[Clp] any update existing row/col method in ClpSimplex? Like setRow().

[John Forrest]

There is modifyCoefficient which can add elements - that may be too 
fine-grained.

Modifying rows one at a time can be expensive - see a discussion on 
adding rows a few days ago.

If you just want to do one at a time, it would be trivial to write a 
replaceRow/Column (one exist - but just for replacing existing 
elements).  I would suggest writing your own replaceRow (using 
modifyCoefficient).  If you are prepared to do that much work, then I am 
prepared to do a proper replaceRow :-)

John Forrest

On 19/06/15 08:16, Emerson wrote:
> Hi,
> I'm wondering if Clp has a method that can update existing row/column 
> elements? Like glp_set_mat_row()? Thanks.
> I can only find setRow() in cuts but not simplex method. It's unusual 
> that Clp doesn't provide a replace method for existing row/col.
> I know I can use "addRow", build from scratch. But what if I 
> resize(numOfRows,numOfCols) to initialize the constraint matrix, and 
> then modify some of them, can I ?
>
> Thanks,
> Emer
>
>
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