How to make a matrix of ones in python
To make an array of ones in the python language you can use the ones() function of the numpy library.
ones(n)
The parameter n indicates the number of elements and the structure of the array (vector, matrix with two or more dimensions).
- n = one-dimensional array
- n,m = two-dimensional array with n rows and columns (matrix)
- n,m,t = three-dimensional array (tensor)
The ones() function creates an array with all elements equal to the real number 1.
Note. By default the function creates floating point elements (float).
Examples
Example 1 (vector)
Create a vector with five elements equal to 1.
>>> import numpy as np
>>> y=np.ones(5)
The ones() function generates the following vector
>>> y
array([1., 1., 1., 1., 1.])
They are floating point float 1 values.
Example 2 (vector with integers)
Use the dtype attribute to define the data type of the array
>>> import numpy as np
>>> y=np.ones(5, dtype=int)
The ones() function generates a vector in integer format.
>>> y
array([1, 1, 1, 1, 1])
You can also define another data type (bool, float, complex).
Example 3 (matrix)
Create a 2x3 matrix
>>> import numpy as np
>>> y=np.ones([2,3])
The function creates a two-dimensional 2x3 matrix
array([[1., 1., 1.],
[1., 1., 1.]])
The object consists of two lists.
Each list is a row of the matrix.
