小编vba*_*vci的帖子

在Python和Matlab中,我编写了生成矩阵的代码,并使用索引函数填充它.Python代码的执行时间大约是Matlab代码执行时间的20倍.具有相同结果的两个函数是用python编写的,bWay()基于这个答案

这是完整的Python代码:

import numpy as np
from timeit import timeit

height = 1080
width = 1920
heightCm = 30
distanceCm = 70

centerY = height / 2 - 0.5;
centerX = width / 2 - 0.5;

constPart = height * heightCm / distanceCm

def aWay():
    M = np.empty([height, width], dtype=np.float64);
    for y in xrange(height):
        for x in xrange(width):
            M[y, x] = np.arctan(pow((pow((centerX - x), 2) + pow((centerY - y), 2)), 0.5) / constPart)

def bWay():
    M = …