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I have a matrix containing string, float and int numbers and i want to save it as a csv file. This is the command that i use:

numpy.savetxt("X.csv", X, delimiter=",")

Where X is name of the matrix. This is error:

Traceback (most recent call last):


File "<stdin>", line 1, in <module>
 File "/usr/lib/python2.7/dist-packages/numpy/lib/npyio.py", line 1073, in savetxt
fh.write(asbytes(format % tuple(row) + newline))
TypeError: float argument required, not str

This is the first row of matrix:

16  disk    11  10.29   4.63    30.22 11  20.49   60.60   20.22 11  22.17   0.71    10.37

and type of matrix is numpy.ndarray.

How can i save it? Thanks

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  • Tell us more about X (dtype for example). Have you explored the fmt parameter for savetxt? Commented Oct 25, 2015 at 19:52
  • Can you include an example of that this matrix contains? I just did X = np.matrix( np.random.uniform( 0,1, (4,4)) ); np.savetxt("X.csv", X, delimiter=",") and it works just fine. Commented Oct 25, 2015 at 19:53
  • @hpaulj Could u please explain how i should use fmt in this case? Commented Oct 25, 2015 at 20:01
  • I edited the question Commented Oct 25, 2015 at 20:04
  • How would you format your row sample? %s, %s, %d, %f,etc'%(row)`? Commented Oct 25, 2015 at 21:06

1 Answer 1

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In the example you give, the matrix is composed of strings as well as floats. Then this question has already been answered here:

How to use python numpy.savetxt to write strings and float number to an ASCII file?

Edit your np.savetxt call to be numpy.savetxt("X.csv", X, delimiter=",", fmt='%s')

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The '%s' fmt says - convert each column to its usual string representation.

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