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---
:name: slarrc
:md5sum: 4fc70568a595ea2437abc06e26daf307
:category: :subroutine
:arguments:
- jobt:
:type: char
:intent: input
- n:
:type: integer
:intent: input
- vl:
:type: real
:intent: input
- vu:
:type: real
:intent: input
- d:
:type: real
:intent: input
:dims:
- n
- e:
:type: real
:intent: input
:dims:
- n
- pivmin:
:type: real
:intent: input
- eigcnt:
:type: integer
:intent: output
- lcnt:
:type: integer
:intent: output
- rcnt:
:type: integer
:intent: output
- info:
:type: integer
:intent: output
:substitutions: {}
:fortran_help: " SUBROUTINE SLARRC( JOBT, N, VL, VU, D, E, PIVMIN, EIGCNT, LCNT, RCNT, INFO )\n\n\
* Purpose\n\
* =======\n\
*\n\
* Find the number of eigenvalues of the symmetric tridiagonal matrix T\n\
* that are in the interval (VL,VU] if JOBT = 'T', and of L D L^T\n\
* if JOBT = 'L'.\n\
*\n\n\
* Arguments\n\
* =========\n\
*\n\
* JOBT (input) CHARACTER*1\n\
* = 'T': Compute Sturm count for matrix T.\n\
* = 'L': Compute Sturm count for matrix L D L^T.\n\
*\n\
* N (input) INTEGER\n\
* The order of the matrix. N > 0.\n\
*\n\
* VL (input) DOUBLE PRECISION\n\
* VU (input) DOUBLE PRECISION\n\
* The lower and upper bounds for the eigenvalues.\n\
*\n\
* D (input) DOUBLE PRECISION array, dimension (N)\n\
* JOBT = 'T': The N diagonal elements of the tridiagonal matrix T.\n\
* JOBT = 'L': The N diagonal elements of the diagonal matrix D.\n\
*\n\
* E (input) DOUBLE PRECISION array, dimension (N)\n\
* JOBT = 'T': The N-1 offdiagonal elements of the matrix T.\n\
* JOBT = 'L': The N-1 offdiagonal elements of the matrix L.\n\
*\n\
* PIVMIN (input) REAL\n\
* The minimum pivot in the Sturm sequence for T.\n\
*\n\
* EIGCNT (output) INTEGER\n\
* The number of eigenvalues of the symmetric tridiagonal matrix T\n\
* that are in the interval (VL,VU]\n\
*\n\
* LCNT (output) INTEGER\n\
* RCNT (output) INTEGER\n\
* The left and right negcounts of the interval.\n\
*\n\
* INFO (output) INTEGER\n\
*\n\n\
* Further Details\n\
* ===============\n\
*\n\
* Based on contributions by\n\
* Beresford Parlett, University of California, Berkeley, USA\n\
* Jim Demmel, University of California, Berkeley, USA\n\
* Inderjit Dhillon, University of Texas, Austin, USA\n\
* Osni Marques, LBNL/NERSC, USA\n\
* Christof Voemel, University of California, Berkeley, USA\n\
*\n\
* =====================================================================\n\
*\n"
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