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# problem.getMQObj

Purpose
Returns the nonzeros in the quadratic objective coefficients matrix for the columns in a given range. To achieve maximum efficiency, problem.getMQObj returns the lower triangular part of this matrix only.
Topic areas
Problem Information, Quadratic, Optimizer
Synopsis
`start, colind, objqcoef = problem.getMQObj(first=0, last=COLS-1)`
Arguments

first: int | First column in the range.
last: int | Last column in the range.

Return value

start: list[int] | Integer array of length last-first+2 containing indices indicating the starting offsets in the colind and objqcoef arrays for each requested column. Column i starts at position start[i] in the colind and objqcoef arrays, and has start[i+1]-start[i] elements in it.
colind: list[int] | Integer array containing the column indices of the nonzero elements in the lower triangular part of Q.
objqcoef: list[float] | Double array containing the nonzero element values.

Further information
1. The objective function is of the form cTx+0.5xTQx. Note that only the upper or lower triangular part of the Q matrix is returned.
2. Arguments first, last may contain either xpress.var objects or integer indices.
Related topics
problem.chgMQObj, problem.chgQObj, problem.getQObj.
Parent Topic Xpress problem object methods

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