There is a standard set of rotation matrices which are defined by ROTM titles as shown in the example below. The definition includes a keyword and rotation parameters as defined for the input parameters for the routine GSROTM:
*DO ROTM 1 -A4CW -C1/80 #.Title for CMS 8 created on 940722 at 1159
#. Thet1 Phi1 Thet2 Phi2 Thet3 Phi3
:000D 90.0 0.0 90.0 90.0 0.0 0.0 #. (x,y,z) => ( x, y, z)
:180X 90.0 0.0 90.0 -90.0 180.0 0.0 #. (x,y,z) => ( x,-y,-z)
:XZXD 90.0 0.0 90.0 270.0 0.0 0.0 #. (x,y,z) => ( x,-y, z)
...
The full list of available standard matrices with their definition is given in Appendix A.4.
Access to the index of a standard matrix can be done via call
CALL DCROTM (CNAME, IROTM*)where CNAME is the keyword specifying the rotation matrix to be chosen. The key word ``NULL'' is reserved to null rotation which yields the rotation matrix index IROTM to be 0.
In the context of ``GEAN'' style of defining parameters (see next section), the keyword ``ROTM'' followed by ``NEXT'' reserves the next rotation matrix and this will be used in subsequent ``POS'' or ``POSP'' requests which uses the keyword ``NEXT'' or ``LAST'' for the rotation matrix.