ERROR: In an assignment A(I) = B, the number of elements in B and I must be the same.

EDIT: Discovered that obj.t should have been expressed as obj.t(obj.i) also. I was under the impression that I could have left that as a vector and the output would have been a vector, but apparently not. Problem solved.

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Hi all,

I'm having some trouble with the above error in a while loop, shown below:

while obj.w(obj.i) < 100

obj.dy(obj.i)=((((obj.Sw(obj.i))^2))^(1/2))*(cos((obj.w(obj.i)*obj.t)+obj.rad));

obj.y = obj.y + obj.dy(obj.i);

obj.i = obj.i + 1;

end

obj.Sw and obj.w are both 1x101 and obj.t is 1x30. Basically, I'm expecting the output to be a single 1x30 vector, representing a turbulence time history.

Can anyone see where I'm going wrong? I've created an identical loop in different programs before and had no previous trouble.

Thanks in advance.

Craig

Answer 1

[Image Analyst]

Use .^ and .* instead of ^ and . Otherwise, if you don't put the dots before the operator, you're doing a matrix operation instead of an element by element operation.

[Craig]

I used to have element wise multiplication before I started using the loop structure. I thought that having Sw(i)^2 would treat it as a scalar for each iteration?

Just tried it there regardless, but I still get the same error.