NCL Website header
NCL Home> Application examples> Data Analysis || Data files for some examples

Example pages containing: tips | resources | functions/procedures

Interpolators for one-dimensional curves

This page describes using routines from the Fitgrid package - a package containing 1D and 2D interpolators using cubic splines under tension.
interp1d_1.ncl: Demonstrates the use of:
  • ftcurv Calculates an interpolatory spline through a sequence of functional values.
  • ftcurvd - Calculates the derivatives of an interpolatory spline under tension.
  • ftcurvi - Calculates integrals of an interpolatory spline under tension between two user-specified limits.
scatter_9.ncl: Demonstrates how to use lspoly to calculate a least-squares polynomial fit through a random set of points.
interp1d_2.ncl: Demonstrates different tension smoothing values applied to ftcurv, via the "sig" parameter set with ftsetp.
interp1d_3.ncl: Demonstrates the use of lspoly to calculate a least-squares polynomial fit through the same curve as the previous example.