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---
:name: dlasq4
:md5sum: 6d8b1df65fc2a9a01be27c77f4c07567
:category: :subroutine
:arguments:
- i0:
:type: integer
:intent: input
- n0:
:type: integer
:intent: input
- z:
:type: doublereal
:intent: input
:dims:
- 4*n0
- pp:
:type: integer
:intent: input
- n0in:
:type: integer
:intent: input
- dmin:
:type: doublereal
:intent: input
- dmin1:
:type: doublereal
:intent: input
- dmin2:
:type: doublereal
:intent: input
- dn:
:type: doublereal
:intent: input
- dn1:
:type: doublereal
:intent: input
- dn2:
:type: doublereal
:intent: input
- tau:
:type: doublereal
:intent: output
- ttype:
:type: integer
:intent: output
- g:
:type: real
:intent: input/output
:substitutions: {}
:fortran_help: " SUBROUTINE DLASQ4( I0, N0, Z, PP, N0IN, DMIN, DMIN1, DMIN2, DN, DN1, DN2, TAU, TTYPE, G )\n\n\
* Purpose\n\
* =======\n\
*\n\
* DLASQ4 computes an approximation TAU to the smallest eigenvalue\n\
* using values of d from the previous transform.\n\
*\n\n\
* I0 (input) INTEGER\n\
* First index.\n\
*\n\
* N0 (input) INTEGER\n\
* Last index.\n\
*\n\
* Z (input) DOUBLE PRECISION array, dimension ( 4*N )\n\
* Z holds the qd array.\n\
*\n\
* PP (input) INTEGER\n\
* PP=0 for ping, PP=1 for pong.\n\
*\n\
* NOIN (input) INTEGER\n\
* The value of N0 at start of EIGTEST.\n\
*\n\
* DMIN (input) DOUBLE PRECISION\n\
* Minimum value of d.\n\
*\n\
* DMIN1 (input) DOUBLE PRECISION\n\
* Minimum value of d, excluding D( N0 ).\n\
*\n\
* DMIN2 (input) DOUBLE PRECISION\n\
* Minimum value of d, excluding D( N0 ) and D( N0-1 ).\n\
*\n\
* DN (input) DOUBLE PRECISION\n\
* d(N)\n\
*\n\
* DN1 (input) DOUBLE PRECISION\n\
* d(N-1)\n\
*\n\
* DN2 (input) DOUBLE PRECISION\n\
* d(N-2)\n\
*\n\
* TAU (output) DOUBLE PRECISION\n\
* This is the shift.\n\
*\n\
* TTYPE (output) INTEGER\n\
* Shift type.\n\
*\n\
* G (input/output) REAL\n\
* G is passed as an argument in order to save its value between\n\
* calls to DLASQ4.\n\
*\n\n\
* Further Details\n\
* ===============\n\
* CNST1 = 9/16\n\
*\n\
* =====================================================================\n\
*\n"
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