About Creating Datum Points, Datum Curve, and a Datum Coordinate System
You can create datum points from the PTC Mathcad Prime output variables and a datum curve passing through the created datum points. You can also create a datum coordinate system as a result of a PTC Mathcad Prime analysis feature. When one or more PTC Mathcad output variables consist of nx3 matrices, where n specifies the total number of points to be created, you can create datum points. When one or more PTC Mathcad Prime output variables consist of 3x4 matrices, you can create a datum coordinate system.
Datum points, a datum curve, and a datum coordinate system are created when Create in the Result datums window is set to YES while defining the PTC Mathcad Prime analysis feature. Create is set to YES by default. You must specify a reference coordinate system with respect to which the output datum points, the datum curve, and the datum coordinate system are created. The reference coordinate system is referred to as the parent of the PTC Mathcad Prime analysis feature.
The default names for the datum points created by the PTC Mathcad Prime analysis feature are in the format ptc mathcadvariablename_fid_#, where
• ptc mathcadvariablename is the name of the PTC Mathcad Prime variable
• fid is the PTC Mathcad Prime analysis feature ID
• # is a counter
You can also modify the default names of the created datum points, in which case the names are in the format userdefinedname_fid_#.
For the following PTC Mathcad Prime output matrix, the default names of the datum points are PX_138_1, PX_138_2, ...PX_138_7, where 138 is the ID of the created PTC Mathcad Prime analysis feature.
You can create a datum curve passing through the PX_138_1, PX_138_2, ...PX_138_7 datum points.
The default name of the datum coordinate system created by the PTC Mathcad Prime analysis feature is in the format ptc mathcadvariablename_fid. You can modify the default name of the created datum coordinate system, in which case its name is in the format userdefinedname_fid.
For the following PTC Mathcad Prime output matrix shown below, the default name of the datum coordinate system is CSYS_138, where 138 is the ID of the created PTC Mathcad Prime analysis feature.
The first three columns in this 3x4 matrix define vectors in the direction of the X, Y, and Z axes of the coordinate system. These vectors need not be unit vectors. The fourth column defines the origin of the coordinate system.
