smooth.spline Function (GPL)

Syntax

smooth.spline(<algebra>)

<algebra>. Graph algebra, such as x*y. Refer to Brief Overview of GPL Algebra for an introduction to graph algebra.

Description

Calculates the cubic spline for the data. You should use a cubic spline curve only when you believe there is no error in your data.

Examples

Figure 1. Example: Creating a cubic spline curve

ELEMENT: line(position(smooth.spline(salbegin*salary)))