THIS WAS RESOLVED 1. The problem statement, all variables and given/known data In a problem I had to create a animation of the function sin(x-a) were a ranged from 0 to 8pi Code (Text): x=[-2*pi:.00001*pi:2*pi]; a=0; y=sin(x-a); g=plot(x,y); grid on; title('sin(x-0)') set(g,'EraseMode','xor') while a<=8*pi a=a+.1*pi; y=sin(x-a); set(g,'ydata',y) drawnow end My code worked fine and did what it was suppose to do. I however was trying to get MATLAB to change the value of a in the title each time it went through the loop and I seem to be having difficulties doing this. 2. Relevant equations 3. The attempt at a solution Here's my attempt at what I thought would produce what I was looking for. Code (Text): x=[-2*pi:.00001*pi:2*pi]; a=0; y=sin(x-a); g=plot(x,y); grid on; title('sin(x-a)') set(g,'EraseMode','xor') while a<=8*pi a=a+.1*pi; y=sin(x-a); set(g,'ydata',y) drawnow title(fprintf('sin(x-%s)\n',num2str(a))); end I thought this would work. Before it enters the loop the title would get defined as sin(x-0). I thought that it would then redefine the title in this line title(fprintf('sin(x-%f)\n',num2str(a))); were num2str(a) would change a, which is defined as a number, into a string of text that could be placed in the title sin(x-a) That was my logic behind that... I also suppressed the output with the ";" operator I thought that this would produce the results I was looking for but the title just gets changed to some kind of number like 14 or 13 or 15 and just stays like that... oddly enough the title I was expecting to get on my graph some how appears in the command window even though I suppressed the output... I'm hoping someone can explain what I'm doing wrong.