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INTERP1

Similar to the MATLAB INTERP1 function and returns a real array. Given a curve described by x and y, the INTERP1 function returns the Yi values corresponding to the Xi values.

Format

INTERP1 (x, y, Xi, method)

Argument

 
x
The x values of the input curve.
y
The y values of the input curve.
Xi
The x values at which to evaluate the spline.
method
A character string that indicates the interpolation method to be used. These come directly from the MATLAB function with the same name:
nearest - Nearest neighbor interpolation.
linear - Linear interpolation.
spline - Cubic spline interpolation
pchip - Piecewise cubic Hermite interpolation.
cubic - Same as pchip.
Note: Not all method options of the MATLAB function with same name are supported by this function.

Example

This example shows the relative shapes of the arrays involved when using the function:
variable create variable=Yi & real=(interp1({1,2,3},
   {1,2,3}, {1.2,2.5}, "spline"))
produces a value for Yi of
{1.25,2.5}
corresponding to the points
(1.5,1.5)(2.5,2.5)
Learn more about matrix/array functions.