Initializing help system before first use

problem.getcols

Purpose
Returns the nonzeros in the constraint matrix for the columns in a given range.
Synopsis
problem.getcols (start, rowind, rowcoef, maxcoefs, first, last)
Arguments
start 
Array which will be filled with the indices indicating the starting offsets in the rowind and rowcoef arrays for each requested column. It must be of length at least last-first+2. Column i starts at position start[i] in the rowind and rowcoef arrays, and has start[i+1]-start[i] elements in it. May be None if not required, but must be specified.
rowind 
Array of length maxcoefs which will be filled with the rows of the nonzero coefficents for each column. May be None if not required, but must be specified.
rowcoef 
Array of length maxcoefs which will be filled with the nonzero coefficient values. May be None if not required, but must be specified.
maxcoefs 
The size of the rowind and rowcoef arrays. This is the maximum number of nonzero coefficients that the Optimizer is allowed to return.
first 
First column in the range.
last 
Last column in the range.
Example
The following examples retrieves the start vector of the problem: 
p = xpress.problem()
p.read("example", "l")
start = []
p.getcols(start, rowind=None, rowcoef=None, maxcoefs=100, first=0, last=p.attributes.cols - 1)
Further information
It is possible to obtain just the number of elements in the range of columns by replacing start, rowind and rowcoef by None, as in the example. In this case, maxcoefs must be set to 0 to indicate that the length of arrays passed is zero. This is demonstrated in the example above.
Related topics
problem.getrows.

Parent Topic Xpress problem methods

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