How to add an index to graph title, legend, and output image without having to write everywhere the same number

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MOTIVATION: I want that a predefined number be used in the following:
1) generation of a graph,
2) title of the graph,
3) legend of the graph,
4) name of the output file.
EXAMPLE: If I define the index equal to 2 as written in the script below,
INDEX=2;
x = 0:pi/100:2*pi;
y = sin(x-INDEX);
h=plot(x,y);
legend(h,'sin(x-INDEX)',1)
title('TEST INDEX','FontSize',26, 'FontName','Arial', 'FontWeight','bold')
print -dtiff -f1 -r600 OUTPUT_INDEX %or -dbitmap, -djpeg, -dtiff, -depsc
I WISH: that Matlab uses that value to generate the graph (as it already does), but also writes the name everywhere with that index. Thus the expectation is the following:
2) title of the graph: TEST 2 and not TEST INDEX
3) legend of the graph: sin(x-2) and not sin(x-INDEX)
4) name of the output file: OUTPUT_2 and not OUTPUT_INDEX
I wonder if someone could help me how to write these commands correctly.
Thanks for your attention
Emerson

Accepted Answer

Fangjun Jiang
Fangjun Jiang on 15 Dec 2011
what you need is num2str(INDEX) or sprintf()
f=figure(INDEX);
legend(h,sprintf('sin(x-%d)',INDEX),1);
title(['TEST ',num2str(INDEX));
The file name can be specified as ['OUTPUT_',num2str(INDEX)]
  3 Comments
Emerson De Souza
Emerson De Souza on 16 Dec 2011
Thank you again Fangjun,
now it works well.
These command lines will
save a lot of my time.
Wish you a nice evening
Emerson

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