PetscMalloc1 — PETSc 3.21.4 documentation

Skip to main content
`Ctrl`+`K`

# PetscMalloc1

Allocates an array of memory aligned to `PETSC_MEMALIGN`

## Synopsis

    #include <petscsys.h>
    PetscErrorCode PetscMalloc1(size_t m1,type **r1)

Not Collective

## Input Parameter

- m1 - number of elements to allocate (may be zero)

## Output Parameter

- r1 - memory allocated

## Note

This uses the sizeof() of the memory type requested to determine the total memory to be allocated, therefore you should not multiply the number of elements requested by the `sizeof()` the type. For example use

      PetscInt *id;
      PetscMalloc1(10,&id);

not

      PetscInt *id;
      PetscMalloc1(10*sizeof(PetscInt),&id);

Does not zero the memory allocated, use `PetscCalloc1()` to obtain memory that has been zeroed.

## See Also

`PetscFree()`, `PetscNew()`, `PetscMalloc()`, `PetscCalloc1()`, `PetscMalloc2()`

## Level

beginner

## Location

include/petscsys.h

## Examples

src/dm/impls/plex/tutorials/ex6.c
src/dm/field/tutorials/ex1.c
src/dm/tutorials/swarm_ex1.c
src/dm/tutorials/ex6.c
src/dm/tutorials/swarm_ex3.c
src/dm/impls/stag/tutorials/ex4.c
src/dm/tutorials/ex20.c
src/dm/impls/plex/tutorials/ex10.c
src/dm/tutorials/ex26.c
src/ksp/ksp/tutorials/ex21.c

Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages