Thu Feb 27 08:25:52 2020 

bilinear_test
  R version 3.4.4 (2018-03-15) 
  bilinear computes the intercept and slope of the line through two points.


  x:

[1] 4 7

  y:

[1] 2 4

  z:

     [,1] [,2]
[1,]   28   34
[2,]   31   35

  xnew:

[1] 2.5 3.0 3.5

  ynew:

[1] 5.0 5.5 6.0

  znew <- bilinear ( x, y, z, xnew, ynew )

[1] 31.00000 32.41667 33.66667

bilinear_test
  Normal end of execution.
Thu Feb 27 08:25:52 2020