How to make the negative sign in the legend easier to see?

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Daigo on 20 Oct 2021
Commented: Daigo on 21 Oct 2021
I generated the following legend in my plot but the negative sign ('-') is hard to see. I tried several different fonts but it didn't make a big difference. Is there any way to make it look better? For example, I'd like to make the negative sign "longer" and also get some space between "=" sign and the numbers.
The corresponding part of my code looks like this:
for idx = 1:length(sigma_d_list)
sigma_d = sigma_d_list(idx)
plot(x, y); hold on;
Legends{idx} = strcat('\delta_{d} = ', ' ', num2str(sigma_d*1e3), ' mm');
xlabel('u (m)'); ylabel('PSF');
xlim([-0.5 0.5]*1e-4);
lgnd = legend(Legends);
set(lgnd, 'FontSize', 14);
set(lgnd, 'FontName', 'Times New Roman');

Accepted Answer

Jan on 20 Oct 2021
Edited: Jan on 20 Oct 2021
strcat removes interior spaces. This is not useful here and it is not in general. I consider this as a design error.
Use cat instead:
Legends{idx} = cat(2, '\delta_{d} = ', ' ', num2str(sigma_d*1e3), ' mm');
% or
Legends{idx} = ['\delta_{d} = ', ' ', num2str(sigma_d*1e3), ' mm'];
Do you really want 3 spaces? Or was this a try to struggle with the smart deblanking of strcat?
I'm not a fan of num2str also, which calls sprintf internally. Just call it directly:
Legends{idx} = sprintf('\\delta_{d} = %g mm', sigma_d * 1e3);
Nicer, faster and less confusing.
Daigo on 21 Oct 2021
@Bruno Luong Aha, you can set such a fine-grained font format! Thanks for your tip!

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More Answers (1)

Benjamin on 20 Oct 2021
You can get some more space by using cell arrays in strcat (because strcat trims white space off the ends of character arrays):
Legends{idx} = strcat({'\delta_{d} = '}, {' '}, num2str(sigma_d*1e3), ' mm');





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