I tend to use this feature when I am plotting a large number of examples or realizations of some kind and want to overlay and highlight some statistics or metrics. Scatter plot by group - MATLAB gscatter, gscatter( x , y , g , clr , sym , siz , doleg ) controls whether a legend is displayed on the graph. Next, we will define B as the cos function of values of A and C as sine function of values of A report. c = sin (A) legend({'sin(A)','cos(A)'}). Similar to all of the other graphics objects, the legend properties can be adjusted using the set() and get() functions. If you are not familiar with setting the position property on graphics object, you can see a brief description here. best. The legend() function in MATLAB/Octave allows you to add descriptive labels to your plots. The other dimension can vary. Here are the different type of plots in Matlab. Building on the previous example, we can mock up an example GUI that includes our plot, a couple of buttons, and a legend that is manually placed on the figure. Plot legend and labels. plot(x, y, x, g, ‘.-‘), legend(‘Sin(x)’, ‘Cos(x)’) MATLAB creates the following plot− Adding Labels, Grid Lines, Title, and Scaling of Matlab function plot. plot(A,B,A,C) (MATLAB has a number of grid commands. Learn more about plot scatter loop legend MATLAB, Statistics and Machine Learning Toolbox C = sin (A) Let us understand the function with an example: Example #1. Explanation: This function will create a legend for each data series used in the plot, with descriptive labels. B. b = cos (A) The location is selected using a convention based on the cardinal directions. The syntax for creating Legends in MATLAB: Hadoop, Data Science, Statistics & others. Select a Web Site. You can adjust the axes and gridlines to spruce up the graphs. 4. In such cases, we must provide more info about the functions drawn in the plot Legends are the way to provided information about different functions contained in a single plot. 3. legend({'sin(A)','cos(A)'},'Location','northwest'). This is how our input and output will look like in MATLAB console: A = 2*pi : pi/50 : 3*pi The following example will position the legend at the bottom, outside of the plot, with a horizontal orientation. Source: www.mathworks.com. The following animation illustrates all of the different keywords. I need to take the legend out of the plot in order to create a figure for a paper but I want to keep having the legend that Matlab gives me. You could call plot() 3 times with different variables and call legend and have all variable names show up in the legend. Colour legend for scatter plot. Let us understand the function with an example: First, we will define ‘A’ as a vector containing values between 2pi (π) and 3π. Sort by. The specified line format is applied to all data series, that is, all data series can have the same line type. Since nothing was passed as an argument to legend function, MATLAB created labels as ‘data1’ and ‘data2’. Introduction to MATLAB Plot legend MATLAB provides us with plenty of functionalities, useful in various computational problems. Legend function in MATLAB allows us to put our label in place of our choice. title(lgd, 'Functions'). B = cos (A) We will define an increment of π/50 between these values. Line graphics handles can be used to specify a subset of lines that will be labeled in the legend. legend ({'sin(A)', 'cos(A)'}, 'Location','northwest'). This means that your first string 'signal1' is assigned to the plot for signal1 and the second string 'signal2' is assigned to the vertical line. hide. legend positions the legend based on a variety of factors, such as what objects the legend … For example, grid MINOR toggles the minor grid lines.) Starting in R2019b, you can display a tiling of plots using the tiledlayout and nexttile functions. In your case, your legend string would be set as hLeg = legend( '$$\dot{\theta}_{in}$$' ); This can be done during the plot() call or using set() on the handle. Matlab Function Plot Legend. The following code will capture the legend handle and then set a few of the legend properties. ALL RIGHTS RESERVED. The legend would then be toggled on by calling legend() without any input arguments. A legend can be added with the following command. legend({'sin(A)','cos(A)'},'Location','northwest') 1. Specify the legend labels as inputs to the legend function. This ensures that your legend does overlap with other elements or create weird spacing. b = cos (A) By default, the legend annotates the current axes. Then, add a legend. First, let us understand why we need to have legends for our plots. Plot two lines. My plot has 10 curves, I use legend to represent them,but legend only used 7 colours,after 7 colours, it repeats the colours...which is confusing to fing the plot curve needed. There are number of other properties that can be set on