pygsti.tools.matrixtools.nullspace_qr

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pygsti.tools.matrixtools.nullspace_qr#

nullspace_qr(m, tol=1e-07)#

Compute the nullspace of a matrix using the QR decomposition.

The QR decomposition is faster but less accurate than the SVD used by nullspace().

Parameters:

  • m (numpy array) – An matrix of shape (M,N) whose nullspace to compute.

  • tol (float , optional) – Nullspace tolerance, used when comparing diagonal values of R with zero.

Return type:

An matrix of shape (M,K) whose columns contain nullspace basis vectors.

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