# DMTSCreateRHSMassMatrixLumped
This creates the lumped mass matrix associated with the given `DM`, and a solver to invert it, and stores them in the `DM` context. 
## Synopsis
```
#include "petscts.h" 
PetscErrorCode DMTSCreateRHSMassMatrixLumped(DM dm)
```
Collective on dm


## Input Parameters

- ***dm   -*** `DM` providing the mass matrix





## Note
The idea here is that an explicit system can be given a mass matrix, based on the `DM`, which is inverted on the RHS at each step.
Since the matrix is lumped, inversion is trivial.


## See Also
 [](chapter_ts), `DM`, `DMTSCreateRHSMassMatrix()`, `DMTSDestroyRHSMassMatrix()`, `DMCreateMassMatrix()`, `DMTS`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/utils/dmlocalts.c.html#DMTSCreateRHSMassMatrixLumped">src/ts/utils/dmlocalts.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex45.c.html">src/ts/tutorials/ex45.c.html</A><BR>


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