Dynamic file name with saveas() function

Hi,

I am using matlab into a labview program and I need to save figures. I have a variable which contain the name I want to use to save the file but I can't use this variable into the function:

fileName =  strcat(numberOfBeams, 'RPM vs Volt');
saveas(gcf, [dirfig, fileName, 'png']);

The code gives an error... But it works if don't use the variable

saveas(gcf, [dirfig, 'RPM vs Volt TEST', 'png']);

Thanks a lot for your help !

[Walter Roberson]

What does class(numberOfBeams) and size(numberOfBeams) and class(fileName) indicate ?

What is the error message?

My speculation is that the strcat() is producing a cell array.

[Jean]

I can't use my program in Matlab directly because it needs my labview variables. But numberOfBeams is a String. So I guess fileName is a String too...

[Walter Roberson]

What error message is being produced?

Answer 1

[Image Analyst]

Try this:

folder = dirfig;
baseFileName =  sprintf('%d RPM vs Volt.png', numberOfBeams);
fullFileName = fullfile(folder, baseFileName);
saveas(gcf, fullFileName);

% Or even better:
export_fig(fullFileName);
% http://blogs.mathworks.com/pick/2010/05/28/creating-and-exporting-publication-quality-graphics/