###### Tag: Interpolation

I just released some updates to my two most popular Fortran libraries on GitHub: JSON-Fortran and bspline-fortran. Coincidently, both are now at v5.2.0. Details of the updates are: JSON-Fortran There are several new features in this release. The biggest update

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## Multidimensional Linear Interpolation (Part 2)

In an earlier post, I mentioned that we needed an object-oriented modern Fortran library for multidimensional linear interpolation. Well, here it is. I call it finterp, and it is available on GitHub. It can be used for 1D-6D interpolation/extrapolation of data on a regular

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## Multidimensional Linear Interpolation

Some years ago, I needed a Fortran routine to do linear interpolation of a multidimensional (up to 6D) data set. Not wanting to reinvent the wheel, I ended up using a routine called FINT from CERNLIB (documentation here). It is written in Fortran 66, and

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## B-Spline Fortran 4.0

My bspline-fortran multidimensional interpolation library is now at version 4.0. The documentation can be found here. Since I first mentioned it here, I’ve made many updates to this library, including: Added object-oriented wrappers to the core routines. The user now has the choice to use the

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## Lagrange Interpolating Polynomials

A simple Fortran implementation of interpolation by Lagrange polynomials is given below. Though named after Joseph-Louis Lagrange, the formula was first discovered by English mathematician Edward Waring. Examples of interpolating polynomials for the  function are shown here for different numbers of points , , etc.

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## Multidimensional B-Spline Interpolation

I just started a new modern Fortran software library called bspline-fortran, which is for multidimensional (multivariate) b-spline interpolation of data defined on a regular grid. It is available on GitHub, and released under a permissive BSD-style license. It seems impossible to find

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