petsc-3.14.5 2021-03-03
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# MatDenseCUDAPlaceArray

Allows one to replace the GPU array in a dense matrix with an array provided by the user. This is useful to avoid copying an array into a matrix

### Synopsis

    #include "petscmat.h"
    PetscErrorCode  MatDenseCUDAPlaceArray(Mat mat,const PetscScalar *array)

Not Collective

### Input Parameters

| mat | - the matrix
| array | - the array in column major order

### Notes

You can return to the original array with a call to MatDenseCUDAResetArray(). The user is responsible for freeing this array; it will not be freed when the matrix is destroyed. The array must have been allocated with cudaMalloc().

### See Also

MatDenseCUDAGetArray(), MatDenseCUDAResetArray()

### Level

developer

### Location

src/mat/impls/dense/mpi/mpidense.c

### Implementations

MatDenseCUDAPlaceArray_MPIDenseCUDA in src/mat/impls/dense/mpi/mpidense.c
MatDenseCUDAPlaceArray_SeqDenseCUDA in src/mat/impls/dense/seq/cuda/densecuda.cu
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