the legend object. This thread is archived. Another convenient way to add the legend labels is to set the “DisplayName property on the lines as they are plotted. Notice that in addition to the names of the functions, we have added 2 more arguments: ‘Location’ & ‘northwest’. Code: a = linspace(0,2*pi); y = sin(a); plot(a,y) hold on y1 = sin(2*a); plot(a,y1) legend('sin(a)','sin(2*a)') Output: In the above example, the legend for the two lines is shown in the top right corner of the plot, one line depicting the values for the function sin(a) and the other line depicting the values for the function sin(2a). b = cos (A) Plotting. The following code snippet would place the legend in the center top of the plot. The resulting figure looks like this. We learned how to create labels in MATLAB plots and also how to achieve desired styles. In addition to that, here we will add the following code: A = 2*pi : pi/500 : 3*pi The following keywords can be used: north, south, east, west, northeast, northwest, southeast, southwest. Here we discuss introduction to Matlab Plot Legend with appropriate syntax and respective programming examples. Here are few key things to remember. Here also our initial code will be the same as above. Positioning MATLAB ® Legends Inside the Plot. MATLAB provides us with plenty of functionalities, useful in various computational problems. The source code for the included examples can be found in the GitHub repository. The axis squarecommand generates a square plot. In this particular example, the location is set to northeast, the orientation is set to vertical, the font size is set to 16, and the box outline is removed. The grid oncommand allows you to put the grid lines on the graph. I have attached screenshot of the plot, there are two blues in the curve,which is hard to find the needed curve. figure matlab plot legend . Basic Use of Plot Legends. MATLAB displays only one legend per axes. Plot legends are essential for properly annotating your figures. whatever by Determined Dolphin on May 26 2020 Donate . This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. Based on your location, we recommend that you select: . The plot command can also be used with just one input vector. The legend graphics handle can be used to directly set any of the legend properties, including manually setting the position anywhere in the figure. A = pi : pi/100 : 3*pi This is most useful when you are programmatically creating the legend string. i.e we want to convey that sin(A) and cos(A) are our ‘FUNCTIONS’. The plot legend is not generated, but the dates on the x-axis and the plot grid are. The axis equalcommand allows generating the plot with the same scale factors and the spaces on both axes. Examples to Implement Matlab Plot Legend. 67% Upvoted. You have two possibilities to fix this problem. There are certainly other use cases; however, this is a type of plot that I tend to make pretty frequently. Learn more about plotting, legend, color MATLAB The next image shows an example with the legend on the east outside. 5 comments. gscatter creates a legend by default. Call the nexttile function to create an axes object and return the object as ax1.Create the top plot by passing ax1 to the plot function. The basic syntax is: legend( ‘Description 1’, ‘Description 2’, … ). I have a problem with matlab plotting. legend(L1, L2, ...., L N) , where L1, L2 and so on represents the respective labels. Now, what if instead of ‘data1’ and ‘data2’, we want to have the name of the function as the label. How to plot graph in Matlab with legend - Matlab Tutorial - Learn Too Fast In this video, we show simply How to plot graph in Matlab with legend. The axes of a plot are a separate object in Matlab, and can be controlled by using set, get and other commands. The following example creates some random data and calculates some statistics from it. plot (A, b, A, c) Next, what if we don’t want our labels to be on the top right but in some other place on the plot. Now to understand how ‘Legend’ works, we will first plot our input functions and then use the function ‘legend’. Doesn’t legend location have “center” Does the LEGEND get relocated when zooming into a plot in MATLAB 7.1.0 (R14SP3) Does the legend in the figure move when I print it in MATLAB 7.0.1 (R14SP1) Legend at a desired location on a plot; Does the legend in the printed figure become larger after I manually move it in MATLAB 7.0.1 (R14SP1) There a number of both position and orientation options that can be used to place the legend in certain parts of the figure. The syntax for the set() should like this. Matlab programming allows you to add labels, titles along with the graph of the x-axis and y-axis. As we have learned in our previous articles, we can create vector plots in MATLAB using the ‘plot’ function. Help with plot legend. by melissa. figure In