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## [Help-glpk] cross product of decision variable on itself.

**From**: |
brad mullins |

**Subject**: |
[Help-glpk] cross product of decision variable on itself. |

**Date**: |
Sat, 25 Feb 2012 12:31:20 -0800 (PST) |

This may make no sense, but trying to create a matrix established by the a
single dimensional decision variable that is the cross product of itself,
eg:
decision variable
1 2 3 1.5
----------- ----------- ----------- -----------
1 | 1 2 3 1.5
2 | 2 4 6 3
3 | 3 6 9 4.5
1.5| 1.5 3 4.5 2.25
Thought about making two sets, maybe something like the following, but cant
get it to work:
set SET1;
set SET2 := SET1 cross SET1;
Also thought about building this into a constraint. something like s.t.
:[x,y] - [x]*[y] =0 .
In the objective statement, the resulting matrix will just be multiplied by
another parameter matrices of the same dimension.
How can this be done?
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**[Help-glpk] cross product of decision variable on itself.**,
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