vector

Plotting with MATLAB MATLAB is very useful for making scientific and engineering plots. If a function is computed on this grid, say z = f(X;Y), then the command >plot3(X,Y,z) forms a linear plot much like that of the two dimensional plot command. Dot Products Ref: Hibbeler § 2. Load the patients data set, and convert the Smoker data to a categorical array. This becomes obvious if you do not use enough sample points when plotting a smooth function. This would mean plotting along the line y = 0 where x varies from 0 to pi first, then plotting along the line x = pi where y varies from 0 to pi second, and finally plotting along the line y = x. Row vectors are created by enclosing the set of elements in square brackets, using space or comma to delimit the elements. We will solve the equation of the line for z, and use the MATLAB plotting function ezsurf to plot the result. Multidimensional arrays in MATLAB are an extension of the normal two-dimensional matrix. MATLAB Input and Output MATLAB Input and Output Matlab/Simulink Dipl. The code begins by customizing the Smith Chart plot parameters for smith_rab_v2. It integrates computation, visualization, and programming in an easy-to-use environment where problems and solutions are expressed in common mathematical notation. Plot function along one direction. How to plot a line of a certian color. If A is a multidimensional array, then mean(A) operates along the first array dimension whose size does not equal 1, treating the elements as vectors. Now we will see a few examples of plots and how they work. To start MATLAB in Windows: double click the desktop MATLAB icon To start MATLAB in Linux: enter matlab at the system prompt of a X-Forwarding window scc1% matlab & In either case, a MATLAB command window appears, along with a >> prompt. This function is an improvement over the CLINE function previously made available on TMW File Exchange. arrays of numbers. Basically, you give a vector in the "for". Learn more about plot, 2d, linspace, length, distance, marker, distance along line, distance along curve MATLAB Answers. • a - color of the line & symbol • b - style of the symbols (markers) • c - style of the line • See Table 5. This MATLAB function plots the array response pattern along the azimuth cut, where the elevation angle is 0. However, you'll have to compute the direction of the arrow yourself. This is what my code looks like: So basically for the loop j =1:100, everytime the code goes through the j loop (for 100 times) and looks into the i loop and changes/does not change it, I would like to. Plots and graphs are perhaps the most convenient way to present engineering information and scientific data. Axis Properties. Discover what MATLAB. The resulting scatter plot contains overlapping data points. *v; Use the sum function to get the sum of squares of elements of vector v. If Matlab can't find a solution it will return an empty symbol. Then, create a scatter histogram chart that compares patients' Age values to their smoker status. Learn more about plot, 2d, linspace, length, distance, marker, distance along line, distance along curve MATLAB Answers. Since MATLAB includes a number of different options for creating two-dimensional plots, I have decided to split the explanation over three posts. For example, if we want to plot on the interval (-π,π) we can do this simply as. Superimposing line plots on images 152 Posted by Steve Eddins , January 1, 2007 Several people have asked me recently how to plot some kind of shape on top of an image, so I thought I'd show the basic technique here. Toggle Main Navigation. x is plotted along the horizontal axis, and y equals 2. The point cloud data is then discretized. This MATLAB function calculates differences between adjacent elements of X along the first array dimension whose size does not equal 1: In this plot the blue line. In the following example a very large vector is defined and can be easily manipulated. Display red markers at the minimum and maximum data values by setting the MarkerIndices property to a vector of the index values. MATLAB Basics EE107: COMMUNICATION SYSTEMS • Built-in graphics for visualizing data and tools for creating custom plots 2. The input for such a plot consists of two vectors (lists of numbers). Create a vector of random data and find the index of the minimum and maximum values. How can I create a vector of markers for a scatter plot. d d = 3 12 27 48 or of the variable b. The matrices x,y,z,u,v, and w must all be the same size and contain the corresponding position and vector components. When you create an array of plots in the same figure, each of these plots is called a subplot. Advertise. You should find this useful not only for visualizing the solutions of ODEs, but also for plotting general data that might appear in other courses and work. An array of p cells, where each cell contains a n x m numeric matrix. Animation Techniques. I don't know what approach to try. • a - color of the line & symbol • b - style of the symbols (markers) • c - style of the line • See Table 5. Display red markers at the minimum and maximum data values by setting the MarkerIndices property to a vector of the index values. Update the text to match the y-value as it moves along the line. stem(X,Y) plots X