interp_nDgrid.py 文件源码

def interpolate(p, axis_values, pixelgrid, order=1, mode='constant', cval=0.0):
    """
    Interpolates in a grid prepared by create_pixeltypegrid().

    p is an array of parameter arrays

    @param p: Npar x Ninterpolate array
    @type p: array
    @return: Ndata x Ninterpolate array
    @rtype: array
    """
    # convert requested parameter combination into a coordinate
    p_ = np.array([np.searchsorted(av_,val) for av_, val in zip(axis_values,p)])
    lowervals_stepsize = np.array([[av_[p__-1], av_[p__]-av_[p__-1]] \
                         for av_, p__ in zip(axis_values,p_)])
    p_coord = (p-lowervals_stepsize[:,0])/lowervals_stepsize[:,1] + p_-1

    # interpolate
    if order > 1:
        prefilter = False
    else:
        prefilter = False

    return [ndimage.map_coordinates(pixelgrid[...,i],p_coord, order=order,
                                    prefilter=prefilter, mode=mode, cval=cval) \
                for i in range(np.shape(pixelgrid)[-1])]