在linux中的两个不同文件中进行数学运算

时间:2013-04-25 15:54:05

标签: linux awk

我有两个数据文件,每个文件有3列。如何在这两个文件的第三列中划分相应的元素,并将其写入linux或awk中的另一个文件中。

Experiment Replica Mean
General0 0 408.5
General0 1 461.162
General0 2 428.23
General0 3 373.771
General0 4 396.243

Experiment Replica Mean
General0 0 124.674
General0 1 142.017
General0 2 145.206
General0 3 118.493
General0 4 126.985

Experiment Replica Mean
General0 0 124.674 / 408.5
General0 1 
General0 2 
General0 3 
General0 4 

2 个答案:

答案 0 :(得分:3)

awk 'FNR==NR{a[$1,$2]=$3;next}FNR==1{print;next}{print $1,$2,$3/a[$1,$2]}' f1 f2
Experiment Replica Mean
General0 0 0.3052
General0 1 0.307955
General0 2 0.339084
General0 3 0.31702
General0 4 0.320473

提示:column -t是一个很好的工具,可以将输出格式化为表格:

awk .... | column -t
Experiment  Replica  Mean
General0    0        0.3052
General0    1        0.307955
General0    2        0.339084
General0    3        0.31702
General0    4        0.320473

<强>解释

FNR==NR {            # FNR==NR is only true in the first file 
    a[$1,$2]=$3      # Build array, keys are field 1 and 2, value is field 3
    next             # Skip to the next line in the file
}
FNR==1 {             # If we are on the first line in the second file
    print            # Print the line
    next             # Go grab the next line
}
{
    x=$3/a[$1,$2]    # Do the math (the value of a[$1,$2] is $3 from file1)
    print $1,$2,x    # print the output
}

要以此格式运行脚本,请将其保存到文件script.awk并执行awk -f script.awk f1 f2

答案 1 :(得分:1)

假设相应的记录出现在两个文件的相同位置,文件可以粘贴在一起

paste file1.txt file2.txt | 
awk '/Mean/{print($1, $2, $3)} ! /Mean/ {print($1, $2, $6/$3)}'

Experiment Replica Mean
General0 0 0.3052
General0 1 0.307955
General0 2 0.339084
General0 3 0.31702
General0 4 0.320473

这是sudo_O上面的优雅版本:

paste file1.txt file2.txt | awk '{print $1,$2,/Mean/?$3:$6/$3}'