array exceeds maximum array size preference

Hi everyone,

I am trying to run a "for loop" which increase the size of a matrix each iteration.

During one of my iteration i got this error- "Error using zeros

Requested 61263x61263 (28.0GB) array exceeds maximum array size preference. Creation of arrays greater than this limit

may take a long time and cause MATLAB to become unresponsive."

In matlab prefences --> workspace I have already defined the "array size limit" to 100% and it still does not help.

Is there any solution for this prolem besides bigger memory size?

[Rik]

Yes, use smaller array sizes. Do you actually want such enourmous arrays? Or did you multiply a row and a column vector?

a=1:10;
b=a.';
size(a.*b)

ans = 1×2

10 10

[Ron Bartov]

Make the matrix bigger is not really the purpose. I currently study the course of “Transmission Lines” and I need to define a conductor profile as a matrix. Since the conductor shape is continuous I need to divide the length and width of the conductor by small “delta” value for getting it as an array of points matrix). Each dot is an electric potential. In our exercise we have vector that each of its entries is another delta value and we need to build the conductor with all of this value (every time with one value) and see the differences. Some of the deltas are good but for very small delta’s values the number of points are very large and there I get the error. Hope my explanation is clear.

[Rik]

You can't view 360 million points at once, so you could consider cutting up your task in smaller parts that actually fit in memory and return results that you can interpret. This is not enough detail for me to see how you might be able to avoid a loop.

[Ron Bartov]

I will try it. Thank you!

[DGM]

You may also find that a lot of these sorts of field calculations problems in T&D coursework exhibit symmetry that you can exploit to simplify the problem.