versus the columns of Y. Example: fimplicit(f,'--or') plots a red, dashed line with circle markers. Stream Line Plots of Vector Data. To do anything significant in Matlab, you have to load in data files and then save your output. Notice that X increases along the columns from left to right in the x variable; Y increases along the rows from top to bottom in the y variable. Learn more about matlab function, function MATLAB. However, if not specified, MATLAB automatically cycles through a predefined (but user settable) list of colors to identify each line. De first column of each matrix represents the x-coordinate and the second column represents the y. Row vectors are created by enclosing the set of elements in square brackets, using space or comma to delimit the elements. MATLAB ® automatically selects the contour lines to display. You can also change the type of line used to connect the points by including a third argument specifying line type. Notes on the plotting code, above: 1. This MATLAB function retrieves the intensity values of pixels along a line or a multiline path in the grayscale, binary, or RGB image in the current axes and displays a plot of the intensity values. The basic use of the built-in function plot is: plot(x, y) where x = array of x-values y = array of y-values 3. An array having more than two dimensions is called a multidimensional array in MATLAB. Plot a straight line in Matlab 1. This method requires little experience in programming, so dive in with step one to get started. We did the same thing for the y coordinates. MATLAB Marina – 2D Plotting Primer. There are two ways to load and save data in Matlab; either use the high level, easy to use functions, or the low level, harder to use functions. How do I plot the divergence of a vector field along a parametric line?. Marker symbols such as 'o' are ignored. Matlab script files are invoked by typing their names without the. If the matrix is square, then the function plots each column versus the vector. I've plotted a centerline along an ellipse in my image by using ginput to select 2 points and then drawing the line connecting them. x is plotted along the horizontal axis, and y equals 2. Line Charts in MATLAB ®. Matlab should tell you : >> Z(:) ans = 1 2 4 3 34 90 5 9 1 First, please note that we have a column here. MATLAB (matrix laboratory) is a multi-paradigm numerical computing environment and proprietary programming language developed by MathWorks. No can do with a single line, linestyle is a property of the entire line, not of the points or line segments along the line. This MATLAB function plots a line in a geographic axes with vertices at the latitude-longitude locations specified (in degrees) by the vectors lat and lon. The profile line plot I am looking something like improfile function. I don't know what approach to try. MATLAB ® automatically selects the contour lines to display. This MATLAB function retrieves the intensity values of pixels along a line or a multiline path in the grayscale, binary, or RGB image in the current axes and displays a plot of the intensity values. A straight line is a 1st-degree polynomial, so the. De first column of each matrix represents the x-coordinate and the second column represents the y. Generally to generate a multidimensional array, we first create a two-dimensional array and extend it. A stream particle animation is useful for visualizing the flow direction and speed of a vector field. This can be done using the diary command. You do not need to specify all three characteristics (line style, marker symbol, and color). Note that if LineSpec cell array has less elements than XData and YData then line spec will be periodically reused. SYNTAX: n=hist(y) - Bins the elements in vector y into 10 equally spaced containers and returns the number of elements in each container as a row vector. If A is a matrix, then mean(A) returns a row vector containing the mean of each column. If X is a scalar and Y is a vector, disconnected line objects are created and plotted as discrete points vertically at X. This example shows how to use stream lines, slice planes, and contour lines in one graph. SYNTAX: n=hist(y) - Bins the elements in vector y into 10 equally spaced containers and returns the number of elements in each container as a row vector. Matlab should tell you : >> Z(:) ans = 1 2 4 3 34 90 5 9 1 First, please note that we have a column here. MATLAB Figure window For plotting variables in the MATLAB workspace and editing plot properties MATLAB Graphics documentation Data Statistics dialog box For calculating and plotting descriptive statistics “Example — Using MATLAB Data Statistics” on page 1-28 Basic Fitting dialog box data www. MATLAB (matrix laboratory) is a multi-paradigm numerical computing environment and proprietary programming language developed by MathWorks. (Typically, it is the window with the highest number. Use Plotly with MATLAB ® to share your figures with non-MATLAB ® users, to create web-based MATLAB ® dashboards, as the visualization toolbox in MATLAB ® web applications, or just for publication quality vector image export. Axis Properties. MATLAB is an interactive system whose basic data type is the array or. Move the marker and text to each subsequent point along the line by updating