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Top Forums UNIX for Dummies Questions & Answers a dummy question on data processing Post 302344834 by kaixinsjtu on Monday 17th of August 2009 06:42:50 PM
Old 08-17-2009
CPU & Memory a dummy question on data processing

Hi, everyone,
I have a matrix, let's say:

1 2 3 4 5 6 ...
4 5 6 7 8 9 ...
7 8 9 1 2 3 ...
3 4 5 6 7 8 ...
.........
(nxm matrix)

Is there a simple command that can take certain specific rows out of the matrix?
e.g., I want to take row 2 (4 5 6 7 8 9 ...) and row 4 (3 4 5 6 7 8 ...) out and put them into another file. I failed to do that with "grep". Do y'all have any idea ? Thanks.
Also, how to remove certain specific rows from the original file? (I know cut works if I want to remove columns, but how about rows??) Thanks a lot. Smilie
 

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zheswapr.f(3)							      LAPACK							     zheswapr.f(3)

NAME
zheswapr.f - SYNOPSIS
Functions/Subroutines subroutine zheswapr (UPLO, N, A, LDA, I1, I2) ZHESWAPR applies an elementary permutation on the rows and columns of a Hermitian matrix. Function/Subroutine Documentation subroutine zheswapr (characterUPLO, integerN, complex*16, dimension( lda, n )A, integerLDA, integerI1, integerI2) ZHESWAPR applies an elementary permutation on the rows and columns of a Hermitian matrix. Purpose: ZHESWAPR applies an elementary permutation on the rows and the columns of a hermitian matrix. Parameters: UPLO UPLO is CHARACTER*1 Specifies whether the details of the factorization are stored as an upper or lower triangular matrix. = 'U': Upper triangular, form is A = U*D*U**T; = 'L': Lower triangular, form is A = L*D*L**T. N N is INTEGER The order of the matrix A. N >= 0. A A is COMPLEX*16 array, dimension (LDA,N) On entry, the NB diagonal matrix D and the multipliers used to obtain the factor U or L as computed by CSYTRF. On exit, if INFO = 0, the (symmetric) inverse of the original matrix. If UPLO = 'U', the upper triangular part of the inverse is formed and the part of A below the diagonal is not referenced; if UPLO = 'L' the lower triangular part of the inverse is formed and the part of A above the diagonal is not referenced. LDA LDA is INTEGER The leading dimension of the array A. LDA >= max(1,N). I1 I1 is INTEGER Index of the first row to swap I2 I2 is INTEGER Index of the second row to swap Author: Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd. Date: September 2012 Definition at line 103 of file zheswapr.f. Author Generated automatically by Doxygen for LAPACK from the source code. Version 3.4.2 Tue Sep 25 2012 zheswapr.f(3)
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