使用bash读取一个矩阵对角线上的元素，并将其重定向到另一个文件 [英] Using bash to read elements on a diagonal on a matrix and redirecting it to another file

问题描述

所以，目前我已经创建了一个code要做到这一点，如下图所示。这code工作和做的事情是应该做的后，我附和变量：

  A =`awk的'NR == 2 {$打印1}$ coor`B =`awk的'NR == 3 {打印$ 2}'$ coor`C =`awk的'NR == 4 {$打印3}$ coor`
 

....但我必须有更多的行做到这一点，我希望有一个更一般的前pression。所以，我试图创建如下所示的循环。语法明智的，我不认为有什么不妥的code，但它不是文件CMAIN输出任何东西。

我想知道是否有人能帮助我，我有点在脚本新的。

如果它可以帮助任何，我也可以发布什么，我要看书了。

 为（（i = 1; I＆LT; = 4;我++））;做
  为（（J = 0; J＆下; = 3; J ++））;做
    B =`grep的-n细胞，$ COOR| awk的'NR ==$ I{打印附加$ J}'`
  DONE
DONE回声$ B＆GT;＆GT; CMAIN
 

解决方案

您可以用这个替换您的 AWK 的行：

 的awk'{为（i = 1; I＆LT; = NF;我++），如果（NR＆GT; = 2及和放大器; NR == I）打印$（I  -  1 ）}'file.txt的
 

测试输入：

  1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80
 

输出：

  11
22
33
44
55
66
77
 

So, currently i have created a code to do this as shown below. This code works and does what it is supposed to do after I echo the variables:

a=`awk 'NR==2 {print $1}' $coor`

b=`awk 'NR==3 {print $2}' $coor`

c=`awK 'NR==4 {print $3}' $coor`

....but i have to do this for many more lines and i want a more general expression. So I have attempted to create a loop shown below. Syntax wise i don't think anything is wrong with the code, but it is not outputting anything to the file "Cmain".

I was wondering if anyone could help me, I'm kinda new at scripting.

If it helps any, I can also post what i am trying to read.

for (( i=1; i <= 4 ; i++ )); do
  for (( j=0; j <= 3 ; j++ )); do
    B="`grep -n "cell" "$coor" | awk 'NR=="$i" {print $j}'`"
  done
done

echo "$B" >> Cmain

解决方案

You can replace your lines of awk with this one:

awk '{ for (i=1; i<=NF; i++) if (NR >= 2 && NR == i) print $(i - 1) }' file.txt

Tested input:

1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80

Output:

11
22
33
44
55
66
77

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