Assigning a value to a vector in a for loop

I'm trying to assign individual times to a vector 'toa' in a loop using:

for jj = 1:nvar

    ktau = jj * tau0;
    toa(jj) = jj * tau0; 
   {buncha calcs}
end

I use ktau in following equations, and I want to keep a vector of all the times used.

When I try to run the function I get: In an assignment A(I) = B, the number of elements in B and I must be the same.

Error in alvarQ (line 115) toa(jj) = jj.*tau0; % this was time calc above

Why is that? Shouldn't that work?

Thanks, Kim

Answer 1

[Image Analyst]

Evidently tau0 is a vector, not a scalar, so the product of jj*tau0 is also a vector. You can't stuff a vector of multiple elements into a single element of toa. Maybe you meant tau0(jj)???? What does "whos ktau" show?

[Image Analyst]

http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/

Answer 2

[Star Strider]

Is ‘tau0’ a vector or a scalar?

Otherwise, your ‘{buncha calcs}’ could be the problem. Are you doing anything to ‘toa’ or ‘tau0’ in them?

Answer 3

[Kim]

Y'all, thanks for the help. Based on what you said I went and looked at tau0. It was supposed to be a scalar. I'd read it out of a file header. However it was stored as text i.e. '9.9998e-6' instead of 9.9998e-6.

Quick use of str2num straightened me out, and things ran fine.

[Star Strider]

Glad you got that sorted out!