ptypy.core.geometry.BasicNearfieldPropagator#

class ptypy.core.geometry.BasicNearfieldPropagator(geo_pars=None, ffttype='scipy', **kwargs)#

Bases: object

Basic two step (i.e. two ffts) Nearfield Propagator.

__init__(geo_pars=None, ffttype='scipy', **kwargs)#
Parameters:

  • geo_pars (Param or dict) – Parameter dictionary as in DEFAULT.

  • ffttype (str or tuple) –

    Type of FFT implementation. One of:

    • ’fftw’ for pyFFTW

    • ’numpy’ for numpy.fft.fft2

    • ’scipy’ for scipy.fft.fft2

    • 2 or 4-tuple of (forward_fft2(),inverse_fft2(), [scaling,inverse_scaling])

Methods

__init__([geo_pars, ffttype])

bw(W)

Computes backward propagated wavefront of input wavefront W.

fw(W)

Computes forward propagated wavefront of input wavefront W.

update([geo_pars])

Update internal p dictionary.
bw(W)#

Computes backward propagated wavefront of input wavefront W.

fw(W)#

Computes forward propagated wavefront of input wavefront W.

update(geo_pars=None, **kwargs)#

Update internal p dictionary. Recompute all internal array buffers.