NumpyTensorSpace._lincomb

NumpyTensorSpace._lincomb(a, x1, b, x2, out)

Implement the linear combination of x1 and x2.

Compute out = a*x1 + b*x2 using optimized BLAS routines if possible.

This function is part of the subclassing API. Do not call it directly.

Parameters:

a, bTensorSpace.field element

Scalars to multiply x1 and x2 with.

x1, x2NumpyTensor

Summands in the linear combination.

outNumpyTensor

Tensor to which the result is written.

Examples

>>> space = odl.rn(3)
>>> x = space.element([0, 1, 1])
>>> y = space.element([0, 0, 1])
>>> out = space.element()
>>> result = space.lincomb(1, x, 2, y, out)
>>> result
rn(3).element([ 0.,  1.,  3.])
>>> result is out
True