Accesses a Range of Columns of the Constraint Matrix

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Description

Low level interface function to the IBM ILOG CPLEX function CPXgetcols. Consult the IBM ILOG CPLEX documentation for more detailed information.

Usage

1
  getColsCPLEX(env, lp, begin, end)

Arguments

env

An object of class "cplexPtr" as returned by openEnvCPLEX. This is basically a pointer to an IBM ILOG CPLEX environment.

lp

An object of class "cplexPtr" as returned by initProbCPLEX. This is basically a pointer to an IBM ILOG CPLEX problem object.

begin

An integer specifying the beginning of the range of columns to be returned.

end

An integer specifying the end of the range of columns to be returned.

Details

Interface to the C function getCols which calls the CPLEX function CPXgetcols.

Value

If successful a list is returned:

matbeg

Array that specifies the nonzero elements of the columns. Consult the IBM ILOG CPLEX documentation for more detailed information.

matind

Array that specifies the nonzero elements of the columns. Consult the IBM ILOG CPLEX documentation for more detailed information.

matval

Array that specifies the nonzero elements of the columns. Consult the IBM ILOG CPLEX documentation for more detailed information.

otherwise an instance of class "cplexError".

Author(s)

Gabriel Gelius-Dietrich <geliudie@uni-duesseldorf.de>

Maintainer: Claus Jonathan Fritzemeier <clausjonathan.fritzemeier@uni-duesseldorf.de>

References

The IBM ILOG CPLEX home page at https://www.ibm.com/developerworks/university/academicinitiative/.

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