numpy.savetxt - Save a np.array with different types

Question

This question is connected to others already existing (such as this), but I could not solve by following the solutions provided in there. So I try to ask again.

I have 7 parameters, say a1, a2, b1, b2, b3, b4 and b5. The 'a' parameters are integers, while the 'b' parameters are floats. As an example, take

a1=1, a2=500, b1=1.0, b2=1.0, b3=-0.866025, b4=0.0, b5=-0.1.

I would like to save these parameters into a file. The code for doing this reads:

f = open("params.txt",'w')
arr=np.array((a1,a2,b1,b2,b3,b4,b5))
arrform=' '.join(['%d']*2 + ['%f']*5)
np.savetxt(f,arr,fmt=arrform)
f.close()

When executing this code I get the following error message:

fmt has wrong number of % formats: %d %d %f %f %f %f %f

Could you, please, tell me what is my mistake?

print(arrform%(a1,a2,...), file=f) of f.write(...) should be enough if those variables are scalars. You don't need numpy to format and write a tuple of numbers. — hpaulj
– hpaulj, Commented Nov 30, 2020 at 15:47

user16181 · Accepted Answer · 2020-11-30 13:06:43Z

1

use column_stack instead array

f = open("params.txt",'w')
arr=np.column_stack((a1,a2,b1,b2,b3,b4,b5))
arrform=' '.join(['%d']*2 + ['%f']*5)
np.savetxt(f,arr,fmt=arrform)
f.close()

answered Nov 30, 2020 at 13:06

user16181

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