Variable Name
Size
Description
ifbody
int
Sequential id of FFlex body defined in RecurDyn/Solver. This is a related argument with the 5th argument of Nodal_Force_Ext subroutine.
NodeSeq
int
Node sequential id defined in RecurDyn/Solver. This is a related argument with the 6th argument of Nodal_Force_Ext subroutine.
MKID
int [2]
An array of integer type. Each value should be zero or a marker id. 1st value is defined as base marker. 2nd value is defined as reference marker.
nMK
int
An integer variable for considering base and reference marker. If nMK is 0, then the subroutine returns a global velocity vector of NodeSeq. If nMK is 1, then the subroutine calculates a velocity vector considering base marker. If nMK is 2, then the subroutine calculates a velocity vector considering base and reference marker.
Vel
double [3]
An array of double precision type. The array size must be 3. 3 values mean a relative velocity vector.
Where, 
is a orientation
matrix of the reference marker (=MKID[1] ). 
is a global position
vector of NodeSeq. 
is a global
position vector of the base marker (=MKID[0]).
Errflg
int
Error flag.
If the result of this argument is -1 (means TRUE in Fortran logical value), there is no error.
The others mean that there is an error.