how to construct a matrix from lists in Python?

Question

I'm new to Python and my problem is how to construct a matrix from some lists? For example if i have lists:

[388.625, 174.125, 157.25, 166.375]
[432.25, 606.125, 326.25, 202.75]
[383.5, 718.25, 630., 284.]
[487.375, 299.125, 438.125, 432.5]

How can i join them to create a matrix?

There is a nice tutorial on dataframes in Python here: pandas.pydata.org/pandas-docs/dev/10min.html — Stanislav
– Stanislav, Commented Mar 24, 2015 at 3:13
matrix = [[ 0.4691, -0.2829, -1.5091, -1.1356], [ 1.2121, -0.1732, 0.1192, -1.0442], [-0.8618, -2.1046, -0.4949, 1.0718], [ 0.7216, -0.7068, -1.0396, 0.2719], [-0.425 , 0.567 , 0.2762, -1.0874], [-0.6737, 0.1136, -1.4784, 0.525 ]] — Stanislav
– Stanislav, Commented Mar 24, 2015 at 3:14

Alex Martelli · Accepted Answer · 2015-03-24 02:50:57Z

8

Assuming that by "matrix" you mean a 2-D numpy array,

import numpy
matrix = numpy.array(list_of_lists)

will do it, if in list_of_lists you have, guess what!, the list of lists of numbers.

If what you have is, e.g, four separate lists, each of four numbers, named a, b, c and d, making a list of lists out of them isn't really all that hard...:

matrix = numpy.array([a, b, c, d])

and so forth, depending exactly on what you mean by "construct a matrix from some lists"!-)

answered Mar 24, 2015 at 2:50

Alex Martelli

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1 Comment

Akavall Over a year ago

Or numpy.matrix(list_of_lists), since OP said "matrix".

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