Requested 250000x250000 (931.3GB) array exceeds maximum array size preference

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I have two vector x1 and x2 each of length 250,000X1 samples that I want to multiply them elementwise as below, but I get the error that array exceeds maximum array size preference. How can I solve this issue?
x1.*x2

Accepted Answer

Voss
Voss on 15 Sep 2022
One of them is a 1x250000 row vector. You can transpose that one, or you can convert it (or both) to column vector(s):
x1(:).*x2(:) % 250000x1
  2 Comments
John D'Errico
John D'Errico on 15 Sep 2022
For example:
x = 1:5;
y = [2 3 5 7 11]';
There, one is a row vector, the other a column vector.
If you just do this:
x.*y
then you get an array, which will overwhelm your memory for your vectors.
As @Voss correctly states (and I upvoted) you can make them both column vectors, using the colon index. Or you can transpose one of them.
My comment is to be careful using transpose if they are complex, since the ' operator is actually the CONJUGATE transpose. If all you want to do is change the shape of the vector from a column to a row, then use the .' operator. It does not perform a conjugate operation too.
x.*y.'
or
x(:).*y(:)
The nice thing about the latter is you know what the result will ALWAYS be: A column vector, of the correct size.

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