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Introduction to Matlab Legend

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Working of Matlab Legend

Syntaxes that are used in Matlab:

L=legend: This is used to include the legend in the plotted data series.

L=legend (label of the legend 1…label of the legend N): This includes the legend labels in the graph as specified in the labels argument. We can mention the label in the form of strings or characters. For example, legend (‘Mon’,’Tue’,’Wed’)

L=legend (labels of the legend): This is used to mention the labels in the legend. Labels can be a string array, character vectors or a character matrix.

L=legend (subset included): This includes only the values that are present in the subset. We can specify the subset as the values or no arguments in the input.

L=legend (__,’location of the legend’): This is used to specify the location of the legend that should be placed in the plot. This property of the legend should always be given after all the input arguments.

L=legend (__,’orientation of the legend’): This is used to specify the orientation of the legend that should be placed in the plot. The default value of the orientation is vertical.

L=legend(bkgd): This is used to set the background appearance and its outline. The default value of it is ‘boxon’.

L=legend(visibility): This is used to set the visibility of the legend which has different values like the show, hide and toggle.

L=legend(off): This is used to delete the legend and its customization from the plot.

Examples of Matlab Legend

Please find the below examples that explain the use of legends in Matlab:

Example #1

To plot two lines and display the legend in the present chart.

Code:

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).

Example #2

To plot another line and specify the labels of the legend using DisplayName property of the legend in the plot command. In this example, we have added another line to the existing line as mentioned in the above example.

Code:

Output:

In the above example, another line is added to an existing plot using the legend label in the plot command as shown in the highlighted part. This can be done by using the legend property ‘DisplayName’ and the label of the legend as its value. Here sin(3a) is the value and it is added as legend label to the plot.

There are various properties of the legend in Matlab which are discussed below. Location is one of the main property of the legend which decides the location of the legend.

There are various values that can be assigned to the property like:

north: This is used to plot the legend in top of the axes or chart and is placed inside of the chart.

northeast: This is used to plot the legend in the top right of the axes or chart.

northwest: This is used to plot the legend in the top left of the axes or chart.

northoutside: This is used to plot the legend on top of the axes and it is outside.

south: This is used to plot the legend at the bottom of the axes or chart and is placed inside of the chart.

southeast: This is used to plot the legend in the bottom right of the axes or chart.

southwest: This is used to plot the legend in the bottom left of the axes or chart.

southoutside: This is used to plot the legend at the bottom of the axes and it is outside.

east: This is used to plot the legend in the right of the axes or chart and is placed inside of the chart.

eastoutside: This is used to plot the legend in the right of the axes and it is outside.

west: This is used to plot the legend in the left of the axes or chart and is placed inside of the chart.

westoutside: This is used to plot the legend in the left of the axes and it is outside.

There are many other locations apart from this which are also used in Matlab.

We can also decide the visibility, orientation of the legend which can be horizontal and vertical depending on the requirements.

Example #3

To delete the legend from the plot.

Code:

Output:

Code:

legend(‘off’)

Output:

Conclusion

Legend is used in most of the graphs to label the behavior of different lines in the plot. There are many other properties that are associated with the customization of the legend in Matlab.