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Broadcasting with NumPy Arrays Example

Outrageous Ostrich answered on April 21, 2022 Popularity 6/10 Helpfulness 1/10

answer Broadcasting with NumPy Arrays Example

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Broadcasting with NumPy Arrays Example

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# welcome to softhunt.net
import numpy as np

v = np.array([23, 3, 43])
w = np.array([15, 5])

# To compute an outer product we first
# reshape v to a column vector of shape 3x1
# then broadcast it against w to yield an output
# of shape 3x2 which is the outer product of v and w
print(np.reshape(v, (3, 1)) * w, "\n")

X = np.array([[42, 3, 21], [5, 32, 32]])

# x has shape 2x3 and v has shape (3, )
# so they broadcast to 2x3,
print(X + v, "\n")

# Add a vector to each column of a matrix X has
# shape 2x3 and w has shape (2, ) If we transpose X
# then it has shape 3x2 and can be broadcast against w
# to yield a result of shape 3x2.

# Transposing this yields the final result
# of shape 2x3 which is the matrix.
print((X.T + w).T, "\n")

# Another solution is to reshape w to be a column
# vector of shape 2X1 we can then broadcast it
# directly against X to produce the same output.
print(X + np.reshape(w, (2, 1)), "\n")

# Multiply a matrix by a constant, X has shape 2x3.
# Numpy treats scalars as arrays of shape();
# these can be broadcast together to shape 2x3.
print(X * 2)

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Source: softhunt.net

Tags: arrays broadcasting numpy python

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Contributed on Apr 21 2022

Outrageous Ostrich

0 Answers Avg Quality 2/10

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Algorithm of Broadcasting with NumPy Arrays

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p = max(m, n)
if m < p:
    left-pad A's shape with 1s until it also has p dimensions

else if n < p:
    left-pad B's shape with 1s until it also has p dimensions
result_dims = new list with p elements

for i in p-1 ... 0:
    A_dim_i = A.shape[i]
    B_dim_i = B.shape[i]
    if A_dim_i != 1 and B_dim_i != 1 and A_dim_i != B_dim_i:
        raise ValueError("could not broadcast")
    else:
        # Pick the Array which is having maximum Dimension
        result_dims[i] = max(A_dim_i, B_dim_i)

Popularity 3/10 Helpfulness 1/10 Language python

Source: softhunt.net

Tags: arrays python broadcasting numpy algorithm

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Contributed on Apr 21 2022

Outrageous Ostrich

0 Answers Avg Quality 2/10

Broadcasting with NumPy Arrays Example

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