☰

awk を使用して、列数が異なる各行の平均を計算します。

tag-icon • tag-icon text-processing awk command-line
awk を使用して、列数が異なる各行の平均を計算します。

awk計算に使用できますか？平均各行（各行には異なる列があります）次のファイルがあります。最初の列は名前です。各行の平均を計算し、入力ファイルの最後の列に結果を印刷したいと思います。

入力ファイル( data1.csv):

EMPLOYEE1,0.395314,0.384513,,
EMPLOYEE2,5.4908,5.2921,,
EMPLOYEE3,0.0002323,0.00022945,0.00023238,0.00022931
EMPLOYEE4,0.00335516,0.00328432,0.00340309,0.00327163
EMPLOYEE5,1.4816,1.4367,1.4854,1.4353
EMPLOYEE6,7.89E-06,7.93E-06,7.95E-06,7.87E-06
EMPLOYEE7,3.724E-06,3.8745E-06,3.9428E-06,3.7227E-06
EMPLOYEE8,0.699498,0.688892,0.704256,0.683486
EMPLOYEE9,33.5195,31.9736,33.6779,31.742

希望の出力：

EMPLOYEE1,0.395314,0.384513,,,0.3899135
EMPLOYEE2,5.4908,5.2921,,,5.39145
EMPLOYEE3,0.0002323,0.00022945,0.00023238,0.00022931,0.00023086
EMPLOYEE4,0.00335516,0.00328432,0.00340309,0.00327163,0.00332855
EMPLOYEE5,1.4816,1.4367,1.4854,1.4353,1.45975
EMPLOYEE6,7.89E-06,7.93E-06,7.95E-06,7.87E-06,7.91E-06
EMPLOYEE7,3.72E-06,3.87E-06,3.94E-06,3.72E-06,3.82E-06
EMPLOYEE8,0.699498,0.688892,0.704256,0.683486,0.694033
EMPLOYEE9,33.5195,31.9736,33.6779,31.742,32.7282

以下を試しましたが、 awk列が最大NFより小さい行の平均を計算しません。

awk  -F',' '{ s = 0; for (i = 2; i <= NF; i++) s += $i; print $1, (NF > 1) ? s / (NF - 1) : 0; }'  data1.csv

そして

 awk -F','  '{sum=0; for (i=2;i<=NF;i++)sum+=$i; print $0,sum/(NF-1)}'  data1.csv

しかし、私のコードはNF行を変更しません。各行のNFを変更して、希望の出力を得ることはできますか？

答え1

1つの方法は次のとおりです。

$ awk -F',' -v OFS=',' '{ 
        s=0; 
        numFields=0; 
        for(i=2; i<=NF;i++){ 
            if(length($i)){ 
                s+=$i; 
                numFields++
            } 
        } 
        print $0, (numFields ? s/numFields : 0)}' data1.csv 
EMPLOYEE1,0.395314,0.384513,,,0.389914
EMPLOYEE2,5.4908,5.2921,,,5.39145
EMPLOYEE3,0.0002323,0.00022945,0.00023238,0.00022931,0.00023086
EMPLOYEE4,0.00335516,0.00328432,0.00340309,0.00327163,0.00332855
EMPLOYEE5,1.4816,1.4367,1.4854,1.4353,1.45975
EMPLOYEE6,7.89E-06,7.93E-06,7.95E-06,7.87E-06,7.91e-06
EMPLOYEE7,3.724E-06,3.8745E-06,3.9428E-06,3.7227E-06,3.816e-06
EMPLOYEE8,0.699498,0.688892,0.704256,0.683486,0.694033
EMPLOYEE9,33.5195,31.9736,33.6779,31.742,32.7282

0.389914awkによって印刷された結果は、最初の0.779827/2行の平均では0.389914なくなることを意味します0.389915。これは、awkが最も近い偶数に丸められ、デフォルトの印刷モード（変数によって制御されますOFMT）があるためです%0.6g。さらに精度が必要な場合は、次のことができます。

$ awk -F',' -v OFS=',' -v OFMT='%0.7g' '{ 
        s=0; 
        numFields=0; 
        for(i=2; i<=NF;i++){ 
            if(length($i)){ 
                s+=$i; 
                numFields++
            } 
        } 
        print $0, (numFields ? s/numFields : 0)}' data1.csv 
EMPLOYEE1,0.395314,0.384513,,,0.3899135
EMPLOYEE2,5.4908,5.2921,,,5.39145
EMPLOYEE3,0.0002323,0.00022945,0.00023238,0.00022931,0.00023086
EMPLOYEE4,0.00335516,0.00328432,0.00340309,0.00327163,0.00332855
EMPLOYEE5,1.4816,1.4367,1.4854,1.4353,1.45975
EMPLOYEE6,7.89E-06,7.93E-06,7.95E-06,7.87E-06,7.91e-06
EMPLOYEE7,3.724E-06,3.8745E-06,3.9428E-06,3.7227E-06,3.816e-06
EMPLOYEE8,0.699498,0.688892,0.704256,0.683486,0.694033
EMPLOYEE9,33.5195,31.9736,33.6779,31.742,32.72825

関連情報