MATLAB: How to make a matrix compose by seperate optimization variables

matrix of optimization variablesOptimization Toolboxoptimization variable reference

Hi everyone,
I am thinking if it possible to put several optimizaiton variables into a matrix form. My optimization variable is defined by this syntax: 
>> z1=optimvar('z1','Type','integer','LowerBound',0,'UpperBound',1)
>> z2=optimvar('z2','Type','integer','LowerBound',0,'UpperBound',1)
>> z3=optimvar('z3','Type','integer','LowerBound',0,'UpperBound',1)
zij=['z1','z2','z3';'z2','z2','z3';'z3','z3','z3']
It turns out that my 'zij' is a set of arrays not matrix. Anyone has idea about that? Thanks so much!

Best Answer

This works fine, once you remove the quotes
>> zij=[z1,z2,z3; z2,z2,z3;  z3,z3,z3];
>> showexpr(zij)
(1, 1)
  z1
(2, 1)
  z2
(3, 1)
  z3
(1, 2)
  z2
(2, 2)
  z2
(3, 2)
  z3
(1, 3)
  z3
(2, 3)
  z3
(3, 3)
  z3
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