the Matrix property of the transform object. plot(Y) plots the columns of Y versus their index. There is the 2, and there is a line drawn to the second point. MATLAB's ability to evaluate functions of vectors elementwise, for example sin(2*pi*x), is incredibly useful for plotting functions. I would like to have a 2D plot along with a 3D surface or mesh plot - shown by the blue line I drew on the surface plot below. Other properties can be set inside the plot command. sigline(xs,lbl) places a text lbl beside the significance line. % sums the elements of B along. d d = 3 12 27 48 or of the variable b. Prerequisites The 2D Plotting Primer assumes knowledge of the MATLAB IDE, MATLAB help, arithmetic operations, built in functions, scripts, variables, arrays, logic expressions, conditional structures,. How do I get it?. In other words we have to tell it for which x and y to actually draw the vector field. Our objective is to plot a line along 2 points in MATLAB without using inbuilt functions for plotting. Row vectors are created by enclosing the set of elements in square brackets, using space or comma to delimit the elements. Generate Vector Data for Points Along Great Circle or Rhumb Line Tracks. X-Y Line Plots. (3) Requires xdata vector with x-data points. Display red markers at the minimum and maximum data values by setting the MarkerIndices property to a vector of the index values. Plots and Matrix Algebra in MATLAB Objectives: 1. This method utilizes a MATLAB script employing equations of the three-point vector method to generate geologic attitude data from Cartesian coordinates of triangular planar surfaces and create a tangent diagram (, p. sigline(xs,lbl) places a text lbl beside the significance line. Series of screencasts on basic MATLAB usage. A stream particle animation is useful for visualizing the flow direction and speed of a vector field. The matrices x,y,z,u,v, and w must all be the same size and contain the corresponding position and vector components. Transparent legend – Matlab chart legends are opaque be default but can be made semi- or fully transparent. The particles trace the flow along a particular stream line. For example, the subaxes along the diagonal in the i th column is replaced by histogram(X(:,i)). X-Y Line Plots. This MATLAB function retrieves the intensity values of pixels along a line or a multiline path in the grayscale, binary, or RGB image in the current axes and displays a plot of the intensity values. This MATLAB function calculates differences between adjacent elements of X along the first array dimension whose size does not equal 1: In this plot the blue line. x is plotted along the horizontal axis, and y equals 2. Now you can go to the MATLAB command window and at the command line type. A quiver plot displays velocity vectors as arrows with components (u,v) at the points (x,y). If Matlab is successfully executed, a small pop up window will appear with the Matlab logo. How to plot a line of a certian color. (Notice that the second command has a ”;” at the end of the line. Plot lines in 3-space] 3D mesh plots [MATLAB: mesh, meshc, meshz, waterfall. We will solve the equation of the line for z, and use the MATLAB plotting function ezsurf to plot the result. quiver3(z,u,v,w) plots vectors with directions determined by components (u,v,w) at equally spaced points along the surface z. For example, if you omit the line style and specify the marker, then the plot shows only the markers and no line. Matlab plotting line style Just like it is to change the color of your plot in Matlab, the same goes for changing the line style, increasing the thickness of the line or some other aspect of it Let's go ahead a plot the following code. Instead, it displays the new plot in the currently active window. Creating 2-D (x,y) Plots plot(x) - plot vector x. Marker symbols such as 'o' are ignored. A stream particle animation is useful for visualizing the flow direction and speed of a vector field. Plots and graphs are perhaps the most convenient way to present engineering information and scientific data. Unlike the plot function, the line function does not call newplot before plotting and does not respect the value of the NextPlot property for the figure or axes. Discover what MATLAB. PolarAxes objects have properties that you can use to customize the appearance of the polar axes, such as the font size, color, or ticks. Syntax for the command is − subplot(m, n, p) where, m and n are the number of rows and columns of the plot array and p specifies where to put a particular plot. Line color, specified as a MATLAB Add markers at each data point along the line by specifying a marker symbol. No plot is drawn on the screen; however, you can plot the function using plot(X,Y). plots data in the x and y vectors by connecting each pair of points with a red dashed line. Learn more about plot, 2d, linspace, length, distance, marker, distance along line, distance along curve MATLAB Answers. >> plot(x,y); This will produce a plot of the sine wave from 0 to 2pi. You can plot a straight line just as you would plot any other function in Matlab. However, you'll have to compute the direction of the arrow yourself. MATLAB's ability to evaluate functions of vectors elementwise, for example sin(2*pi*x), is incredibly