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INTERP2

Calls the MATLAB INTERP2 function and returns a real array. Given a 3D surface described by x, y, and z, the INTERP2 function returns the Zi values corresponding to the Xi and Yi points.

Format

INTERP2 (x, y, z, Xi, Yi method)

Argument

 
x
The x values of the input surface.
y
The y values of the input surface.
z
The z values of the input surface.
Xi
Evaluates the splined curves at the x coordinates.
Yi
Evaluates the splined curves at the y coordinates.
Xi and Yi may be of different size, as they describe a grid rather than a collection of ordered pairs, though the number of Xi's must be greater than or equal to the number of Yi's.
method
A character string that indicates the interpolation method to be used. These come directly from the MATLAB function of the same name:
nearest - Nearest neighbor interpolation.
linear - Bilinear interpolation.
spline - Cubic spline interpolation.
cubic - Bicubic interpolation.

Example

Note that the z array is a surface corresponding to each x-y pair:
variable create variable=Zi &
real=(interp2({1,2,3},{1,2,3},{{1,2,3},{1,2,3},
{1,2,3}},{1.5,2.5},{1.5,2.5},"spline"))
produces value for ZI
{1.5,2.5,1.5,2.5}
corresponding to the points
  (1.5,1.5,1.5)
  (1.5,2.5,2.5)
  (2.5,1.5,1.5)
  (2.5,2.5,2.5)
Learn more about matrix/array functions.