Initializing help system before first use

problem.getcols

problem.getcols

Purpose
Returns the nonzeros in the constraint matrix for the columns in a given range.
Synopsis
problem.getcols (mstart, mrwind, dmatval, size, first, last)
Arguments
mstart 
Array which will be filled with the indices indicating the starting offsets in the mrwind and dmatval arrays for each requested column. It must be of length at least last-first+2. Column i starts at position mstart[i] in the mrwind and dmatval arrays, and has mstart[i+1]-mstart[i] elements in it. May be None if not required, but must be specified.
mrwind 
Array of length size which will be filled with the rows of the nonzero coefficents for each column. May be None if not required, but must be specified.
dmatval 
Array of length size which will be filled with the nonzero coefficient values. May be None if not required, but must be specified.
size 
The size of the mrwind and dmatval 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 mstart vector of the problem: 
p = xpress.problem()
p.read("example", "l")
mstart = []
p.getcols(mstart, mrwind=None, dmatval=None, size=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 mstart, mrwind and dmatval by None, as in the example. In this case, size 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 Reference Manual

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