pygsti.tools.matrixtools.expm_multiply_prep

expm_multiply_prep(a, tol=1.1102230246251565e-16)

Computes “prepared” meta-info about matrix a, to be used in expm_multiply_fast.

This includes a shifted version of a.

Parameters:

• a (numpy.ndarray) – the matrix that will be later exponentiated.

• tol (float, optional) – Tolerance used to within matrix exponentiation routines.

Returns:

A tuple of values to pass to expm_multiply_fast.

Return type:

tuple