Subscripts in MATLAB Legends

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N/A
N/A 2015-3-13
回答： Muhammad Sarfraz Mirza 2021-10-5
This is a very basic question, and as my code suggests, it should work, but it's not: I want have the variables in these legend keys have subscripts, but when MATLAB displays the graph, they appear as written with the underscore symbol.
legend('e_1/e_{in}','e_2/e_{in}','e_{out}/e_{in}');
Thanks in advance for your help!
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Andrew Newell
Andrew Newell 2015-3-16
Thanks for letting us know the answer. It's good to know there is a workaround.

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采纳的回答

Andrew Newell
Andrew Newell 2015-3-14
编辑：Andrew Newell 2015-3-14
I'm beginning to think you should submit a bug report. However, maybe you'll get more consistent results with
h=legend('$e_1/e_{in}$','$e_2/e_{in}$','$e_{out}/e_{in}$');
set(h,'Interpreter','latex')
Or, for better style,
h=legend('$e_1/e_\mathrm{in}$','$e_2/e_\mathrm{in}$','$e_\mathrm{out}/e_\mathrm{in}$');
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Simone Vollaro
Simone Vollaro 2020-6-24
I know this is old, but since it's the first thing that appeared when I searched about it, here's for future references until they fix it. The bug is still here: in bodeplot/bodemag the LaTex interpreter breaks if 'complex' expressions with subscripts and superscripts are provided in the legend arguments.
%% Attempt with Tex, explicitly set for ease of reading
legend('W_{p1}^{-1}', 'W_{p2}^{-1}', 'W_{p3}^{-1}', 'Interpreter', 'tex')
%% First attempt with LaTex
legend('$W_{p1}^{-1}$', '$W_{p2}^{-1}$', '$W_{p3}^{-1}$', 'Interpreter', 'latex')
%% Second attempt with LaTex, following
% <https://www.mathworks.com/matlabcentral/answers/183015-subscripts-in-matlab-legends#comment_272533>
l = legend('$W_{p1}^{-1}$', '$W_{p2}^{-1}$', '$W_{p3}^{-1}$', 'Interpreter', 'latex')
set(l, 'string',{'$W_{p1}^{-1}$', '$W_{p2}^{-1}$', '$W_{p3}^{-1}$'})
%It seems that there's no need for line 35, since the assignment to l
%actually solves the problem and shows the correct legend
%But then if the legend contains something more "complex" than only
%subscripts and superscripts, it breaks again
l = legend('1+ $W_{p1}^{-1}$', '$1/W_{p2}^{-1}$', '$1-W_{p3}$', 'Interpreter', 'latex')
Here's what the Techical Support told me:
"This appears to me like a bug, since the same syntax that you used when creating the legend in a standard plot with 3 lines works as expected, while when using bodeplot or bodemag a formatting issue is encountered. I will inform our development team right away so that they can consider to fix this for a future release."

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更多回答（3 个）

Ankush Chakrabarty
Ankush Chakrabarty 2017-12-11
In MATLAB R2016a, the fix seems to be adding a "\_" instead of a "_"
e.g. h = legend('$G\_{\mathrm{a}}$', '$G\_{\mathrm{b}}$'); set(h, 'Interpreter', 'latex');
Muhammad Sarfraz Mirza
TRY this
clc
clear all
a=-360:1:360;
b=sind(a);
c=cosd(a);
plot(a,b)
hold on
plot (a,c)
xlabel('angle in degrees')
ylabel('value of funtion')
title('sin and cos curve')
legend('sin curve','cos curve')
hold off
Image Analyst
Image Analyst 2015-3-14
>> doc interpreter
Also, backslash is a special character that sometimes modifies what comes after it, so it's not surprising you get unexpected behavior if you don't know that.
  2 个评论
N/A
N/A 2015-3-14
Nope, not working. The legend still reads "e_out..." and so forth.
N/A
N/A 2015-3-14
Here's what I'm faced with now: It will properly do the subscripts, but at any random run of the script. I just did it now, and it worked. Ran the same thing two seconds later...back to not working.

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