How can I define a matrix that exceeds maximum array size?

I try to solve a nonlinear optimization problem using fmincon. the initial value x0 is a 467856 by 1 vector. when calling fmincon I have got this error

Error using zeros

Requested 467856x467856 (1630.9GB) array exceeds maximum array size preference.

when I typed 'memory' in the workspace, it showed the following information

Maximum possible array: 11812 MB (1.239e+10 bytes) *

Memory available for all arrays: 11812 MB (1.239e+10 bytes) *

Memory used by MATLAB: 1703 MB (1.785e+09 bytes)

Physical Memory (RAM): 16223 MB (1.701e+10 bytes)

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

Is there any help?