Examples of how to convert a list to a matrix using numpy in python:
Create a list in python
Lets consider for example the following list
l = [4,1,7,3,2]
Note: to check the type of a variable in python we can use the function type():
type(l)
which returns here:
<type 'list'>
Convert a list of numbers to a matrix
To convert a list of numbers to a matrix, as solution is to use the numpy function asarray(): illustration:
import numpy as npA = np.asarray(l)print(A)
gives
array([4, 1, 7, 3, 2])
and
type(A)
gives
<type 'numpy.ndarray'>
Note: to check the length of the input list:
len(l)
returns
5
end the matrix dimensions
A.shape
returns
(5,)
and the matrix type:
A.dtype
returns
dtype('int32')
Convert a list of strings to a matrix
Work also to convert a list of strings to a matrix:
l = ['a','b','c','d','e','f']A = np.asarray(l)print(A)
gives
array(['a', 'b', 'c', 'd', 'e', 'f'],dtype='|S1')
Convert a list of strings to a matrix using numpy.array()
Amother solution using numpy.array()
import numpy as npl = [1,2,3,4]A = np.array(l)
returns
array([1, 2, 3, 4])
