Initializing help system before first use

QELEMS

Description
Number of quadratic non-zeros in the objective.
Type
Integer
Topic areas
Problem Information, Quadratic
Notes
1. Xpress ensures that the matrix is symmetric, so off-diagonal elements are counted twice as follows: if i is different from j and you specify a non-zero at (i,j), then the implicit element at (j,i) will also be counted, for a total of 2 non-zeros.
2. If the matrix is in a presolved state, this attribute returns the number of quadratic elements in the presolved matrix. If you require the value for the original matrix then use the ORIGINALQELEMS attribute instead. The PRESOLVESTATE attribute can be used to test if the matrix is presolved or not.See also Working with Presolve.
Set by routines
XPRSchgqobj, XPRSchgmqobj, XPRSloadlp, XPRSloadmip, XPRSloadqp, XPRSloadqcqp, XPRSloadmiqp, XPRSloadmiqcqp, XPRSreadprob.
See also
ORIGINALQELEMS.
Category
Attribute

Parent Topic Problem Attributes

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