Question

所以我查看了while循环的示例并将脚本放在一起，但仍然存在问题。如果我猜测我会用bc函数的算术部分说出来。

我希望循环运行直到我达到一千，然后计算它运行了多少次。我不是要编写脚本的计数部分，因为我仍然只是想让它运行（是的，我知道awk会更容易）。

这是我到目前为止所做的：

#!/bin/bash
total=120 #this will be a variable that is read in from a menu but 120 is ok for now
while [ $total -lt 1000000 ]
do
echo $total
total=$(bc<<<"scale=2;$total +  $total * .1") #I don't know if I have to use "let" before total but it did not make a difference.
done.

我收到以＆＃34; total＆＃34;开头的行的错误但命令的结构似乎适合我能找到的所有例子。是什么给了什么？

Answer 1

使用bc进行比较。

#!/usr/bin/env bash

total=120
while [ "$(bc <<< "$total < 1000000")" == 1 ]
do
    echo $total
    total=$(bc <<< "scale=2;$total +  $total * .1")
done

Answer 2

只要处理整数，就可以使用算术表达式def mutual_info_classif_custom(X, y): # To change discrete_features, # you need to redefine the function each time # Because once the func def is supplied to selectKBest, it cant be changed discrete_features = [0, 1, 2] return mutual_info_classif(X, y, discrete_features)编写循环，而不需要像selector = SelectKBest(mutual_info_classif_custom).fit(X, y)这样的外部命令：

(( ... ))

使用整数的Bash循环问题

2 个答案: