Originally posted by: fkau

Hi

I'm just trying to formulate some constraints for a model that I'm making any help would be great.

So the problem is a scheduling problem the model functions by selecting different locations.

I am trying enforce a constraint that will ensure that, the locations can only be selected in order, and then only be selected when the lower has been selected already.

Or in other words

given matrix *bold*B*bold*

*bold*B*bold* = [ .5 .4 .3 ...
.2 .1 .6 ...
.6 .3 .5 ...]

b~i j~ cannot be used until b~i j+1~ has been selected
Any thoughts or help are much appreciated \

Cheers
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Originally posted by: ol

Hello,

I assume you mean
b~i j+1~ cannot be used until b~i j~ has been selected
instead of
b~i j~ cannot be used until b~i j+1~ has been selected

let S_{i,j} be the boolean "B_{i,j} is selected".
Your constraint can be expressed by S_{i,j} >= S_{i,j+1}

Regards
ol
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