2013

Options for Splines with Fit Points
The following options are specific to the fit point method.
Knots Specifies the knot parameterization, one of several computational methods
that determines how the component curves between successive fit points
within a spline are blended. (
SPLKNOTS (page 1489) system variable)
 Chord (or Chord-Length method). Spaces the knots connecting each
component curve to be proportional to the distances between each
associated pair of fit points. An example is the green curve in the
illustration.
 Square Root (or Centripetal method). Spaces the knots connecting each
component curve to be proportional to the square root of the distance
between each associated pair of fit points. This method usually produces
“gentler” curves. An example is the blue curve in the illustration.
 Uniform (or Equidistant method). Spaces the knots of each component
curve to be equal, regardless of the spacing of the fit points. This method
often produces curves that overshoot the fit points. An example is the
magenta curve in the illustration.
Start Tangency Specifies a tangent condition on the starting point of the
spline.
S Commands | 1025