MSparseArray_getExplicitPositions （C 函数）
is a library callback that puts an MTensor containing the explicitly specified positions from s into 
.
LibraryLink`
MSparseArray_getExplicitPositions （C 函数）
is a library callback that puts an MTensor containing the explicitly specified positions from s into 
.
更多信息
- Used in C/C++ code in a library function called from the Wolfram Language.
- A nonzero error code value will be returned if there is not sufficient memory.
- The destination
should either be null (0) or an MTensor allocated with MTensor_new. - If
is null, then a new MTensor is created. - If
is an allocated MTensor, then the data in 
will be modified. - The result
will be an empty MTensor or an MTensor of rank 2 with integer type. The first dimension is the number of explicit positions; the second dimension is equal to the the rank of s.