具有numpy和scipy的矩阵的对角矩阵 [英] diagonal matrix of a matrix with numpy and scipy

问题描述

我有一个矩阵(n * 1)，我想用它做一个对角矩阵. 但是我不能用numpy构造它. 我尝试了numpy中的每个方法，例如此

I have a matrix (n*1) and I want to make a diagonal matrix with it. but I can't construct it with numpy. I tried each methods in numpy such as methods in this

推荐答案

import numpy
arr = numpy.array([1,2,3])
mat = numpy.diag(arr)
print(mat)
>>> 
[[1 0 0]
 [0 2 0]
 [0 0 3]]

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