从矩阵中的单元格中删除空格 [英] remove spaces from cells in matrix

问题描述

我有一个数字矩阵(5800行和350列).每个单元格都是

I have a matrix(5800 rows and 350 columns) of numbers. Each cell is either

0 / 0
1 / 1
2 / 2

删除每个单元格中所有空间的最快方法是:

What is the fastest way to remove all spaces in each cell, to have:

0/0
1/1
2/2

Sed，R，能做到最快的任何事情.

Sed, R, anything that will do it fastest.

推荐答案

如果您要提高效率，则应该使用coreutils tr来完成这样一个简单的任务:

If you are going for efficiency, you should probably use coreutils tr for such a simple task:

tr -d ' ' < infile

我使用GNU awk，GNU sed，perl v5.14.2和GNU coreutils v8.13将发布的答案与300K文件进行了比较.每个测试运行了30次，这是平均值:

I compared the posted answers against a 300K file, using GNU awk, GNU sed, perl v5.14.2 and GNU coreutils v8.13. The tests were each run 30 times, this is the average:

awk  - 1.52s user 0.01s system 99% cpu 1.529 total
sed  - 0.89s user 0.00s system 99% cpu 0.900 total
perl - 0.59s user 0.00s system 98% cpu 0.600 total
tr   - 0.02s user 0.00s system 90% cpu 0.020 total

所有睾丸都按上述(cmd < infile)运行，并且输出定向到/dev/null.

All testes were run as above (cmd < infile) and with the output directed to /dev/null.

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