TeX (LaTeX math mode) symbols in legends and labels in MATLAB figures

I am plotting some data which includes estimates of some parameters. I want to describe the estimates by using \hat on the parameter symbols. This I have to do in legends and axis labels fields. I could not fix this matter despite some experiments using information from MATLAB help. Any idea, please to fix this problem.

I really appreciate help on this matter which will improve the look of my presentation.

Shah

Answer 1

[Matthew Simoneau]

By default, MATLAB supports a subset of TeX markup. For a list of supported symbols, see the documentation .

For more symbols, you can use LaTeX markup by setting the Interpreter property to 'latex'. Use dollar symbols around the text. For example:

title('$\hat{\psi}$','Interpreter','latex')

If you are using the legend function in R2018a or earlier, you must specify the labels as a cell array to distinguish the labels from the name-value pairs. In R2018b and later, the cell array is not needed.

plot(1:10)
legend({'$\hat{\psi}$'},'Interpreter','latex') % R2018a and earlier
legend('$\hat{\psi}$','Interpreter','latex') % R2018b and later

When you use LaTeX markup, the displayed text uses the default LaTeX font style. The FontName, FontWeight, and FontAngle properties no longer have an effect. To change the font style, use LaTeX markup instead.

For more information on using LaTeX in plot titles, labels, and legends, refer to the following example:https://www.mathworks.com/help/matlab/creating_plots/greek-letters-and-special-characters-in-graph-text.html#mw_421aadf2-3104-41f5-ae7e-57bf5f7cdde3

[Myrthe Breedijk]

I am using this information to plot my legend. However, I want to have multiple labels in the legend and now it only displays the last input of the legend. I am working with Matlab R2014b. Can you help me how to fix this?

figure
plot(t_two2,edim_two2,t_two3,edim_two3,t_two4,edim_two4,t_two5,edim_two5,t_two6,edim_two6,'LineWidth',4);
xlabel('t')
ylabel('$\displaystyle e^{*}=\frac{N^{2}}{b_{0}^{2}w\mathcal{L}}e$','interpreter','latex')
legend({'$\Pi_{5}=60$'},{'$\Pi_{5}=30$'},{'$\Pi_{5}=20$'},{'$\Pi_{5}=50$'},{'$\Pi_{5}=70$'},'Interpreter','latex','Location','southeast');
title('Kinetic energy','interpreter','latex')
FontSize = 36;
ax = gca;   
ax.FontSize = 24;
    

[SOURAV KUMAR]

Hi @Myrthe Breedijk ,

You should use the following syntax for legend() :

legend({'$\Pi_{5}=60$','$\Pi_{5}=30$','$\Pi_{5}=20$','$\Pi_{5}=50$','$\Pi_{5}=70$'},'Interpreter','latex','Location','southeast');

It works on my system (Matlab R2013a),

check on yours

[Bokang Zhou]

@Matthew Simoneau

Thank you for your answer, but how do I use two different interpreters in the same label line?

For example:

If I use 'latex', I get the desired symbol \varphi but can't get the font of words in Time New Roman.

xlabel('Power factor angle, $\varphi$','Interpreter','latex')

If I use 'tex', I get the desired font of words in Time New Roman, but can't get the symbol \varphi since 'tex' does not support \varphi.

xlabel('Power factor angle, \phi','Interpreter','tex')

So I wonder if there is a way to have normal font of words and 'latex' font of symbol in one label line.

Answer 2

[Mikhail Smirnov]

You can do like this

plot(1:10);
leg1 = legend('$\bar{x}$','$\tilde{x}$','$\hat{x}$');
set(leg1,'Interpreter','latex');
set(leg1,'FontSize',17);

works well

[Walter Roberson]

Ahmad Alsharif comments to Mikhail Smirnov:

This helped me in creating multi line legend with latex as interpreter

[Thomas Gillet]

Hello Everyone,

When I use Latex interpreter, I am not able to change the font of the legend as you mentionned with set(leg1,'FontSize',17); Have you any idea ? Thank's, Thomas

Answer 3

[Frederik van der Walt]

l= legend(['$\hat{\psi}$']);
set(l,'Interpreter','Latex');

Answer 4

[Steven]

Try with Latex interpreter, something like

    title(['$ latex $'],'interpreter','latex')

[Shah]

Thanks Steven but its not working here. I am using MATLAB 7.9.0.

I wrote legend(['$\hat{\psi}$'],'interpreter','latex') but got a warning: Unable to interpret TeX string '$\hat{\psi}$'interpreterlatex'. Same appear in the legend field.

Answer 5

[Shah]

......... Its done! Actually, the default interpreter in MATLAB for legend is 'tex', I guess. It is not changed from the code line. What I had to do was to right click on the legend in the figure window and then changed the 'interpreter' from 'tex' to 'latex'. This action changed the latex statement in the legend field to Math mode.

Cheers Shah

Answer 6

[Jordan Brel Ngako Kadji]

Once I had this problem, I was writing in German and because the german letter 'ä' was not recognised all the latex commands were ignored.

[Rostislav Lebedev]

Try this

title('Verkehrstr\"ager', 'Interpreter', 'latex');

Answer 7

[Richard Ulbricht]

Put this in front of your plotting commands, if you want it for all plots:

set(groot,'defaultLegendInterpreter','latex');