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Return a 2-D array with ones on the diagonal and zeros elsewhere in Numpy
The numpy.eye() returns a 2-D array with 1’s as the diagonal and 0’s elsewhere. Here, the 1st parameter means the "Number of rows in the output" i.e. 4 means 4x4 array. The 2nd parameter is the number of columns in the output.
The function eye() returns an array where all elements are equal to zero, except for the k-th diagonal, whose values are equal to one. The dtype is the data-type of the returned array. The order suggests whether the output should be stored in row-major (C-style) or column-major (Fortran-style) order in memory.
The like parameter is a reference object to allow the creation of arrays which are not NumPy arrays. If an array-like passed in as like supports the __array_function__ protocol, the result will be defined by it. In this case, it ensures the creation of an array object compatible with that passed in via this argument.
Steps
At first, import the required library −
import numpy as np
Create a 2d array. The numpy.eye() returns a 2-D array with 1’s as the diagonal and 0’s elsewhere. Here, the 1st parameter means the "Number of rows in the output" i.e. 4 means 4x4 array. The 2nd parameter is the number of columns in the output. If None, defaults to the 1st parameter i.e. 4x4 here −
arr = np.eye(4)
Display the array −
print("Array...\n", arr)
Get the type of the array −
print("\nArray type...\n", arr.dtype)
Get the shape of the array −
print("\nArray shape...\n", arr.shape)
Get the dimensions of the Array −
print("\nArray Dimensions...\n",arr.ndim)
Get the number of elements of the Array −
print("\nArray (count of elements)...\n",arr.size)
Example
import numpy as np # Create a 2d array # The numpy.eye() returns a 2-D array with 1’s as the diagonal and 0’s elsewhere. # Here, the 1st parameter means the "Number of rows in the output" i.e. 4 means 4x4 array # The 2nd parameter is the number of columns in the output. If None, defaults to the 1st parameter i.e. 4x4 here. arr = np.eye(4) # Display the array print("Array...\n", arr) # Get the type of the array print("\nArray type...\n", arr.dtype) # Get the shape of the array print("\nArray shape...\n", arr.shape) # Get the dimensions of the Array print("\nArray Dimensions...\n",arr.ndim) # Get the number of elements of the Array print("\nArray (count of elements)...\n",arr.size)
Output
Array... [[1. 0. 0. 0.] [0. 1. 0. 0.] [0. 0. 1. 0.] [0. 0. 0. 1.]] Array type... float64 Array shape... (4, 4) Array Dimensions... 2 Array (count of elements)... 16
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