Is there a generic way using Breeze to achieve what you can do using broadcasting in NumPy?
Specifically, if I have an operator I'd like to apply to two 3x4 matrices, I can apply that operation element-wise. However, what I have is a 3x4 matrix and a 3-element column vector. I'd like a function which produces a 3x4 matrix created from applying the operator to each element of the matrix with the element from the vector for the corresponding row.
So for a division:
2 4 6 / 2 3 = 1 2 3
3 6 9 1 2 3
If this isn't available. I'd be willing to look at implementing it.
You can use mapPairs to achieve what I 'think' you're looking for:
val adder = DenseVector(1, 2, 3, 4)
val result = DenseMatrix.zeros[Int](3, 4).mapPairs({
case ((row, col), value) => {
value + adder(col)
}
})
println(result)
1 2 3 4
1 2 3 4
1 2 3 4
I'm sure you can adapt what you want from simple 'adder' above.