How to troubleshoot Out of memory Error for this simple case ?

When I write these codes:

>> x=randn(1,20000000);

>> y=x;

>> z=[x y];

>> w=[x y];

after writing w=[x y]; this errors appears:

Error using horzcat

Out of memory. Type HELP MEMORY for your options.

This is the output of Memory Command:

Maximum possible array: 261 MB (2.739e+08 bytes) *

Memory available for all arrays: 935 MB (9.801e+08 bytes)

Memory used by MATLAB: 816 MB (8.559e+08 bytes)

Physical Memory (RAM): 3063 MB (3.211e+09 bytes)

How can I solve the issue?

Answer 1

[Sean de Wolski]

http://www.mathworks.com/help/releases/R2013b/matlab/matlab_prog/resolving-out-of-memory-errors.html