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Full Discussion: Transpose columns to Rows : Big data
Top Forums Shell Programming and Scripting Transpose columns to Rows : Big data Post 302443726 by alister on Tuesday 10th of August 2010 01:42:46 AM
Old 08-10-2010
Quote:
Originally Posted by rdcwayx
The code will have problem, if some lines don't have same columns.

kurumi's code is still correct in this situation.
Strictly speaking, neither solution correctly handles irregular lengths; properly handling a file with differing row lengths would involve not making any assumptions based on a single row (if row n has more columns than row 1, truncation would occur).

In any case, nothing in the original post implies that rows vary in width. Quite the contrary, the word "matrix" is used, which indicates a rectangular array. Still, it's good that you pointed that out just in case it is a concern.

On a different note, if memory allows, when dealing with a very large dataset, my solution should be much much much faster. Only one instance of awk is needed and the file is only read once. kurumi's will fork-exec 600,000 awk processes and read the file 600,000 times.
 

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LEARN ABOUT CENTOS

slaswp

slaswp.f(3)							      LAPACK							       slaswp.f(3)

NAME

       slaswp.f -

SYNOPSIS

   Functions/Subroutines
       subroutine slaswp (N, A, LDA, K1, K2, IPIV, INCX)
	   SLASWP performs a series of row interchanges on a general rectangular matrix.

Function/Subroutine Documentation
   subroutine slaswp (integerN, real, dimension( lda, * )A, integerLDA, integerK1, integerK2, integer, dimension( * )IPIV, integerINCX)
       SLASWP performs a series of row interchanges on a general rectangular matrix.

       Purpose:

	    SLASWP performs a series of row interchanges on the matrix A.
	    One row interchange is initiated for each of rows K1 through K2 of A.

       Parameters:
	   N

		     N is INTEGER
		     The number of columns of the matrix A.

	   A

		     A is REAL array, dimension (LDA,N)
		     On entry, the matrix of column dimension N to which the row
		     interchanges will be applied.
		     On exit, the permuted matrix.

	   LDA

		     LDA is INTEGER
		     The leading dimension of the array A.

	   K1

		     K1 is INTEGER
		     The first element of IPIV for which a row interchange will
		     be done.

	   K2

		     K2 is INTEGER
		     The last element of IPIV for which a row interchange will
		     be done.

	   IPIV

		     IPIV is INTEGER array, dimension (K2*abs(INCX))
		     The vector of pivot indices.  Only the elements in positions
		     K1 through K2 of IPIV are accessed.
		     IPIV(K) = L implies rows K and L are to be interchanged.

	   INCX

		     INCX is INTEGER
		     The increment between successive values of IPIV.  If IPIV
		     is negative, the pivots are applied in reverse order.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Further Details:

	     Modified by
	      R. C. Whaley, Computer Science Dept., Univ. of Tenn., Knoxville, USA

       Definition at line 115 of file slaswp.f.

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

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