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mir.sparse.blas.axpy

Authors:
Ilya Yaroshenko
void axpy(CR, V1 : CompressedArray!(T1, I1), T1, I1, V2)(in CR alpha, V1 x, V2 y)
if (isDynamicArray!V2 || isSlice!V2 == [1]);
Constant times a vector plus a vector.
Parameters:
V1 x sparse vector
V2 y dense vector
CR alpha scalar
Returns:
y = alpha * x + y
Examples:
auto x = CompressedArray!(double, uint)([1.0, 3, 4, 9, 13], [0, 3, 5, 9, 10]);
auto y = [0.0, 1.0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
axpy(2.0, x, y);
assert(y == [2.0, 1.0, 2, 9, 4, 13, 6, 7, 8, 27, 36, 11, 12]);