ToolPythonBeginner MRI k-space reconstruction with numpy.fft: shifts, fold-over, ringing center = np.unravel_index(np.abs(kspace).argmax(), kspace.shape)
ToolPythonIntermediate Zernike polynomials in NumPy: a telescope's wavefront and Strehl ratio i, k = np.unravel_index(off.argmax(), off.shape)