How to convert an array of strings to an array of floats in numpy

Question

How to convert    1 1    2 2    3 2     to   1 1  2 2  3 2    in NumPy

User · Answer

If you have  or create  a single string  you can use np fromstring   import numpy as np x     1 1    2 2    3 2   x       join x  x   np fromstring  x  dtype np float  sep         Note  x       join x  transforms the x array to string  1 1  2 2  3 2   If you read a line from a txt file  each line will be already a string

User · Answer

You can use this as well   import numpy as np x np array   1 1    2 2    3 3    x np asfarray x float

User · Answer

Another option might be numpy asarray   import numpy as np a     1 1    2 2    3 2   b   np asarray a  dtype np float64  order  C     For Python 2    print a  type a   type a 0   print b  type b   type b 0     resulting in     1 1    2 2    3 2    lt type  list  gt   lt type  str  gt   1 1 2 2 3 2   lt type  numpy ndarray  gt   lt type  numpy float64  gt

User · Answer

Well  if you re reading the data in as a list  just do np array map float  list of strings    or equivalently  use a list comprehension    In Python 3  you ll need to call list on the map return value if you use map  since map returns an iterator now    However  if it s already a numpy array of strings  there s a better way   Use astype     import numpy as np x   np array   1 1    2 2    3 3    y   x astype np float

[python] How to convert an array of strings to an array of floats in numpy?

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