both cases, after you have set the properties, you need to all legend() without any arguments to toggle the legend on. Rather than providing character strings for all of the lines on the plot, it is possible to specify an array of specific line objects that should be included in the legend. This function is useful for labeling multiple plots on the same axes. In this article, we will learn how to put Legends to the plots created in MATLAB. First, let us […] x = linspace (0,pi); y1 = cos (x); plot (x,y1, 'DisplayName', 'cos (x)' ) hold on y2 = cos (2*x); plot (x,y2, 'DisplayName', 'cos (2x)' ) hold off legend. Add a legend with a description for each chart. Let’s start with a simple Matlab plot with a legend: hold all ; hLine1 = plot ( 1 : 5 ) ; hLine2 = plot ( 2 : 6 ) ; hLegend = legend ( [ hLine1,hLine2 ] , 'Location' , 'SouthEast' ) ; hLegend. As we have learned in our previous articles, we can create vector plots in MATLAB using the ‘plot’ function. To plot two lines and display the legend in the present chart. 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. New comments cannot be posted and votes cannot be cast. Learn more about legend, plotting matlab,plot,legend,movie. All we need to do is pass the pre-defined code for the direction, as an argument. Similarly, all of the other keywords can be used to place the legend around the plot. The strings defined in the legend command are assigned in order of the plots being generated. Explanation: As we can clearly see in our output, the label is now on the top left (north west direction). We create plots for visualizing our data and as we learned already, a single plot can have more than 1 vector or function in it. c = sin (A) We will define an increment of π/50 between these values. % Learn about API authentication here: https://plotly.com/matlab/getting-started % Find your api_key here: https://plotly.com/settings/api fig = figure; plot ( [1 2 3 4 5 6 7 8], [1 2 5 6 3 3 2 5] ); hold on plot([1 2 3 4 5 6 7 8],[1 6 2 3 4 7 7 8]) ; legend ( 'blue trace', 'orange trace' ); Learn more about matlab, plotchildren, legend, order MATLAB Our inputs A, B& C are first passed as arguments to the function ‘plot’. In this article, I covered several ways to use the legend() function in MATLAB/Octave. The Plot. MATLAB allows you to add title, labels along the x-axis and y-axis, grid lines and also to adjust the axes to spruce up the graph. InternationalJournal of Risk and Safety in Medicine, 22, 103110. figure Explanation: As we can see in the above output, we have plotted 2 vectors and our legend function created corresponding labels. The syntax for the plot() should look like this. By default the legend has been placed in the upper, right corner; however, the ‘location’ keyword can be used to adjust where it is displayed. How to reorder legend entries with plot children. legend associates strings with the objects in the axes in the same order that they are listed in the axes Children property. legend(string_matrix) adds a legend containing the rows of the matrix string_matrix as labels. The position property allows us to set the exact position of the legend by specifying its horizontal origin (h0), vertical origin (v0), width (w) and height (h). figure Title . save. In addition to specifying the labels as individual character strings, it is often convenient to collect the strings in a cell array. The above will plot the sine curve and display the legend text formatted as per the LaTeX string. Labels become very important when we plot multiple functions in the same graph. The xlabel and ylabelcommands generate labels along x-axis and y-axis. Learn more about legend, plotting Explanation: As we can notice in the output, our label box is now named. In this article, we will learn how to put Legends to the plots created in MATLAB. share. © 2020 - EDUCBA. The legend() function in MATLAB/Octave allows you to add descriptive labels to your plots. You could make 3 arrays, st1, st2, and st3, and call plot(st1), plot(st2), and plot(st3) and then call legend and have 3 lines with each name beside a line in the legend. Legend Position on a plot. The keyword ‘outside’ can also be appended to all of the locations to place the legend outside of the plot. legend. Simply call get(hl) in the command window to display them all. 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Legend around the plot i tend to make pretty frequently convenient to collect strings...... Bug and workaround in timeseries plot – MATLAB plot legend with appropriate syntax and respective examples... The axes in the same as the first example shown earlier in the output, we recommend that you:... Convenience, this is a pretty nice plot ( ) function in MATLAB/Octave allows you to descriptive! Legend in certain parts of the figure, statistics & others handles can be done during plotting.