only integers slices ellipsis numpy newaxis None and integer or boolean arrays are valid indices

Question

I am implementing fft as part of my homework  My problem lies in the implemention of shuffling data elements using bit reversal  I get the following warning   DeprecationWarning  using a non-integer number instead of an integer will result in an error in the future  data x   data y    data y   data x   And the auto grading system  provided by university  returns the following   error  only integers  slices      ellipsis        numpy newaxis  None  and integer or boolean arrays are valid indices   My code is  def shuffle bit reversed order data  np ndarray  - gt  np ndarray       quot  quot  quot      Shuffle elements of data using bit reversal of list index       Arguments      data  data to be transformed  shape  n    dtype  float64        Return      data  shuffled data array      quot  quot  quot         implement shuffling by reversing index bits      size   data size      half   size 2       for x in range size           xx   np int x          n   np int half           y   0          while n  gt  0              y    n   np mod xx 2              n    2             xx   np int xx  2           if  y  gt  x                data x   data y    data y   data x       return data  I have already implemented the function for fft but it won t work until I get this shuffling function working  I think the problem is my data is of type  float64  and I may have used it as an integer but I don t know how I can solve it

User · Answer

put a int infront of the all the voxelCoord s   Like this below    patch   numpyImage  int voxelCoord 0   int voxelCoord 1  - int voxelWidth 2  int voxelCoord 1   int voxelWidth 2  int voxelCoord 2  -int voxelWidth 2  int voxelCoord 2   int voxelWidth 2

User · Answer

I believe your problem is this  in your while loop  n is divided by 2  but never cast as an integer again  so it becomes a float at some point  It is then added onto y  which is then a float too  and that gives you the warning

User · Answer

You can use    instead of single    That converts to int directly

[python] only integers, slices (`:`), ellipsis (`...`), numpy.newaxis (`None`) and integer or boolean arrays are valid indices

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