Format

Description

The SHF function evaluates a simple harmonic function at a specific value .

Example

<Motion_Joint

      id              = "301001"
      type            = "EXPRESSION"
      val_type        = "D"
      expr            = "SHF(TIME,0,2,2,0,0)"

      joint_id        = "10003"

      joint_type      = "R"

 
/>

Arguments

Any valid expression used as an independent variable for the Simple Harmonic Function (SHF).  For example, to use the z-displacement of I marker with respect to the J marker as resolved in the reference frame of the RM marker as the independent variable, specify as DZ({marker_i.idstring}, {marker_j.idstring}, {marker_rm.idstring}).

The independent variable offset.

The amplitude of the simple harmonic function.

The frequency of the simple harmonic function.  It is assumed to be specified in radians per unit of the independent variable unless a D is used after the value.

A phase shift in the simple harmonic function.  It is assumed to be in radians unless a D is used after the value.

The average value of the simple harmonic function.

Definition