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## [Help-glpk] Specifying a constraint in CPLEX notation

**From**: |
Reginald Beardsley |

**Subject**: |
[Help-glpk] Specifying a constraint in CPLEX notation |

**Date**: |
Wed, 3 Oct 2012 09:55:18 -0700 (PDT) |

I'm doing basis pursuit using glpsol w/ input in CPLEX LP format. This has
worked extremely well, but I decided to modify my problem formulation and have
gotten myself into trouble.
The new problem formulation is:
D[k] = sum(i in m)(A[i] + sum(j in n)( B[i][j]*S[j][k]))
where the A[i] & B[i][j] are unknowns.
I want to constrain A[i] to be zero if all the B[i][j] in n are zero.
A[i] is free
B[i][j] >= 0
m < 10
n < 300
Can I do this in CPLEX LP format or do I need to switch to another notation or
C? Are there any references on doing this?
The closest thing I found was section 20.2 in the AMPL book, but I don't see
how to apply that to my problem. I'm a geoscientist and a long way from home.
So even the obvious can be baffling to me.
Thanks,
Reg

**[Help-glpk] Specifying a constraint in CPLEX notation**,
*Reginald Beardsley* **<=**