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# Compute a matrix transpose with Einstein summation convention in Python

The einsum() method evaluates the Einstein summation convention on the operands. Using the Einstein summation convention, many common multi-dimensional, linear algebraic array operations can be represented in a simple fashion. In implicit mode einsum computes these values. In explicit mode, einsum provides further flexibility to compute other array operations that might not be considered classical Einstein summation operations, by disabling, or forcing summation over specified subscript labels.

To compute a matrix transpose with Einstein summation convention, use the numpy.einsum() method in Python. The 1st parameter is the subscript. It specifies the subscripts for summation as comma separated list of subscript labels. The 2nd parameter is the operands. These are the arrays for the operation.

## Steps

At first, import the required libraries −

import numpy as np

Creating a numpy array using the arange() and reshape() method −

arr = np.arange(16).reshape(4,4)

Display the array −

print("Our Array...

",arr)

Check the Dimensions −

print("

Dimensions of our Array...

",arr.ndim)

Get the Datatype −

print("

Datatype of our Array object...

",arr.dtype)

Get the Shape −

print("

Shape of our Array object...

",arr.shape)

To compute a matrix transpose with Einstein summation convention, use the numpy.einsum() method in Python −

print("

Result (transpose)...

",np.einsum('ji', arr))

## Example

import numpy as np # Creating a numpy array using the arange() and reshape() method arr = np.arange(16).reshape(4,4) # Display the array print("Our Array...

",arr) # Check the Dimensions print("

Dimensions of our Array...

",arr.ndim) # Get the Datatype print("

Datatype of our Array object...

",arr.dtype) # Get the Shape print("

Shape of our Array object...

",arr.shape) # To compute a matrix transpose with Einstein summation convention, use the numpy.einsum() method in Python. print("

Result (transpose)...

",np.einsum('ji', arr))

## Output

Our Array... [[ 0 1 2 3] [ 4 5 6 7] [ 8 9 10 11] [12 13 14 15]] Dimensions of our Array... 2 Datatype of our Array object... int64 Shape of our Array object... (4, 4) Result (transpose)... [[ 0 4 8 12] [ 1 5 9 13] [ 2 6 10 14] [ 3 7 11 15]]

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