Python matrix problems

Question

This is continued from this thread: Python matrix, any solution?

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Input

from numpy import *
import numpy

x=[[\'1\',\'7\'],
 [\'1.5         


        

Answer 1

Convert x to a numpy array of numbers:

x = numpy.asanyarray([[float(z) for z in y] for y in x])

Answer 2

Edit:

It's not 100% clear to me what you're asking/trying to achieve here. In response to the comment about having [['1','7'] ...]: Currently you have string elements in your list; you can easily enough convert to numeric elements with:

xf = [[float(el) for el in m] for m in x]

Original post: Define your list by putting commas between your list elements:

x=[['1','7'],['1.5', '8'],['2', '5.5'],['2','9']]

When I didn't do this, I got your error, but by doing this I avoided the error.

Answer 3

You are missing commas between the inner lists:

x = [['1',   '7'],
     ['1.5', '8'],
     ['2',   '5.5'],
     ['2',   '9']]

The error message stemmed from Python seeing ['1','7']['1.5','8'] and trying to use the tuple ('1.5','8') as an index into the list ['1','7'].