# PetscBagRegisterReal
add a `PetscReal` value to a `PetscBag` 
## Synopsis
```
#include "petscbag.h"   
PetscErrorCode PetscBagRegisterReal(PetscBag bag, void *addr, PetscReal mdefault, const char *name, const char *help)
```
Logically Collective on bag


## Input Parameters

- ***bag -*** the bag of values
- ***addr -*** location of double in struct, for example `&params->r`
- ***mdefault -*** the initial value
- ***name -*** name of the variable
- ***help -*** longer string with more information about the value





## See Also
 `PetscBag`, `PetscBagSetName()`, `PetscBagView()`, `PetscBagLoad()`, `PetscBagGetData()`
`PetscBagRegisterInt()`, `PetscBagRegisterBool()`, `PetscBagRegisterScalar()`
`PetscBagSetFromOptions()`, `PetscBagCreate()`, `PetscBagGetName()`, `PetscBagRegisterEnum()`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/classes/bag/bag.c.html#PetscBagRegisterReal">src/sys/classes/bag/bag.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/tutorials/ex5.c.html">src/sys/tutorials/ex5.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/tutorials/ex5f90.F90.html">src/sys/tutorials/ex5f90.F90.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/ex7.c.html">src/dm/tutorials/ex7.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex36.c.html">src/snes/tutorials/ex36.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex69.c.html">src/snes/tutorials/ex69.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex71.c.html">src/snes/tutorials/ex71.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex76.c.html">src/snes/tutorials/ex76.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex76.c.html">src/ts/tutorials/ex76.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex77.c.html">src/ts/tutorials/ex77.c.html</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/classes/bag/bag.c)


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