Cannot create disjunction of matrix constraints

[bremner]

I'm not sure if this is a documentation bug (i.e. it might just not be possible), or a bug in pyscipopt, but trying to add a disjunction constraint of two matrix constraints reports

AttributeError: 'MatrixConstraint' object has no attribute '_lhs'

I guess even if it is not intended to be supported, letting it fall through to a Python error is not ideal.

To Reproduce

Run python on the following script

from pyscipopt import Model, quicksum
import numpy as np
scip = Model()

n=5
shape=(n,1)
x = scip.addMatrixVar(shape, vtype='C', name='x', ub=8)

A1 = np.random.rand(2,5)
A2 = np.random.rand(2,5)

z2 = np.c_[[0,0]]

c1=scip.addMatrixCons(A1 @ x == z2, enforce=False)
c2=scip.addMatrixCons(A2 @ x == z2, enforce=False)

scip.addConsDisjunction([c1,c2])

Expected behavior

Disjunctive Constraint added to model.
System

• OS: linux
• Version 5.6.0
• SCIP version 9.2.1
• How did you install pyscipopt? from A debian package that I made.

[Joao-Dionisio]

Hey @bremner! I don't see why this shouldn't be possible. Do you think you can create a small PR to add this change?

It should be almost identical to addMatrixConsIndicator. I can help out, if needed :)

Also, do you mind giving details about the debian package you mention?