How to print some numeric value by using xlabel in subplot?

I have following code:

figure
NC = 0.79 % May be any value returned from some function.
subplot(3,4,);
imshow(extracted_watermark);
xlabel([attack 'NC='+char(NC)]);

Here Xlabel is giving output like this (NC= )

It shuld give output numeric value of NC like this (NC=0.79).

Answer 1

[Image Analyst]

Try this

NC = 0.79 % May be any value returned from some function.
subplot(3,4,1);
imshow(extracted_watermark);
caption = sprintf('NC=%.2f', NC); % Add in attack if you want
xlabel(caption, 'FontSize', 20); % I have no idea what "attack" is.

Answer 2

[dpb]

xlabel(num2str(NC,'NC=%.2f'))

Dunno what "attack" above represents. If it's a char variable and wanted as part of the string, then include as desired in the format string.

See Also

compose, sprintf

and the section on annotation of graphics for many examples...