MATLAB: How to keep only positive values in an array

digital image processingimage processingoptimization

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?

Best Answer

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

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MATLAB: How to keep gamultiobj goals positive

If you have R2014b or later, use a nonlinear constraint function. Use one nonlinear constraint for each objective function. To save time, after debugging your constraints, you might want to use the technique in Objective and Nonlinear Constraints in the Same Function.

Alan Weiss

MATLAB mathematical toolbox documentation

MATLAB: Combining Matrices

e.g.:

>> Ut = triu(randi(45,6))
Ut =
    32     7     5     4     9    25
     0    38    44    18    12     7
     0     0     1    12     7    39
     0     0     0    37     7    28
     0     0     0     0    40    16
     0     0     0     0     0    24
>> Lt = tril(randi(45,6))
Lt =
    19     0     0     0     0     0
     4     3     0     0     0     0
    11    41    17     0     0     0
     6    43     6     6     0     0
     9    23    36    43    37     0
    11    23    18    44     1    21
>> out1 = Ut + tril(Lt,-1)
out1 =
    32     7     5     4     9    25
     4    38    44    18    12     7
    11    41     1    12     7    39
     6    43     6    37     7    28
     9    23    36    43    40    16
    11    23    18    44     1    24
>> % OR
>> out2 = triu(Ut,1) + Lt
out2 =
    19     7     5     4     9    25
     4     3    44    18    12     7
    11    41    17    12     7    39
     6    43     6     6     7    28
     9    23    36    43    37    16
    11    23    18    44     1    21
>>

Best Answer

Related Solutions

MATLAB: How to keep gamultiobj goals positive

MATLAB: Combining Matrices

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