How do I insert a variable text string in matlab plot?

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Vikash Pandey 2018-11-13

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编辑： madhan ravi 2018-11-14

采纳的回答： madhan ravi

在 MATLAB Online 中打开

Part of my code is

d_close = 3*(r1_eq + r2_eq)
figure(101);
h1 = plot(normalized_time, r1_us, 'b-', normalized_time, r2_us, 'k:');
set(h1,'linewidth',2);
txt = ['d = ', num2str(d_close)];
% t = text(0.0025, 17, txt);
t.FontSize = 24;
legend(['Bubble-1'], ['Bubble-2'])

and so on...

I wish to put sort of additional "third" legend for a plot that has two curves (r1_us and r2_us versus normalized time) only. So, I had to opt for string-method to put the additional information on the plot. But when I run the code, I get the error

Unable to perform assignment because dot indexing is not supported for variables of this type.

Error in bubble_mettin_solver (line 25)

t.FontSize = 24;

So how do I fix this? Please help. I wish that every time the plot shows up it has the information of updated d_close value.

By the way can I have a third legend in which there are only two curves? I know how to implement variable legend, but not the text.

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Vikash Pandey 2018-11-13

在 MATLAB Online 中打开

The actual code is this:

clc;
clear all;
%close all;
time_range = [0 0.6d-4];
r1_eq = 10d-6;
r2_eq = 10d-6;
f_s = 20000;
initial_conditions = [r1_eq 0.d0 r2_eq 0.d0];
[t, r] = ode45('bubble_mettin', time_range, initial_conditions);
r1_us=1000000*r(:,1);
r1dot=r(:,2);
r2_us=1000000*r(:,3);
r2dot=r(:,4);
max_radii_combined = (max(r2_us) + max (r1_us))/1d6
d_close = 3*(r1_eq + r2_eq)
d_far = 300*(r1_eq + r2_eq)
diff_close_safe_positive = d_close - max_radii_combined
diff_far_safe_positive = d_far - max_radii_combined
figure(101);
normalized_time = t./(1/f_s);
h1 = plot(normalized_time, r1_us, 'b-', normalized_time, r2_us, 'k:');
set(h1,'linewidth',2);
txt = ['d = ', num2str(d_close)];
% t = text(0.0025, 17, txt);
t.FontSize = 24;
legend(['Bubble-1'], ['Bubble-2'])
legend('Location','Northwest')
set(gca,'xscale','linear','FontSize',26)
set(gca,'yscale','linear','FontSize',26)
set(gca,'XMinorTick','on')
set(gca,'YMinorTick','on')
%xlim([0 1]);
%ylim([0 24]);
%axis 'auto x'
grid off
xlabel('Normalized time, $t/T_{s}$','interpreter','latex','FontSize',34);
ylabel('Radii, $R_{1,2 \mbox{ }} (\mu m)$','interpreter','latex','FontSize',34)
hold off

Stephen23 2018-11-13

Get rid of these square breckets:

legend(['Bubble-1'], ['Bubble-2'])

They do nothing useful whatsoever:

https://www.mathworks.com/matlabcentral/answers/35676-why-not-use-square-brackets

Vikash Pandey 2018-11-13

Agreed. removed but currently I am facing another issue.

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采纳的回答

madhan ravi 2018-11-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/429596-how-do-i-insert-a-variable-text-string-in-matlab-plot#answer_346705

编辑：madhan ravi 2018-11-14

在 MATLAB Online 中打开

see https://www.mathworks.com/help/matlab/ref/texlabel.html

t=text(0.2, 21, ['d = ' num2str(d_close)]);
t.FontSize = 34;

Vikash pandey's solution:

txt = text(0.03, 21, ("$d =\mbox{ }$" + d_close*1d6 + "$\mu m$"),'Interpreter','latex');
txt.FontSize = 28;

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Vikash Pandey 2018-11-14

Madhan. I found the solution to the problem from a user in Stackoverflow. The solution is:

txt = text(0.03, 21, ("$d =\mbox{ }$" + d_close*1d6 + "$\mu m$"),'Interpreter','latex');

txt.FontSize = 28;

madhan ravi 2018-11-14

wow that's cool!

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更多回答（2 个）

Jan 2018-11-13

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/429596-how-do-i-insert-a-variable-text-string-in-matlab-plot#answer_346706

在 MATLAB Online 中打开

Start with omitting the clear all, because this is a waste of time only. The error message is clear: Your t is the output of ode45() and a double vector. Then you cannot define t.FontSize. In the line before, the t would have been re-defined, but it is commented:

% t = text(0.0025, 17, txt);

Either delete the "%" character there or better use a unique name for the variable:

TestH = text(0.0025, 17, txt);
TextH.FontSize = 24;

It is not clear, what a "third legend" is. There is one legend only and not even a second one. Do you want to get a third entry in this legend? This would be confusing, because readers expect the same number of lines as legend entries. Maybe an additional title helps: https://www.mathworks.com/matlabcentral/answers/324848-setting-a-title-for-a-legend

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Vikash Pandey 2018-11-13

Thanks for the advise. I corrected it. But still a minor issue remains. Please see above.

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Vikash Pandey 2018-11-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/429596-how-do-i-insert-a-variable-text-string-in-matlab-plot#answer_346721

Yes. you see the plot here, mu looks so different than m in the plot. I want them to be latex equally. By the way I have solved the bubble coupled ODE problem that I had posted yesterday. Hope you remember. :)