problem.getcpcutlist
problem.getcpcutlist |
Purpose
Returns a list of cut indices from the cut pool.
Synopsis
ncuts = problem.getcpcutlist (itype, interp, delta, size, cutind, viol)
Arguments
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itype
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The user defined type of the cuts to be returned.
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interp
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Way in which the cut type is interpreted:
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delta
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Only those cuts with a signed violation greater than delta will be returned.
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size
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Maximum number of cuts to be returned.
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mcutind
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Array of length
size where the cuts will be returned.
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dviol
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Array of length
size where the values of the signed violations of the cuts will be returned.
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Further information
1. The violated cuts can be obtained by setting the
delta parameter to the size of the (signed) violation required. If unviolated cuts are required as well,
delta may be set to
_MINUSINFINITY which is defined in the library header file.
2. If the number of active cuts is greater than
size, only
size cuts will be returned. Otherwise only the existing cuts will be used to fill in the positions of
mcutind.
3. In case of a cut of type '
L', the violation equals the negative of the slack associated with the row of the cut. In case of a cut of type '
G', the violation equals the slack associated with the row of the cut. For cuts of type '
E', the violation equals the absolute value of the slack.
4. Please note that the violations returned are absolute violations, while feasibility is checked by the Optimizer in the scaled problem.
Related topics
problem.delcpcuts,
problem.getcpcuts,
problem.getcutlist,
problem.loadcuts,
problem.getcutmap,
problem.getcutslack, Section "Working with the cut manager" of the Xpress Optimizer reference manual.