linux - 在 linux 中的两个不同文件中做数学运算

Question

我有两个数据文件，每个文件都有 3 列。如何在linux或awk中将这两个文件中的第三列中的相应元素分开并写入另一个文件中。

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 

Answer 1

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 是将输出格式化为表格的好工具:

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

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
}

要以这种形式运行脚本，请将其保存到文件 script.awk 并执行 awk -f script.awk f1 f2。