MPI_TYPE_CREATE_SUBARRAY(ndims, array_of_sizes, array_of_subsizes,
array_of_starts, order, oldtype, newtype)
int MPI_Type_create_subarray(int ndims, int array_of_sizes[], int array_of_subsizes[], int array_of_starts[], int order, MPI_Datatype oldtype, MPI_Datatype *newtype)
MPI_TYPE_CREATE_SUBARRAY(NDIMS, ARRAY_OF_SIZES, ARRAY_OF_SUBSIZES, ARRAY_OF_STARTS, ORDER, OLDTYPE, NEWTYPE, IERROR)INTEGER NDIMS, ARRAY_OF_SIZES(*), ARRAY_OF_SUBSIZES(*), ARRAY_OF_STARTS(*), ORDER, OLDTYPE, NEWTYPE, IERROR
int MPI::Datatype::Create_subarray(int ndims, const int array_of_sizes[], const int array_of_subsizes[], const int array_of_starts[], int order) const
MPI::Datatype
The subarray type constructor creates an MPI-/ datatype describing an n-dimensional subarray of an n-dimensional array. The subarray may be situated anywhere within the full array, and may be of any nonzero size up to the size of the larger array as long as it is confined within this array. This type constructor facilitates creating filetypes to access arrays distributed in blocks among processes to a single file that contains the global array.
This type constructor can handle arrays with an arbitrary number of dimensions and works for both C and Fortran ordered matrices (i.e., row-major or column-major). Note that a C program may use Fortran order and a Fortran program may use C order.
The ndims parameter specifies the number of dimensions in the full data array and gives the number of elements in array_of_sizes, array_of_subsizes, and array_of_starts.
The number of elements of type oldtype in
each dimension of the n-dimensional array and the
requested subarray are specified by
array_of_sizes and array_of_subsizes,
respectively.
For any dimension , it is erroneous to specify
array_of_subsizes[i]
1 or
array_of_subsizes[i]
array_of_sizes[i].
The array_of_starts contains the
starting coordinates of each
dimension of the subarray.
Arrays are assumed to be indexed starting from zero.
For any dimension , it is erroneous to specify
array_of_starts[i]
0 or
array_of_starts[i]
(array_of_sizes[i]
array_of_subsizes[i]).
The order argument specifies the storage order for the subarray as well as the full array. It must be set to one of the following:
A ndims-dimensional subarray (newtype) with no extra padding can be defined by the function Subarray() as follows:
Let the typemap of oldtype have the form:
MPI-Standard for MARMOT