Also, due to Matlab's explicit matrix expansion (I think that's waht they call it), you can simply use the dimensions to cereate your vectors for the different t values, like this:
x = 1:100;
t = [15;20;25]; % a different dimension from x
y = exp(-0.1*x.*t+x).*x*3.*sin(x); % each row of y is y=f(x) for the corresponding t
plot(y');
Is this what you were after?
