Python convert string matrix to float matrix

Question

I would like to convert the following matrix (string) to float numbers

           0                0                0                0                0
            0                0                0                0       78.2949219
   81.0840607       83.2369537   0.000100000005       101.055199       78.5405502

i used:

import numpy as np
number = []
for line in filename:
    number.append(line)
number = np.array(number)
number_float = number.astype(np.float)

but it gives me: ValueError: could not convert string to float: ' 0 0 0 0 0\n' is that because \n ?

You need to split the line into separate elements for each number. — Barmar
– Barmar, Commented Jan 28, 2020 at 22:05
are you trying to read a fulolile? Perhaps numpy.loadtxt could be useful? — Nathan
– Nathan, Commented Jan 28, 2020 at 22:06

Barmar · Accepted Answer · 2020-01-28 22:32:23Z

1

You don't have a 2-dimensional matrix, you just have a list of strings, with one element for each line. You need to split it into separate numbers.

for line in filename:
    number.append(line.split())

You can also do the float conversion at the same time, and you can build the list using a list comprehension.

number = [[float(cell) for cell in line] for line in filename]

edited Jan 28, 2020 at 22:32

answered Jan 28, 2020 at 22:07

Barmar

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3 Comments

Tomerikoo Over a year ago

I think it is better to use list-comprehension instead of map (or of course, list(map(...))) as map returns a map object and not a list (not sure how np.array handles map objects)

Barmar Over a year ago

@Tomerikoo Always forget that detail about map. I've converted to nested list comprehensions.

Tomerikoo Over a year ago

Sorry to be annoying haha but now you just forgot to split the line

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