Descriptor

The <descriptor> field defines object description method (see Object Description) and contains the following symbols:

S	Standard description.
P	Pointer description.
L	Layout description.

The default for Intel IPP matrix operating functions is the Standard description method.

Practically all IPP MX function names have one descriptor symbol or no descriptor at all, which allows them to be specified by Standard object description. The only exception is Copy functions that can copy data from one description to another. Copy function name contains two descriptors to define the source and the destination description methods.

If IPP MX function name has the L descriptor, while the function itself operates not only on matrix and vector arrays, but also on single matrices (vectors), then the single matrix or vector must be described by Standard method, since the Layout method does not work on single objects.