[Osi] [Clp] set row solution (activities)

[Matthew Galati]

Why not just add a method to ClpModel that sets rowActivity_ and then a
method to OsiClp that sets row solution?



Disgusting solution but you could create a class that inherits from
> clpsimplex, provides functions to set rowactivity (protected) and cast to
> it.
>
>
>
> *From:* clp-bounces at list.coin-or.org [mailto:clp-bounces at list.coin-or.org]
> *On Behalf Of *Matthew Galati
> *Sent:* Thursday, August 13, 2009 5:14 PM
> *To:* Lou Hafer
> *Cc:* osi at list.coin-or.org; clp at list.coin-or.org
> *Subject:* Re: [Clp] [Osi] set row solution (activities)
>
>
>
> I think setRowPrice sets the dual solution - not the (primal) row solution.
>
> Internally, it is the rowActivity_ array that needs to be set - that is
> what is returned by getRowActivity(). That is why you are not seeing it come
> back - you are actually setting the duals with setRowPrice.
>
> I am not sure what it does to internals, but I think all you need is a
> method "setRowSolution" and do a memcpy into rowActivity_.
>
>
>
>
> Matt,
>
>        Osi.setColSolution and Osi.setRowPrice will set the column and row
> solution, respectively.  Row activity should follow from setColSolution.
>
>        Based on the Osi unit test, OsiClp ignores imposed row and column
> solutions (at least, they are not immediately reflected in the results
> returned
> for row activity and reduced costs).
>
>                                                Lou
>
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