problem.getpwlcons
problem.getpwlcons |
Purpose
Returns the piecewise linear constraints
y = f(x) in a given range.
Synopsis
npoints = problem.getpwlcons(col, resultant, start, xval, yval, size, first, last);
Arguments
|
col
|
Integer array which will be filled with the indices of the input variables
x. It must be of length at least
last-first+1. May be
None if not required.
|
|
resultant
|
Integer array which will be filled with the indices of the output variables
y. It must be of length at least
last-first+1. May be
None if not required.
|
|
start
|
Integer array which will be filled with the start indices of the different constraints in the breakpoint arrays. It must be of length at least
last-first+1. The
x-values of the breakpoints of piecewise linear constraint
i < last will be given in
xval[start[i]] to
xval[start[i+1]]. May be
None if not required.
|
|
xval
|
Double array of length
sizewhich will be filled with the
x-values of the breakpoints. May be
None if not required.
|
|
yval
|
Double array of length
sizewhich will be filled with the
y-values of the breakpoints. May be
None if not required.
|
|
size
|
Maximum number of breakpoints to be retrieved.
|
|
first
|
First piecewise linear constraint in the range.
|
|
last
|
Last piecewise linear constraint in the range.
|
|
npoints
|
The returned number of breakpoints in the
xval and
yval arrays. If the number of breakpoints is greater than
size, then only
size elements will be returned.
|
Example
The following example retrieves all variables and breakpoints in the first two piecewise linear constraints:
col, resultant, start, xval, yval = [], [], [], [], [] npoints = prob.getpwlcons(prob, col, resultant, start, xval, yval, 1e9, 0, 1)
Further information
It is possible to obtain just the number of breakpoints in the range of piecewise linear constraints by calling this function with
size set to
0, in which case the required size for the breakpoint arrays will be returned in
npoints.
Related topics