useful for plotting functions. plotmatrix(X) is the same as plotmatrix(X,X) except that the subaxes along the diagonal are replaced with histogram plots of the data in the corresponding column of X. my_test_program Up comes the plot of the array c against the array d. Find the point in which the line through (1,1,1) and (1,3,0) meets the plane of Problem 1. This example show you how to load a simple data set and plot it. When this scalar (magnitude) is. Use the x and y values of the next point in the line and the first point in the line to determine the transform matrix. MATLAB (matrix laboratory) is a multi-paradigm numerical computing environment and proprietary programming language developed by MathWorks. This chapter deals with graphing capabilities and provides examples. If the matrices (or vectors which are special cases of a matrices) are of the same dimensions then matrix addition, matrix subtraction and scalar multiplication works just like we are used to. Array variables can be scalars, vectors, or matrices: Scalar n = 1 is represented as a 1 1 array Vector a = [1 2 3] is a 1 3 array Matrix 12 3 4 56 7 8 A is a 2 4 array. We answer questions so that everyone can learn from what we write. The line types available are: '-' solid line (default) '--' dashed line ':' dotted line. Stream Line Plots of Vector Data. I'm interested in calculating the components of the vector v along the line that passes by P1 and P2. Each box plot bar will use the n values from the corresponding data set. Neural Networks: MATLAB examples Define input vector Calculate neuron output Plot neuron output over the range of inputs plots the classification line, and. An array having more than two dimensions is called a multidimensional array in MATLAB. Open Mobile Search. Superimposing line plots on images 152 Posted by Steve Eddins , January 1, 2007 Several people have asked me recently how to plot some kind of shape on top of an image, so I thought I'd show the basic technique here. Typing >> plot(y) >> grid should bring up a gur e displaying y(x) against x on a grid. MATLAB automatically plots the graphs in different colors so that they can be identified. The subplot command is used for creating subplots. If the number of matrix columns equals the vector length, then the function plots each matrix row versus the vector. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. To create a row vector, enclose a set of numbers in square brackets and use a space or. But I don't know how to proceed to do a 2D plot. PLOT(X,Y) plots vector Y versus vector X. Now complex operations can be defined that can be done quickly and easily. Since MATLAB includes a number of different options for creating two-dimensional plots, I have decided to split the explanation over three posts. Unlike the plot function, the line function does not call newplot before plotting and does not respect the value of the NextPlot property for the figure or axes. MATLAB MATLAB is a software package for doing numerical computation. If X or Y is a matrix, then the vector is plotted versus the rows or columns of the matrix, whichever line up. The first order is for the rows and the second order is for the columns, the pixel value will determine the color of the pixel based. (Notice that the second command has a ”;” at the end of the line. MATLAB actually plots the points (x(i), y(i)) joined by straight line segments. Plot a sine wave and a red marker at the beginning of the line. how to plot column vector data along y-axis in matlab? Ask Question In MATLAB, I want to plot grade values along x-axis and indices (1-14) along y-axis. If the matrix is square, then the function plots each column versus the vector. The column and row indices of Z are the x and y coordinates in the plane, respectively. Generate Vector Data for Points Along Great Circle or Rhumb Line Tracks. This is what my code looks like: So basically for the loop j =1:100, everytime the code goes through the j loop (for 100 times) and looks into the i loop and changes/does not change it, I would like to. PolarAxes objects have properties that you can use to customize the appearance of the polar axes, such as the font size, color, or ticks. An example of putting multiple curves on a plot Here are the MATLAB commands to create a symbol plot with the data generated by adding noise to a known function. Use the x and y values of the next point in the line and the first point in the line to determine the transform matrix. Introduction to Plotting and Vectorization This lab will provide an introduction to two dimensional plots. Since MATLAB includes a number of different options for creating two-dimensional plots, I have decided to split the explanation over three posts. As with plotting single lines, the color, line style and marker information can be specified explicitly. If the matrix is square, its columns plot against the vector if their lengths match. Using a line plot, show the azimuth cut response of a. x-axis label displayed below the bottom axes. A stream particle animation is useful for visualizing the flow direction and speed of a vector field. If X or Y is a matrix, then the vector is plotted versus the rows or columns of the matrix, whichever line up. Asked and marker are the same for every point along the line. If the matrix is square, then the function plots each column versus the vector. Subscribe to view the full document. A straight line is a 1st-degree polynomial, so the. To Turn in: By Thursday, 11/1/07, post on your website the answers to the questions in pink, as with Matlab 1. MATLAB ® automatically selects the contour lines to display. You can plot multiple lines at once, using pairs of x- and y-data. Matlab plotting line style Just like it is to change the color of your plot in Matlab, the same goes for changing the line style, increasing the thickness of the line or some other aspect of it Let's go ahead a plot the following code. How do I plot a constant value over multiple Learn more about array. 