C++ Matrix Class

In C, if I wanted to create a matrix struct, I would use: Then I can allocate it with Now do I do the equiv in C++? EDIT: I want to know the cannonical way to implement a matrix class in C++.

What are the most widely used C++ vector/matrix math/linear algebra libraries, and their cost and benefit tradeoffs?

There are quite a few projects that have settled on the Generic Graphics Toolkit for this. The GMTL in there is nice – it’s quite small, very functional, and been used widely enough to be very reliable. OpenSG, VRJuggler, and other projects have all switched to using this instead of their own hand-rolled vertor/matrix math. I’ve found … Read more

Inverse of a matrix using numpy

The I attribute only exists on matrix objects, not ndarrays. You can use numpy.linalg.inv to invert arrays: Note that the way you’re generating matrices, not all of them will be invertible. You will either need to change the way you’re generating matrices, or skip the ones that aren’t invertible. Also, if you want to go through all 3×3 matrices with elements drawn … Read more

How to get element-wise matrix multiplication (Hadamard product) in numpy?

For elementwise multiplication of matrix objects, you can use numpy.multiply: Result However, you should really use array instead of matrix. matrix objects have all sorts of horrible incompatibilities with regular ndarrays. With ndarrays, you can just use * for elementwise multiplication: If you’re on Python 3.5+, you don’t even lose the ability to perform matrix multiplication with an operator, because @ does matrix multiplication now: