Warning: Unable to interpret LaTeX string

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noa
noa on 20 Sep 2012
hi. i want to make a text annotation including this text:
eval(['text1=''\underline{Row #', num2str(j), '}'';'])
annotation('textbox', [a b c d] , 'String', text1, 'VerticalAlignment', 'middle', 'HorizontalAlignment', 'center', 'Color', 'k', 'EdgeColor', 'k', 'BackgroundColor', 'white', 'FontWeight', 'bold', 'FontSize', 15, 'interpreter','latex');
i get an error: Warning: Unable to interpret LaTeX string "\underline{Row #1}"
how can i solve this?
thanks. Noa
  5 Comments
Matt Fig
Matt Fig on 20 Sep 2012
Edited: Matt Fig on 20 Sep 2012
Jan, it should be:
text1 = sprintf('\\underline{Row #%d}', j);
But there is more to it than that. See my answer below.
Jan
Jan on 20 Sep 2012
@noa: And? Did you follow the advice to read "help sprintf" to find out, that a \\ is required to create a \ in the output string? Or do you try that it is my turn to find this out?
@Matt: Thanks.

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Answers (2)

Matt Fig
Matt Fig on 20 Sep 2012
Edited: Matt Fig on 20 Sep 2012
First of all you really should learn to use SPRINTF instead of EVAL. Please look at the help for SPRINTF and do not use EVAL in your code.
J = 5;
text1 = sprintf('$$\\underline{Row\\#\\;%i }$$',J);
text(.5,.5,text1,'interpreter','latex')
Or if J is a floating point number and not an integer:
J = 5.34;
text1 = sprintf('$$\\underline{Row\\#\\;%2.2f }$$',J);
text(.5,.5,text1,'interpreter','latex')

Jan
Jan on 20 Sep 2012
Edited: Jan on 20 Sep 2012
text(0.5, 0.5, '\underline{Hello World}','interp','latex')
I cannot test this currently, but Daniel's answer sounds, like this is not working.
  2 Comments
noa
noa on 20 Sep 2012
??? Subscript indices must either be real positive integers or logicals.
Jan
Jan on 20 Sep 2012
@noa: This happens, when you use "text" as name of a variable:
clear('text');
text(0.5, 0.5, 'hello');
text = 'any string';
text(0.5, 0.5, 'hello');
Solution: do not use names of Matlab functions as variables.

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