What is happening to my in-line complex transpose

I've noticed a strange behavior in some matlab code and would like to know what is happening.

I have a large valued complex array (a) and small valued complex array (b). At one point in the code the operation a' * b occurs. This is done in a loop and I wanted to move the complex transpose outside the loop.

e.g.

aTrans = a';
for
  aTrans * b;
end

However, this produces a different result than a' * b (although very small difference) and the in-line transpose is actually faster.

Why?

[Vitali Avagyan]

HI Jeff, can we see your complex arrays?

[Jeff]

These test values show the result on my PC running 2013a

bigArray = complex(rand(10000, 90) .* 80 + 40, rand(10000, 90) .* 80 + 40); arrayTwo = complex(rand(10000, 1).* .001 + .0001, rand(10000, 1).* .001 + .0001);

[Geoff Hayes]

Jeff - can we see all of your code rather than the incomplete portion from above? What is happening in the for loop?