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Unnecessarily convoluted code #48

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yairdaon opened this issue Apr 2, 2024 · 0 comments

yairdaon commented Apr 2, 2024

In examples/inference/ex08-optimal_design.ipynb in the fifth code cell the following lines appear:

make a fltr to get Is for each age class

fltr1=np.kron([[0, 0, 0, 1]], np.identity(M))
obs1=np.einsum('ij,kj->ki', fltr1, x)

This is a very interesting way of writing
obs1 = x[:,-2:]

Verify:

import numpy as np
M = 2
x = np.random.randn(200, 4*M)

fltr1=np.kron([[0, 0, 0, 1]], np.identity(M))
np.all(np.einsum('ij,kj->ki', fltr1, x) == x[:,-2:])

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