282 at Johns Hopkins University. How do I plot the divergence of a vector field along a parametric line?. Learn more about matlab function, function MATLAB. Advertise. By default, the legend will be added to the top right corner. We will not run the script file at this moment. A row vector is recorded as a 1 nmatrix and a column vector is recorded as a m 1 matrix. A stream particle animation is useful for visualizing the flow direction and speed of a vector field. Plot markers transparency and color gradient - Matlab plot-line markers can be customized to have transparency and color gradients. Toggle Main Navigation. Use the x and y values of the next point in the line and the first point in the line to determine the transform matrix. The vector of each pair must have the same length. plot(Y) plots the columns of Y versus their index. This method utilizes a MATLAB script employing equations of the three-point vector method to generate geologic attitude data from Cartesian coordinates of triangular planar surfaces and create a tangent diagram (, p. to Matlab and you are expected to use Matlab to complete the assignment. Example 3: Let us now use the plotting capabilities of MATLAB to plot the plane and the line. Next, I would like to figure out the coordinates of 10 evenly spaced points along this line and plot them on top of the current image, creating a spine of 12 points (10 + the 2 original) along the ellipse. Those numbers are called the "elements" of the vector. To learn how to program loops 3. I was told you don't use the fplot command. If you do not want tick marks along the x-axis, specify an empty vector []. This is also called the. The people who answer questions here are volunteers. To do anything significant in Matlab, you have to load in data files and then save your output. If the matrices (or vectors which are special cases of a matrices) are of the same dimensions then matrix addition, matrix subtraction and scalar multiplication works just like we are used to. The notation for a row vector, x =(1,2,3,4) is: >> x=[1,2,3,4] x= 1 2 3 4. To enter a row vector in Matlab, type the following in the command window: ˛ v = [0 1 2 3] and press enter. I had to use a network analyzer measuring the standing wave pattern along a transmission line taking data points at half mm increments. fplot uses adaptive step control to produce a representative graph, concentrating its evaluation in regions where the function's rate of change is the greatest. The MATLAB command plot is just a point plotter, not a function plotter. Axis Properties. to let you create a plot in angle space (line or polar. MATLAB allows matrix manipulations, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs written in other languages. I have the following plot and a file of the data which creates that plot. In this case, you can use the command quiver3 in Matlab to visualize the rays in 3D. along with the MATLAB output. Something along the lines of this is ugly but should get you started (but you probably want to normalize the direction vector to get a nicer graph). plot(X,Y) plots vector Y versus vector X. The basic data structure in Matlab is the two-dimensional array. In this activity we will introduce Matlab's quiver command, which will assist in creating visualizations that help develop a deeper understanding of velocity and acceleration in the plane and three-space. The line types available are: '-' solid line (default) '--' dashed line ':' dotted line. MATLAB Basics EE107: COMMUNICATION SYSTEMS • Built-in graphics for visualizing data and tools for creating custom plots 2. PLOT(X,Y) plots vector Y versus vector X. Alternatively, you can create a cell array of character strings to define the line styles: set(gca,'LineStyleOrder',{'-*',':','o'}) MATLAB supports four line styles, which you can specify any number of times in any order. Comments and Help. A stream particle animation is useful for visualizing the flow direction and speed of a vector field. With the vector a containing the first 10 Fibonacci numbers as above (re-calculate the vector if needed), type >> plot(a) When you plot a single vector like a, Matlab plots the elements of the vectors against the position of the elements in the vector. Unlike the plot function, the line function does not call newplot before plotting and does not respect the value of the NextPlot property for the figure or axes. • if y is a matrix, then this generates several lines - one for each column in y. Subscribe to view the full document. Rather than using the LINE function a PATCH surface