PetscOptionsReal#
Gets a PetscReal
value for a particular option in the database.
Synopsis#
#include <petscoptions.h>
PetscErrorCode PetscOptionsReal(const char opt[], const char text[], const char man[], PetscReal currentvalue, PetscReal *value, PetscBool *set)
Logically Collective on the communicator passed in PetscOptionsBegin()
Input Parameters#
opt - option name
text - short string that describes the option
man - manual page with additional information on option
currentvalue - the current value; caller is responsible for setting this value correctly. Normally this is done with either
PetscOptionsReal(..., obj->value,&obj->value,...) or
value = defaultvalue
PetscOptionsReal(..., value,&value,&set);
if (set) {
Output Parameters#
value - the value to return
set -
PETSC_TRUE
if found, elsePETSC_FALSE
Notes#
If the user does not supply the option at all value
is NOT changed. Thus
you should ALWAYS initialize value
if you access it without first checking that set
is PETSC_TRUE
.
The currentvalue
passed into this routine does not get transferred to the output value
variable automatically.
Must be used between a PetscOptionsBegin()
and a PetscOptionsEnd()
See Also#
PetscOptionsGetReal()
, PetscOptionsHasName()
, PetscOptionsGetString()
, PetscOptionsGetInt()
,
PetscOptionsGetIntArray()
, PetscOptionsGetRealArray()
, PetscOptionsGetBool()
,
PetscOptionsInt()
, PetscOptionsString()
, PetscOptionsReal()
, PetscOptionsBool()
,
PetscOptionsName()
, PetscOptionsBegin()
, PetscOptionsEnd()
, PetscOptionsHeadBegin()
,
PetscOptionsStringArray()
, PetscOptionsRealArray()
, PetscOptionsScalar()
,
PetscOptionsBoolGroupBegin()
, PetscOptionsBoolGroup()
, PetscOptionsBoolGroupEnd()
,
PetscOptionsFList()
, PetscOptionsEList()
, PetscOptionsBoundedReal()
, PetscOptionsRangeReal()
Level#
beginner
Location#
Examples#
src/ts/tutorials/ex26.c
src/ts/utils/dmplexlandau/tutorials/ex2.c
src/ts/tutorials/extchemfield.c
src/dm/impls/plex/tutorials/ex13.c
src/dm/impls/plex/tutorials/ex9.c
src/ts/tutorials/ex32.c
src/ts/tutorials/ex48.c
src/ts/tutorials/ex20.c
src/ts/tutorials/ex52.c
src/ts/tutorials/ex31.c
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages