mesh size change in patternsearch

I have a problem in using patternsearch. I want to search with big meshsize in initial steps, but the functions passes them without any function evaluation. Below you can see the results of running of the program:

Iter f-count f(x) MeshSize Method

    0        1         890000          1000
    1        1         890000           500     Refine Mesh
    2        1         890000           250     Refine Mesh
    3        1         890000           125     Refine Mesh
    4        1         890000          62.5     Refine Mesh
    5        1         890000         31.25     Refine Mesh
    6        1         890000         15.62     Refine Mesh
    7        1         890000         7.812     Refine Mesh
    8        1         890000         3.906     Refine Mesh
    9        1         890000         1.953     Refine Mesh
   10        1         890000        0.9766     Refine Mesh
   11        2         890000        0.4883     Refine Mesh
   12       27         890000        0.2441     Refine Mesh
   13       53         890000        0.1221     Refine Mesh
   14       79         890000       0.06104     Refine Mesh
   15      105         890000       0.03052     Refine Mesh

You can see that in the first 10 iteration no function evaluation happened. Do you have any idea?

Answer 1

[Rakesh Kumar]

The trial points are probably infeasible with that big mesh size; hence no function evaluation.

Answer 2

[Laura Proctor]

You can customize many of the options in patternsearch using psoptimset.