Method angle

src/org/opensourcephysics/numerics/Vec3D.java:151–160

Returns the angle in radians between this vector and the vector parameter; the return value is constrained to the range [0,PI]. @param v1 the other vector @return the angle in radians in the range [0,PI]

(Vec3D v1)

   *    @return   the angle in radians in the range [0,PI]
   */
  public final double angle(Vec3D v1) {
    double vDot = this.dot(v1)/(this.magnitude()*v1.magnitude());
    if(vDot<-1.0) {
      vDot = -1.0;
    }
    if(vDot>1.0) {
      vDot = 1.0;
    }
    return((Math.acos(vDot)));
  }

}