python - MATLAB ind2sub and Numpy unravel_index inconsistency -


based on following answer:

using octave, get:

>> [x, y, z] = ind2sub([27, 5, 58], 3766) x =  13 y =  5 z =  28

using numpy, get:

>>> import numpy np >>> np.unravel_index(3765, (27, 5, 58)) (12, 4, 53)

why, in numpy, z component 58, when should 27 according octave?

well matlab follows column-major indexing, (x,y,z) elements stored @ x, y , z. numpy (x,y,z) because of row-major indexing, it's other way - z, y , x. so, replicate same behavior in numpy, need flip grid shape use np.unravel_index , flip output indices, -

np.unravel_index(3765, (58, 5, 27))[::-1]

sample run -

in [18]: np.unravel_index(3765, (58, 5, 27))[::-1] out[18]: (12, 4, 27)

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