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DS-1000 / 774 / Using scipy, is there an easy way to emulate the behaviour of MATLAB's dctmtx…

Problem

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Problem:

Using scipy, is there an easy way to emulate the behaviour of MATLAB's dctmtx function which returns a NxN (ortho-mode normed) DCT matrix for some given N? There's scipy.fftpack.dctn but that only applies the DCT. Do I have to implement this from scratch if I don't want use another dependency besides scipy?
A:
<code>
import numpy as np
import scipy.fft as sf
N = 8
</code>
result = ... # put solution in this variable
BEGIN SOLUTION
<code>

library

Scipy

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Source and history

upstream_id / Original problem ID
774
task_id
d2c994fa-9f1c-5c58-b767-aefc45851eb8
task_key
default--test--774
task_revision_id
1
config / split
default / test

Official source

initial import