pygsti.tools.matrixtools.near_identity_matrix_log

near_identity_matrix_log(m, tol=1e-08)

Construct the logarithm of superoperator matrix m that is near the identity.

If m is real, the resulting logarithm will be real.

Parameters:

• m (numpy array) – The superoperator matrix whose logarithm is taken

• tol (float, optional) – The tolerance used when testing for zero imaginary parts.

Returns:

An matrix logM, of the same shape as m, such that m = exp(logM) and logM is real when m is real.

Return type:

numpy array