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problem.addrows

Purpose
Adds rows and their coefficient to the problem.
Synopsis
problem.addrows(rowtype, rhs, start, colind, rowcoef, range=None, names=None, unlinked=False)
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 
Array containing the right hand side elements.
start 
Array containing the offsets in the colind and rowcoef arrays of the start of the elements for each row. The array must contain one more element than the number of rows to add, with the last element being the total number of coefficients across all rows.
colind 
Array containing the (contiguous) columns (i.e. xpress.varobjects, indices, or names) for the elements in each row.
rowcoef 
Array containing the (contiguous) element coefficients.
range 
(optional) Array containing the row range elements. The values in the range array will only be read for 'R' type rows. The entries for other type rows will be ignored.
names 
(optional) Array of names to be assigned to each new row.
unlinked 
(optional) If True, unlinked constraints will be created (deprecated).
Example
Suppose the current problem is:

maximize: 2x + y + 3z
subject to: x + 4y + 2z ≤ 24
y + z ≤ 5
3x + y ≤ 20
x + y + 3z ≤ 9

Then the following adds the row 8x + 9y + 10z ≤ 25 to the problem and names it NewRow: 
p = xpress.problem()
p.addrows(['L'], [25], [0,3], [0,1,2],
           rowcoef=[8, 9, 10], range=None, names=['NewRow'])
Further information
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.
Related topics
problem.addcols, problem.addcuts.

Parent Topic Xpress problem methods

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