How to write numpy arrays to .txt file, starting at a certain line? numpy version 1.6

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At: How to write numpy arrays to .txt file, starting at a certain line?

People helped me to solve my problem - this works for numpy Version 1.7 or later. Unfortunatelly I have to use the version 1.6 - the follwoing code (thank you @Praveen)

extra_text = 'Answer to life, the universe and everything = 42'
header = '# Filexy\n# time operation1 operation2\n' + extra_text
np.savetxt('example.txt', np.c_[time, operation1, operation2],     
               header=header, fmt='%d', delimiter='\t', comments=''

give me an error with numpy 1.6

numpy.savetxt() got an unexpected keyword argument 'header' · Issue ...

Is there a work-around for Version 1.6 that produces the same result:

# Filexy
# time operation1 operation2
Answer to life, the universe and everything = 42
0   12  100
60  23  123
120 68  203
180 26  301

Why use a deprecated numpy at all? If it is about administrator privileges, look into pyenv. — Mohammed Li
– Mohammed Li, Commented Sep 14, 2016 at 10:26

Hugues Fontenelle · Accepted Answer · 2016-09-14 10:37:19Z

2

You write your header first, then you dump the data. Note that you'll need to add the # in each line of the header as np.savetxt won't do it.

time = np.array([0,60,120,180])
operation1 = np.array([12,23,68,26])
operation2 = np.array([100,123,203,301])
header='#Filexy\n#time  operation1 operation2'
with open('example.txt', 'w') as f:
    f.write(header)
    np.savetxt(f, np.c_[time, operation1, operation2],
                   fmt='%d',
                   delimiter='\t')

answered Sep 14, 2016 at 10:37

Hugues Fontenelle

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