Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

Contents

mkl_graph_matrix_set_csr

Updates a graph matrix with the data in CSR format.

Syntax

mkl_graph_status_t
mkl_graph_matrix_set_csr (mkl_graph_matrix_t
A
,
int64_t
nrows
,
int64_t
ncols
,
void
*rows_start
,
mkl_graph_type_t
rows_start_type
,
void
*col_indx
,
mkl_graph_type_t
col_indx_type
,
void
*values
,
mkl_graph_type_t
values_type
);
Include Files
  • mkl_graph.h
Description
The
mkl_graph_matrix_set_csr
 routine updates CSR data (in the 3-array variation) associated with a graph matrix
A
. All arguments except the input graph matrix
A
 and the matrix dimensions
nrows
 and
ncols
 are optional and will not be used if they are not set. This means that if NULL is passed for one of the CSR arrays
rows_start
,
col_indx
 or
values
, this argument, as well as the corresponding argument of type
mkl_graph_type_t
, will be ignored.
The library assumes any buffers passed as arguments to
mkl_graph_?_set_?
 routines persist for the life of the input graph object or until the next call to an
mkl_graph_?_set_?
 routine for an existing format. Calling a set routine on an existing format resets the data of the graph object to the new data. After destroying the graph object or resetting its data, you can safely deallocate data used as input to an
mkl_graph_?_set_?
 routine.
Intel® oneAPI Math Kernel Library
 never deallocates user-allocated memory.
Refer to Sparse Matrix Storage Formats for further details on the CSR format.
The graph matrix must be created via a call to
mkl_graph_matrix_create
 before calling
mkl_graph_matrix_set_csr
.
If the matrix already has the specified format on entry to the routine, the existing data is replaced by the new data and existing internal optimized data is deallocated. To create new optimized data after changing the matrix data, call a corresponding
mkl_graph_optimize_?
 routine.
Input Parameters
A
A graph matrix to be modified.
nrows
Number of rows in the matrix.
ncols
Number of columns in the matrix.
rows_start
A pointer to the start of the
rows_start
 array. The array must be of length at least (
nrows
+
1
). The array contains row indices such that
rows_start
[
i
] is the index of the first non-zero entry in row
i
 in the arrays
col_indx
 and
values
. Or, in other words,
rows_start
[
i+1
] -
rows_start
[
i
] is always the number of non-zero elements in row
i
 and the value
rows_start
[
nrows
]-
rows_start
[
0
] should be the total number of non-zero entries in the matrix. The type of the array elements is derived from the
rows_start_type
 argument.
Ignored if NULL.
Refer to
pointerB
 array description in CSR Format for more details.
rows_start_type
Type of the elements in
rows_start
 array. Refer to Graph API Glossary for a list of possible options. Ignored if
rows_start
 is NULL.
col_indx
A pointer to the start of the
col_indx
 array. The array must be of length at least
rows_start
[
nrows
]-
rows_start
[
0
]. The array contains zero-based column indices for the non-zero entries of the matrix
A
. The type of the array elements is derived from the
col_indx_type
 argument. Ignored if NULL.
Refer to
columns
 array description in CSR Format for more details.
col_indx_type
Type of the elements of
col_indx
 array. Refer to Graph API Glossary for a list of possible options. Ignored if
col_indx
 is NULL.
values
A pointer to the start of the
values
 array. The array must be of length at least
rows_start
[
nrows
]-
rows_start
[
0
]. The array contains values for the non-zero entries of the matrix
A
. The type of the array elements is derived from the
values_type
 argument. Ignored if NULL.
Refer to
values
 array description in CSR Format for more details.
values_type
Type of the elements of the
values
 array. Refer to Graph API Glossary for a list of possible options. Ignored if NULL is passed for
values
.
Output Parameters
A
A graph matrix with the updated data in CSR Format.
Return Values
The function returns a value indicating whether the operation was successful or not and why. Refer to Graph API Glossary for a list of possible options.
Product and Performance Information
Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.
Notice revision #20201201

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.