8.6.11. MConstr¶

class MConstr¶

A multidimensional array consisting of constraints. Returned by Model.addConstr or Model.addMConstr .

Properties

`ndim`	Number of MConstr dimensions
`shape`	Shape of the MConstr
`size`	Number of constraints contained in the MConstr

Methods

`getAttr()`	Obtain the value of the associated attribute
`item()`	Get the unique constraint contained in the current MConstr
`setAttr()`	Set the value of the associated attribute
`tolist()`	Return an array containing all constraints in the current MConstr

getAttr(attrname)¶

Obtain the value of the associated attribute.

Parameters: attrname – The name of the attribute to obtain the value.

example:

m = Model()
mat = m.addMVar((2, 2))
c = m.addMConstr([[1, 2], [3, 4]], mat[0], '<', [1, 2])
c.constrname = ["c0", "c1"]
print(c.constrname)
print(c.getAttr(MDO.Attr.ConstrName))

Note

Attribute can also be read and written directly through object attributes, in this case, the attribute name is case-insensitive

item()¶

Get the unique constraint contained in the current MConstr.

example:

mat = m.addMVar((2, 2))
c = m.addMConstr([[1, 2], [3, 4]], mat[0], '<', [1, 2])
first = c[0]
print(type(first))
print(type(first.item()))

Note

An exception is thrown if the current MConstr contains more than one constraint.

setAttr(attrname, attrvalues)¶

Set the value of the associated attribute.

Parameters

attrname – The name of the attribute to be set.
attrvalues – The new value of the attribute to be set. Can be scalar or array

example:

m = Model()
mat = m.addMVar((2, 2))
c = m.addMConstr([[1, 2], [3, 4]], mat[0], '<', [1, 2])
c.constrname = ["c0", "c1"]
c.setAttr(MDO.Attr.RHS, 5.0)

Note

Attribute can also be read and written directly through object attributes, in this case, the attribute name is case-insensitive

tolist()¶

Return an array containing all constraints in the current MConstr.

example:

mat = m.addMVar((2, 2))
c = self.m.addMConstr([[1, 2], [3, 4]], mat[0], '<', [1, 2])
print(c.tolist())