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---
:name: dlasq6
:md5sum: 51937f03f827ecc2ba8f5b8564d50417
: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
- dmin:
:type: doublereal
:intent: output
- dmin1:
:type: doublereal
:intent: output
- dmin2:
:type: doublereal
:intent: output
- dn:
:type: doublereal
:intent: output
- dnm1:
:type: doublereal
:intent: output
- dnm2:
:type: doublereal
:intent: output
:substitutions: {}
:fortran_help: " SUBROUTINE DLASQ6( I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2 )\n\n\
* Purpose\n\
* =======\n\
*\n\
* DLASQ6 computes one dqd (shift equal to zero) transform in\n\
* ping-pong form, with protection against underflow and overflow.\n\
*\n\n\
* Arguments\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. EMIN is stored in Z(4*N0) to avoid\n\
* an extra argument.\n\
*\n\
* PP (input) INTEGER\n\
* PP=0 for ping, PP=1 for pong.\n\
*\n\
* DMIN (output) DOUBLE PRECISION\n\
* Minimum value of d.\n\
*\n\
* DMIN1 (output) DOUBLE PRECISION\n\
* Minimum value of d, excluding D( N0 ).\n\
*\n\
* DMIN2 (output) DOUBLE PRECISION\n\
* Minimum value of d, excluding D( N0 ) and D( N0-1 ).\n\
*\n\
* DN (output) DOUBLE PRECISION\n\
* d(N0), the last value of d.\n\
*\n\
* DNM1 (output) DOUBLE PRECISION\n\
* d(N0-1).\n\
*\n\
* DNM2 (output) DOUBLE PRECISION\n\
* d(N0-2).\n\
*\n\n\
* =====================================================================\n\
*\n\
* .. Parameter ..\n DOUBLE PRECISION ZERO\n PARAMETER ( ZERO = 0.0D0 )\n\
* ..\n\
* .. Local Scalars ..\n INTEGER J4, J4P2\n DOUBLE PRECISION D, EMIN, SAFMIN, TEMP\n\
* ..\n\
* .. External Function ..\n DOUBLE PRECISION DLAMCH\n EXTERNAL DLAMCH\n\
* ..\n\
* .. Intrinsic Functions ..\n INTRINSIC MIN\n\
* ..\n"
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