problem.chgrhsrange
problem.chgrhsrange |
Purpose
Change the range for one or more rows of the problem.
Synopsis
problem.chgrhsrange(mindex, rng)
Arguments
|
mindex
|
Array containing the rows (i.e.
xpress.constraint objects, indices, or names) on which the range elements will change.
|
|
rng
|
Array containing the range values.
|
Example
Here, the constraint
cons1 x + y ≤ 10 is changed to 8 ≤ x + y ≤ 10:
p.chgrhsrange([cons1], [2])
Further information
If the range specified on the row is
r, what happens depends on the row type and value of
r. It is possible to convert non-range rows using this routine.
| Value of r | Row type | Effect | ||
|---|---|---|---|---|
| r ≥ 0 | = b, ≤ b | b-r ≤ ∑ajxj ≤ b | ||
| r ≥ 0 | ≥ b | b ≤ ∑ajxj ≤ b+r | ||
| r < 0 | = b, ≤ b | b ≤ ∑ajxj ≤ b-r | ||
| r < 0 | ≥ b | b+r ≤ ∑ajxj ≤ b |
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