Initializing help system before first use

# problem.addRows

Purpose
Adds rows to the optimizer matrix.
Topic areas
Problem Creation, Optimizer
Synopsis
`problem.addRows(rowtype, rhs, rng=None, start=None, colind=None, rowcoef=None)`
Arguments

rowtype | Character array containing the row types:
L | indicates a ≤ row;
G | indicates ≥ row;
E | indicates an = row.
R | indicates a range constraint;
N | indicates a nonbinding constraint.
rhs | Double array containing the right hand side elements.
rng | Double array containing the row range elements. This may be None if there are no ranged constraints. The values in the rng array will only be read for R type rows. The entries for other type rows will be ignored. The lower bound on a range row is the right hand side value minus the range value. The sign of the range value is ignored - the absolute value is used in all cases.
start | Integer array containing the offsets in the colind and rowcoef arrays of the start of the elements for each row. May be None if none of the rows contain nonzero coefficients.
colind | Integer array containing the (contiguous) column indices for the elements in each row. May be None if none of the rows contain nonzero coefficients.
rowcoef | Double array containing the (contiguous) element values. May be None if none of the rows contain nonzero coefficients.

Related controls
Integer

EXTRAELEMS | Number of extra matrix elements to be allowed for.
EXTRAROWS | Number of extra rows to be allowed for.

Double

MATRIXTOL | Tolerance on matrix elements.

Further information
1. Range rows are automatically converted to type L, with an upper bound in the slack. This must be taken into consideration, when retrieving row type, right–hand side values or range information for rows.
2. This function cannot be called while the current problem is being solved or when it is in an interrupted state. Use problem.postSolve to restore the problem to a non-solving state.
3. Argument colind may contain xpress.var objects instead of indices.
Related topics
problem.addCols, problem.addCuts, problem.addNames, problem.delRows.
Parent Topic Methods of the class problem

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