Convert ndarray from float64 to integer

Question

I ve got an ndarray in python with a dtype of float64  I d like to convert the array to be an array of integers  How should I do this   int   won t work  as it says it can t convert it to a scalar  Changing the dtype field itself obviously doesn t work  as the actual bytes haven t changed  I can t seem to find anything on Google or in the documentation - what s the best way to do this

User · Accepted Answer

Use  astype    gt  gt  gt  a   numpy array  1  2  3  4   dtype numpy float64   gt  gt  gt  a array   1    2    3    4     gt  gt  gt  a astype numpy int64  array  1  2  3  4     See the documentation for more options

User · Answer

While astype is probably the  best  option there are several other ways to convert it to an integer array  I m using this arr in the following examples    gt  gt  gt  import numpy as np  gt  gt  gt  arr   np array  1 2 3 4   dtype float   gt  gt  gt  arr array   1    2    3    4      The int  functions from NumPy   gt  gt  gt  np int64 arr  array  1  2  3  4     gt  gt  gt  np int  arr  array  1  2  3  4     The NumPy  array functions themselves    gt  gt  gt  np array arr  dtype int  array  1  2  3  4     gt  gt  gt  np asarray arr  dtype int  array  1  2  3  4     gt  gt  gt  np asanyarray arr  dtype int  array  1  2  3  4     The astype method  that was already mentioned but for completeness sake     gt  gt  gt  arr astype int  array  1  2  3  4     Note that passing int as dtype to astype or array will default to a default integer type that depends on your platform  For example on Windows it will be int32  on 64bit Linux with 64bit Python it s int64  If you need a specific integer type and want to avoid the platform  ambiguity  you should use the corresponding NumPy types like np int32 or np int64

User · Answer

There s also a really useful discussion about converting the array in place  In-place type conversion of a NumPy array   If you re concerned about copying your array  which is whatastype   does  definitely check out the link

[python] Convert ndarray from float64 to integer

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