如何创建具有给定增量的数字范围 [英] How to create a range of numbers with a given increment

问题描述

我想知道列表中是否存在等效语句以执行以下操作.在MATLAB中，我将执行以下操作

I want to know whether there is an equivalent statement in lists to do the following. In MATLAB I would do the following

fid = fopen('inc.txt','w')
init =1;inc = 5; final=51;
a = init:inc:final
l = length(a)
for i = 1:l
   fprintf(fid,'%d\n',a(i));
end
fclose(fid);

简而言之，我有一个初始值，一个最终值和一个增量.我需要创建一个数组(我读到的内容等同于python中的列表)并打印到文件中.

In short I have an initial value, a final value and an increment. I need to create an array (I read it is equivalent to lists in python) and print to a file.

推荐答案

在Python中，可以像Matlab的start:step:stop命令一样使用range(start, stop + 1, step).但是，与Matlab的功能不同，range仅在start，step和stop都是整数时才起作用.如果要使用可用于浮点值的并行函数，请尝试使用numpy中的arange命令:

In Python, range(start, stop + 1, step) can be used like Matlab's start:step:stop command. Unlike Matlab's functionality, however, range only works when start, step, and stop are all integers. If you want a parallel function that works with floating-point values, try the arange command from numpy:

import numpy as np

with open('numbers.txt', 'w') as handle:
    for n in np.arange(1, 5, 0.1):
        handle.write('{}\n'.format(n))

请记住，与Matlab不同，range和np.arange都期望其参数依次为start，stop，然后是step.还请记住，与Matlab语法不同，range和np.arange都会在当前值大于或等于终止值时立即停止.

Keep in mind that, unlike Matlab, range and np.arange both expect their arguments in the order start, stop, then step. Also keep in mind that, unlike the Matlab syntax, range and np.arange both stop as soon as the current value is greater than or equal to the stop value.

http://docs.scipy.org/doc/numpy/reference/generated/numpy.arange.html

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