Member Avatar for chebude

I want to read a file and convert the columns to rows.


A 1 2 3 4 5 6 7 8 9 10
B 11 12 13 14 15 16 17 18 19 20
C 21 22 23 24 25 26 27 28 29 30

want them to be like this:
A B C
1 11 21
2 12 22
3 13 23
4 14 24
5 15 25


I tried this but does not work

for J in range (0, 6):
        
        RR2 = (fields[J].rstrip())
        print >>ofh, RR2

please your help is need

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  • Latest Post Latest Post by BearofNH
Member Avatar for BearofNH

The jargon for this is "transpose a matrix".

I did this interactively (pay careful attention to the brackets):

>>> import numpy
>>> M = numpy.matrix([['A', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10'],
... ['B', '11', '12', '13', '14', '15', '16', '17', '18', '19', '20'],
... ['C', '21', '22', '23', '24', '25', '26', '27', '28', '29', '30']])
>>> M
matrix([['A', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10'],
        ['B', '11', '12', '13', '14', '15', '16', '17', '18', '19', '20'],
        ['C', '21', '22', '23', '24', '25', '26', '27', '28', '29', '30']],
       dtype='|S2')
>>> Mt = M.transpose()
>>> Mt
matrix([['A', 'B', 'C'],
        ['1', '11', '21'],
        ['2', '12', '22'],
        ['3', '13', '23'],
        ['4', '14', '24'],
        ['5', '15', '25'],
        ['6', '16', '26'],
        ['7', '17', '27'],
        ['8', '18', '28'],
        ['9', '19', '29'],
        ['10', '20', '30']],
       dtype='|S2')
>>>

You'll need to rework the input and output, but that's nothing a couple for loops won't fix. Oh, and you may need to download numpy, but it's free and always worth having around.

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