How to Convert Matlab for-loop in Python

Question

Nils Conradf 2021-11-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1586459-how-to-convert-matlab-for-loop-in-python

回答： Yongjian Feng 2021-11-20

I have a code in Matlab and need to convert it to python:

for idx = 1: numel(alpha)
x(idx) = radius * math.cos(math.pi/180*alpha(idx))
x(idx) = x (idx) + center(1)
y(idx) = radius * math.sin(math.pi/180*alpha(idx))
y(idx) = y (idx) + center(2)
end

I converted the first line with numpy as np to:

for idx in range(1, np.nummel(alpha)):

but i dont know how to convert the other lines.

It is an compute for an circle.

Thanks for every help.

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Answer 1

Yongjian Feng 2021-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/1586459-how-to-convert-matlab-for-loop-in-python#answer_836129

在 MATLAB Online 中打开

Your code looks like mixture of matlab and python already. math.sin is python, not matlab. Try this:

import math
# Not sure you are usign 0-based or 1-based. You need to check that. python is normally 0-based
for idx in range(0, np.nummel(alpha)):
    x[idx] = radius * math.cos(math.pi/180*alpha[idx])
    x[idx] = x[idx] + center[1]
    y[idx] = radius * math.sin(math.pi/180*alpha[idx])
    y[idx] = y[idx] + center[2]