savetxt How change the type from float64 to int or double

Question

I have been trying to use the savetxt function in numpy. The problem I am running into is that even thought I define my variables accordingly, i.e. int() or double(), the text file i am getting out has floats in them. How can I change that?

Input is as follows: pNoise=[int(i), around(pNoise[0], decimals=3), around(pNoise[1], decimals=3), around(pNoise[2], decimals=3)]

savetxt line is as follows: savetxt(noutF, pNoisetot)

What I expect is: 0 1.567 8.865 instead I get 0.000000000000000000e+00 1.015909999999999940e+02 2.600000000000000089e-01

Answer 1

You can define how the output has to be formatted with the fmt parameter of np.savetxt, e.g.:

• for floats rounded to five decimals:

    np.savetxt("file.txt", output, fmt='%10.5f', delimiter='\t')
  

• for integers:

    np.savetxt("file.txt", output, fmt='%i', delimiter='\t')
  

Here you can find more information about the possibilities of fmt:

http://docs.scipy.org/doc/numpy/reference/generated/numpy.savetxt.html

Answer 2

In case you want to specify the number of decimals in the float the

np.savetxt("file.txt", output, fmt='%10.5f', delimiter='\t')

7 decimals in this case

np.savetxt("file.txt", output, fmt='%10.7f', delimiter='\t')

Basically, fmt = %10.Yf' where Y specifies the number of decs.