direct product for matrices

[yueyinqiu]

Hello! Sorry for asking a question here, but I'm new to AngouriMath and I cannot find an implemention of direct product for matrices. So perhaps it would be a feature request.

Actually I'm not sure about the name 'direct product' because I learned it from a physics textbook rather than a mathematical one. So I have made a possible implemention:

static Entity.Matrix DirectProduct(Entity.Matrix left, Entity.Matrix right)
{
    return MathS.Matrix(
        left.RowCount * right.RowCount,
        left.ColumnCount * right.ColumnCount,
        (i, j) =>
        {
            var (iLeft, iRight) = Math.DivRem(i, right.RowCount);
            var (jLeft, jRight) = Math.DivRem(j, right.ColumnCount);
            return left[iLeft, jLeft] * right[iRight, jRight];
        });
}

Well I could just use the previous code but it will be nice if I can directly get it from AngouriMath.

[yueyinqiu]

Oh I have finally found TensorProduct through the implemention of TensorPower.

But... why it's a static method? There seems to be no other methods like that. Perhaps the static keyword is mis-added?

[WhiteBlackGoose]

This one? Shouldn't be static

[yueyinqiu]

@WhiteBlackGoose Thanks for your comment.

Actually I mean TensorProduct, but it seems to be a intentional design, so I closed this. #384

By the way, are there any news about tensors? Or it is completely considered as not planned? #152

[WhiteBlackGoose]

Tensors used to be part of AM, but I think now it's only matrices.