pygsti.baseobjs.opcalc.slowopcalc.compact_deriv

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pygsti.baseobjs.opcalc.slowopcalc.compact_deriv#

compact_deriv(vtape, ctape, wrt_params)#

Take the derivative of one or more compact Polynomials with respect to one or more variables/parameters.

Parameters:

  • vtape (numpy.ndarray) – Specifies “variable” and “coefficient” 1D numpy arrays to differentiate. These “tapes” can be generated by concatenating the tapes of individual complact-polynomial tuples returned by Polynomial.compact().

  • ctape (numpy.ndarray) – Specifies “variable” and “coefficient” 1D numpy arrays to differentiate. These “tapes” can be generated by concatenating the tapes of individual complact-polynomial tuples returned by Polynomial.compact().

  • wrt_params (list) – The variable indices to differentiate with respect to. They must be sorted in ascending order. E.g. “[0,3]” means separatey differentiate w.r.t x_0 and x_3 (concatenated first by wrt_param then by poly).

Returns:

vtape, ctape

Return type:

numpy.ndarray

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