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Top Forums Shell Programming and Scripting Find and replace a word in all the files (that contain the word) under a directory Post 302561674 by filter on Tuesday 4th of October 2011 10:52:06 PM
Old 10-04-2011
Thanks a lot for your replies.

Really solved my problem.

Appreciate your thoughts. Smilie
 

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slagts.f(3)							      LAPACK							       slagts.f(3)

NAME
slagts.f - SYNOPSIS
Functions/Subroutines subroutine slagts (JOB, N, A, B, C, D, IN, Y, TOL, INFO) SLAGTS solves the system of equations (T-I)x = y or (T-I)Tx = y,where T is a general tridiagonal matrix and a scalar, using the LU factorization computed by slagtf. Function/Subroutine Documentation subroutine slagts (integerJOB, integerN, real, dimension( * )A, real, dimension( * )B, real, dimension( * )C, real, dimension( * )D, integer, dimension( * )IN, real, dimension( * )Y, realTOL, integerINFO) SLAGTS solves the system of equations (T-I)x = y or (T-I)Tx = y,where T is a general tridiagonal matrix and a scalar, using the LU factorization computed by slagtf. Purpose: SLAGTS may be used to solve one of the systems of equations (T - lambda*I)*x = y or (T - lambda*I)**T*x = y, where T is an n by n tridiagonal matrix, for x, following the factorization of (T - lambda*I) as (T - lambda*I) = P*L*U , by routine SLAGTF. The choice of equation to be solved is controlled by the argument JOB, and in each case there is an option to perturb zero or very small diagonal elements of U, this option being intended for use in applications such as inverse iteration. Parameters: JOB JOB is INTEGER Specifies the job to be performed by SLAGTS as follows: = 1: The equations (T - lambda*I)x = y are to be solved, but diagonal elements of U are not to be perturbed. = -1: The equations (T - lambda*I)x = y are to be solved and, if overflow would otherwise occur, the diagonal elements of U are to be perturbed. See argument TOL below. = 2: The equations (T - lambda*I)**Tx = y are to be solved, but diagonal elements of U are not to be perturbed. = -2: The equations (T - lambda*I)**Tx = y are to be solved and, if overflow would otherwise occur, the diagonal elements of U are to be perturbed. See argument TOL below. N N is INTEGER The order of the matrix T. A A is REAL array, dimension (N) On entry, A must contain the diagonal elements of U as returned from SLAGTF. B B is REAL array, dimension (N-1) On entry, B must contain the first super-diagonal elements of U as returned from SLAGTF. C C is REAL array, dimension (N-1) On entry, C must contain the sub-diagonal elements of L as returned from SLAGTF. D D is REAL array, dimension (N-2) On entry, D must contain the second super-diagonal elements of U as returned from SLAGTF. IN IN is INTEGER array, dimension (N) On entry, IN must contain details of the matrix P as returned from SLAGTF. Y Y is REAL array, dimension (N) On entry, the right hand side vector y. On exit, Y is overwritten by the solution vector x. TOL TOL is REAL On entry, with JOB .lt. 0, TOL should be the minimum perturbation to be made to very small diagonal elements of U. TOL should normally be chosen as about eps*norm(U), where eps is the relative machine precision, but if TOL is supplied as non-positive, then it is reset to eps*max( abs( u(i,j) ) ). If JOB .gt. 0 then TOL is not referenced. On exit, TOL is changed as described above, only if TOL is non-positive on entry. Otherwise TOL is unchanged. INFO INFO is INTEGER = 0 : successful exit .lt. 0: if INFO = -i, the i-th argument had an illegal value .gt. 0: overflow would occur when computing the INFO(th) element of the solution vector x. This can only occur when JOB is supplied as positive and either means that a diagonal element of U is very small, or that the elements of the right-hand side vector y are very large. Author: Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd. Date: September 2012 Definition at line 162 of file slagts.f. Author Generated automatically by Doxygen for LAPACK from the source code. Version 3.4.2 Tue Sep 25 2012 slagts.f(3)
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