Out of memory while executing large matrix sizes

I am developing some MOM codes which requires to build big matrices of teh order of 10000 x 10000 depending on structure being meshed into small cells

Whenevr i exceed size of 5000x5000 i get out of memory although i am having 8GB RAM in my system. Can anybody suggest a solution for it, I am in a real mess as not able to complete my assignment

Answer 1

[Geoff]

Type the following into the command window

memory

The output from mine is as follows:

Maximum possible array:              10511 MB (1.102e+010 bytes) *
Memory available for all arrays:     10511 MB (1.102e+010 bytes) *
Memory used by MATLAB:                 968 MB (1.015e+009 bytes)
Physical Memory (RAM):                8167 MB (8.564e+009 bytes)

*  Limited by System Memory (physical + swap file) available.

Are you running a 64-bit operating system with the 64-bit edition of MatLab installed?

A 10000x10000 matrix of doubles requires about 800MB memory. If you're getting out-of-memory problems, it could be that the processing you are doing on those matrices requires considerably more memory.

Start by clearing all variables:

clear

And only load in the data required for the operation. Sometimes you get this problem when returning a large amount of data from a function call because you haven't cleared the previous result first.

Answer 2

[the cyclist]

This document

http://www.mathworks.com/support/tech-notes/1100/1107.html

has a lot of useful info about use of memory.