is generated. Also I need the coefficient of determination (R^2). stem(X,Y) plots X versus the columns of Y. This would mean plotting along the line y = 0 where x varies from 0 to pi first, then plotting along the line x = pi where y varies from 0 to pi second, and finally plotting along the line y = x. I also don't know how to plot those data points and get a best fit linear line with them. How to plot. *v; Use the sum function to get the sum of squares of elements of vector v. MATLAB was initially developed to be a user-friendly front end to the popular FORTRAN libraries LINPACK and EISPACK in the 1970s. Line style and color, specified as a character vector or string scalar containing line style symbols, color options, or both. I would like to have Matlab find the following points for me: [y,x] for peak noted by the 100% line [x] for where the plot crosses the y=0 line [x] for where y is 50% and 20% of the peak found in part 1. Multidimensional arrays in MATLAB are an extension of the normal two-dimensional matrix. plot(x,y,'abc') - plots vector x versus vector y. How to make a plot in MATLAB ®. Plot a straight line in Matlab 1. This is because MATLAB indexes vector elements beginning with one, not zero. (Typically, it is the window with the highest number. This example shows how to use stream lines, slice planes, and contour lines in one graph. This MATLAB function plots the array response pattern along the azimuth cut, where the elevation angle is 0. In general, find(X) regards X as X(:), which is the long column vector formed by concatenating the columns of X. MATLAB also helps us to plot Histogram and Pie chart. You can use plot3. The reader would be served to have this web page open along with a Matlab window. Tick values, specified as a vector of increasing values. MATLAB assigns styles to lines according to their order of creation. PolarAxes objects have properties that you can use to customize the appearance of the polar axes, such as the font size, color, or ticks. Learn more about plot, 2d, linspace, length, distance, marker, distance along line, distance along curve MATLAB Answers. Generally to generate a multidimensional array, we first create a two-dimensional array and extend it. You can visualize a vector field by plotting vectors on a regular grid, by plotting a selection of streamlines, or by using a gradient color scheme to illustrate vector and streamline densities. If A is a vector, then mean(A) returns the mean of the elements. Examples of the plot function, line and marker types, custom colors, and log and semi-log axes. For example, you can standardize the data in x or label the coordinate tick marks along the horizontal axis of the plot. I was told you don't use the fplot command. The resulting scatter plot contains overlapping data points. Invoking the script. cell array it must contain only char arrays and each cell will specify the line spec of the corresponding cell in XData and YData. All of the loop structures in matlab are started with a keyword such as "for", or "while" and they all end with the word "end". Plots and Matrix Algebra in MATLAB Objectives: 1. In the following example a very large vector is defined and can be easily manipulated. math equation MATLAB. MATLAB Central. plot(Y) plots the columns of Y versus their index. To simplify the creation of large vectors, you can define a vector by specifying the first entry, an increment, and the last entry. Matlab simply puts. There is the 2, and there is a line drawn to the second point. Now complex operations can be defined that can be done quickly and easily. For example, to create a vector whose entries are 0, 2, 4, 6, and 8, you can type in the following line: >>. So, I have a quantity I am computing, say w, a vector. However, the type of values that you specify must match the type of values along the x-axis. When this scalar (magnitude) is. Move the marker and text to each subsequent point along the line by updating the Matrix property of the transform object. At the end, you should feel comfortable plotting functions of the form f(x). See updated Answer. Announcements. The subplot command is used for creating subplots. If X is a scalar and Y is a vector, disconnected line objects are created and plotted as discrete points vertically at X. Array variables can be scalars, vectors, or matrices: Scalar n = 1 is represented as a 1 1 array Vector a = [1 2 3] is a 1 3 array Matrix 12 3 4 56 7 8 A is a 2 4 array. How to plot a line of a certian color. So I wonder if there is a way to do it differently. Write a single-line MATLAB statement to compute a column vector containing the velocities based on the values in the parameter matrix. Defines the colors used by the plot and plot3 functions to color each line plotted. The particles trace the flow along a particular stream line. To plot our least squares line, we need to generate a. quiver(x,y,u,v) plots vectors as arrows at the coordinates specified in each corresponding pair of elements in x and y. Now we will see a few examples of plots and how they work. Matlab simply puts. (Notice that the second command has a ”;” at the end of the line. To do anything significant in Matlab, you have to load in data files and then save your output. Basically, you give a vector in the "for".