Question

Anyone know how to do interpolation (preferably cubic spline) from a pc? Either with excel or a free download?

Answer 1

This will help you - http://www.wolframalpha.com/input/?i=cubic+interpolation&f1=%7B20.9%2C+23.2%2C+26.2%2C+26.4%2C+16.3%2C+-12.2%2C+-60.6%2C+-128.9%7D&f=CubicFitCalculator.data%5Cu005f%7B20.9%2C+23.2%2C+26.2%2C+26.4%2C+16.3%2C+-12.2%2C+-60.6%2C+-128.9%7D&a=*FVarOpt-_**CubicFitCalculator.data2--

Answer 2

Thank you. I didn't see any interpolation option. It fit my curve just like I did in excel with the trendline function, but I don't see how to interpolate with it.