bilinear, an R library which evaluates a bilinear interpolant.
The computer code and data files on this web page are distributed under the cmna license.
bilinear is available in an R version.
linterp, an R library which computes the intercept and slope of the line through two points.
pwiselinterp, an R library which finds the intercept and slope for a sequence of piecewise linear interpolants.
Original R code by James Howard; Modifications by John Burkardt.