Matmul and dot operation - Githubissues

PyPSA / linopy

Linear optimization with N-D labeled arrays in Python

https://linopy.readthedocs.io

MIT License

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Matmul and dot operation #251

Closed FabianHofmann closed 4 months ago

FabianHofmann commented 4 months ago

New Features

Variables and LinearExpressions now have a new method dot, which allows computing the dot product of two objects. This multiplies objects and sums over common dimensions.
The matmul operator @, which runs the dot operation, is now supported for Variables and LinearExpression.

Bugfixes

The multiplication of two linear expression with non-zero constants led to wrong results of the cross terms. Given the multiplication (v1 + c1) * (v2 + c2) with v being a variable and c a constant, the operation did not calculate the cross terms v1 * c2 + v2 * c1. This is fixed now.

hcoste commented 1 month ago

Hello FabianHofmann, thanks for the feature. Could your provide an example of dot product between a linopy variable (vector) and a constant matrix ? It seems this is not yet possible but I wanted to have your opinion if possible.

KR