cubic spline "fit" and interpolation of tabular data

11222022, 10:37 AM
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cubic spline "fit" and interpolation of tabular data
This HP Prime program demonstrates how to interact with cubic spline subroutines which "fit" and interpolate twodimensional tabular data of the form y = f(x).
The following statement defines the total number of xy data pairs // define number of x and y data pairs EXPORT ndata := 168; The x and y data pairs are provided by the user in EXPORT data statements of the form // xdata array (calendar date) EXPORT xdata :=[1994.917,1995.0004,1995.0836,1995.167,1995.2504,1995.3336,1995.417,1995.5004,1995.5836,1995.667, ..... // ydata array (solar flux) EXPORT ydata := [80.4,79.6,78.8,78.2,77.7,77.3,76.7,76,75.3,74.5,73.7,73.2,72.9,72.5,72.3,72.2,72.1,72.1,72.3,72.6,72.9, ..... The user provides the x value for interpolation in a statement with the following format xval := 2006.0; The software and documentation for this program can be downloaded from https://www.dropbox.com/s/bd4ml7xc3j3gr1...t.zip?dl=0 

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