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Full Discussion: Summing up a matrix using awk
Top Forums Shell Programming and Scripting Summing up a matrix using awk Post 302602584 by chihung on Monday 27th of February 2012 07:41:16 PM
Old 02-27-2012
One-liners are to impress people the power of UNIX.

Let me try to break them down into multi-line with comments so that you can appreciate the real power
Code:
awk '
  # for every odd record number (NR) [NR%2 will equate to 1 (true) for odd NR]
  NR%2 {
    # for every field in each record (NF - number of fields)
    for (i=1; i<=NF; i++) {
      # sum them up and store in an associative array 'a', the index i corresponds to the column number
      a[i]+=$i
    }
  }

  # for every even record number (NR) [!(NR%2) will equate to 1 (true) for even NR. ! means 'not']
  !(NR%2) {
    # for every field in each record (NF - number of fields)
    for (i=1; i<=NF; i++) {
      # add the associative array to the original column position
      $i+=a[i]

      # reset assocaite array to zero
      a[i]=0
    }

    # print the whole row after the changes
    print
  }
' file

These 2 Users Gave Thanks to chihung For This Post:
JRodrigoF vishal_vsh1
 

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LEARN ABOUT CENTOS

clag2z.f

clag2z.f(3)							      LAPACK							       clag2z.f(3)

NAME

       clag2z.f -

SYNOPSIS

   Functions/Subroutines
       subroutine clag2z (M, N, SA, LDSA, A, LDA, INFO)
	   CLAG2Z converts a complex single precision matrix to a complex double precision matrix.

Function/Subroutine Documentation
   subroutine clag2z (integerM, integerN, complex, dimension( ldsa, * )SA, integerLDSA, complex*16, dimension( lda, * )A, integerLDA, integerINFO)
       CLAG2Z converts a complex single precision matrix to a complex double precision matrix.

       Purpose:

	    CLAG2Z converts a COMPLEX matrix, SA, to a COMPLEX*16 matrix, A.

	    Note that while it is possible to overflow while converting
	    from double to single, it is not possible to overflow when
	    converting from single to double.

	    This is an auxiliary routine so there is no argument checking.

       Parameters:
	   M

		     M is INTEGER
		     The number of lines of the matrix A.  M >= 0.

	   N

		     N is INTEGER
		     The number of columns of the matrix A.  N >= 0.

	   SA

		     SA is COMPLEX array, dimension (LDSA,N)
		     On entry, the M-by-N coefficient matrix SA.

	   LDSA

		     LDSA is INTEGER
		     The leading dimension of the array SA.  LDSA >= max(1,M).

	   A

		     A is COMPLEX*16 array, dimension (LDA,N)
		     On exit, the M-by-N coefficient matrix A.

	   LDA

		     LDA is INTEGER
		     The leading dimension of the array A.  LDA >= max(1,M).

	   INFO

		     INFO is INTEGER
		     = 0:  successful exit

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 104 of file clag2z.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2							  Tue Sep 25 2012						       clag2z.f(3)
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