Warning: Unable to interpret LaTeX string

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

[noa]

nope, i googled it and that is the answer that it gave... how can i underline?

[Jan]

Btw. Please do you the favour and omit the eval(). Simply type:

text1 = sprintf('\underline{Row #%d}', j);

[noa]

Warning: Invalid escape sequence appears in format string. See help sprintf for valid escape sequences

[Matt Fig]

Jan, it should be:

text1 = sprintf('\\underline{Row #%d}', j);

But there is more to it than that. See my answer below.

[Jan]

@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.

Answer 1

[Matt Fig]

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')

Answer 2

[Jan]

In http://www.mathworks.com/matlabcentral/answers/28189 you find

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.

[noa]

??? Subscript indices must either be real positive integers or logicals.

[Jan]

@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.