jacobwilliams / Finterp
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Multidimensional Linear Interpolation with Modern Fortran
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Programming Languages
fortran
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finterp
Status
Description
Can be used to perform multidimensional (1D-6D) linear interpolation of data on a regular grid. The code is written in modern Fortran (2003/2008) and is object-oriented and thread safe.
Usage
There are six classes (linear_interp_1d, linear_interp_2d, linear_interp_3d, linear_interp_4d, linear_interp_5d, and linear_interp_6d). Each has three methods: initialize, evaluate, and destroy.
real(wp) :: x(nx),y(ny),z(nz),q(nq),r(nr),s(ns)
real(wp) :: fcn_1d(nx)
real(wp) :: fcn_2d(nx,ny)
real(wp) :: fcn_3d(nx,ny,nz)
real(wp) :: fcn_4d(nx,ny,nz,nq)
real(wp) :: fcn_5d(nx,ny,nz,nq,nr)
real(wp) :: fcn_6d(nx,ny,nz,nq,nr,ns)
real(wp) :: xval,yval,zval,qval,rval,sval,fval
integer :: iflag
type(linear_interp_1d) :: s1
type(linear_interp_2d) :: s2
type(linear_interp_3d) :: s3
type(linear_interp_4d) :: s4
type(linear_interp_5d) :: s5
type(linear_interp_6d) :: s6
!populate the arrays
!...
!initialize the class:
call s1%initialize(x,fcn_1d,iflag)
call s2%initialize(x,y,fcn_2d,iflag)
call s3%initialize(x,y,z,fcn_3d,iflag)
call s4%initialize(x,y,z,q,fcn_4d,iflag)
call s5%initialize(x,y,z,q,r,fcn_5d,iflag)
call s6%initialize(x,y,z,q,r,s,fcn_6d,iflag)
!interpolate:
call s1%evaluate(xval,fval)
call s2%evaluate(xval,yval,fval)
call s3%evaluate(xval,yval,zval,fval)
call s4%evaluate(xval,yval,zval,qval,fval)
call s5%evaluate(xval,yval,zval,qval,rval,fval)
call s6%evaluate(xval,yval,zval,qval,rval,sval,fval)
!free memory:
call s1%destroy()
call s2%destroy()
call s3%destroy()
call s4%destroy()
call s5%destroy()
call s6%destroy()
Nearest Neighbor Interpolation
The library also includes classes for nearest neighbor interpolation (nearest_interp_1d, nearest_interp_2d, ...). The interfaces are the same as for the linear classes.
Documentation
The latest API documentation can be found here. This was generated from the source code using FORD (note that the included build.sh script will also generate these files).
License
The finterp source code and related files and documentation are distributed under a permissive free software license (BSD-style).
See also
- bspline-fortran, if you need B-spline interpolation.
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