ndd_projection, ndd_multi

ndd_projection, ndd_multi_projection

Synopsis

#include "lash-ndd.h" ndd *ndd_projection(ndd *nd, uint4 p); ndd *ndd_multi_projection(ndd *nd, uint4 p, uint4, u);

The function ndd_projection computes an NDD representing the projection of the set represented by the NDD *nd over all the vector components but the one of index p (the first vector component has the index 0). The function ndd_multi_projection computes an NDD representing the projection of the set represented by the NDD *nd over all the vector components but the ones that are equal to u modulo p. The dimension of *nd must be at least equal to 1 and, for the function ndd_multi_projection, must be an integer multiple of p. These functions are only currently implemented for NDDs that operate serially.

These functions do not modify *nd.

Return values

In the case of success, these functions return a pointer to a newly created NDD. In the case of an error, they return a NULL pointer and set lash_errno.

Diagnostics

LASH_ERR_NOT_INIT: The package has not been initialized.
LASH_ERR_DIMENSION: Dimension mismatch.
LASH_ERR_BAD_VALUE: Invalid parameter value.
LASH_ERR_NOT_IMPL: Not (yet!) implemented.
LASH_ERR_BAD_TYPE: Bad type of NDD.
LASH_ERR_NO_MEM: Insufficient memory.
LASH_ERR_CORRUPT: Corrupt NDD.