How to keep only positive values in an array?

I have a sorted array with different values: -18 -13 0 8 51 133 255

I only keep the positive values : 0 8 51 133 255

How do i do this?

[per isakson]

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Answer 1

[per isakson]

Given 1D-array, i.e a vector

>> A = [ -18 -13 0 8 51 133 255]
A =
   -18   -13     0     8    51   133   255
>> B = A( A>=0 )
B =
     0     8    51   133   255
>>

and read Matrix Indexing