HiPPIS is a polynomial-based data-bounded and positivity-preserving interpolation software for function approximation and mapping data values between structure (uniform and nonuniform) meshes.

• Matlab is required for the version of the software implemented in Matlab. No special toolboxes are required. The core files used for the implementation of the data-bounded and positivity-preserving interpolation methods are in the folder Src. The folder structure for the Malab version is as follows:

  Matlab
  |  Src
  |  |  adaptiveInterpolation1D.m
  |  |  adaptiveInterpolation2D.m
  |  |  adaptiveInterpolation3D.m
  |  |  divdiff.m
  |  |  newtonPolyVal.m
  |  Drivers
  |  |  Tutorial
  |  |  |  main.m
  |  |  |  testing.m 
  |  |  Mapping 
  |  |  |  main.m
  |  Extras
  |  |  ...

The remaining folders and files in the folder Matlab are drivers, examples, data, and scripts for using the data-bounded and positivity-preserving interpolation methods.

• The Fortran version requires the installation of Intel (ifort), or gnu (gfortran) compilers with OpenMP4. The vectorized version of the code required the use of Intel compilers. The Make files Fortran/Drivers/Mapping/Makefile and Fortran/Drivers/BOMEX/Makefile can be modified for different compilers including Intel, gnu, HPE cray. The core files used for the implementation and demo of the data-bounded and positivity-preserving interpolation methods are in the folder Src. The folder structure for the Matlab version is as follows:

  Fortran
  |  Src
  |  |  mod_adaptiveInterpolation.F90
  |  |  MExFiles
  |  |  |  apdaptiveInterpolation1D.F90
  |  |  |  apdaptiveInterpolation2D.F90
  |  |  |  apdaptiveInterpolation3D.F90
  |  Drivers
  |  |  Tutorial
  |  |  |  main.F90
  |  |  |  testing.F90
  |  |  |  main.m
  |  |  Mapping
  |  |  |  main.F90
  |  |  BOMEX
  |  |  |  main.F90
  |  Extras
  |  |  ...

The remaining folders and files in the folder Fortran are drivers, examples, data, and scripts for using the data-bounded and positivity-preserving interpolation methods.

• Downloading HiPPIS (Matlab and/or Fortran) is sufficient for installation.

• Matlab

Open Matlab and run the script tutorial.m in folder Matlab.

 cd Matlab/Drivers/Tutorial/
 main

• Fortran

cd Fortran/Drivers/Tutorial/
make 
./main

The file main.m (in Matlab/Drivers/Tutorial) or main.m or main.F90 (in Fortran/Drivers/Tutorial) is a good place to start. Both main.m or main.F90 provide simple examples showing how to use HiPPIS with 1D, 2D, and 3D structured tensor product meshes.

More examples can be found in /Matlab/Drivers/Mappin/main.m or /Fortran/Drivers/Mapping/main.F90. These examples are used to produce the results presented in a manuscript submitted for publication that is entitled "Algorithm xxxx: HiPPIS: A High-Order Positivity-Preserving Mapping Software for Mtructured Meshes". Each example produces results that are saved in files. The saved data are then used to calculate the errors and produce the figures and tables in the manuscript.

Note: Producing the results in the Manuscript takes a few hours because 1) the PDE problem in folder BOMEX is executed multiple times and uses a small time step, 2) the 2D approximation examples are executed multiple times and use 1000x1000 output mesh.

cd Matlab/Mapping
main

The driver for the examples is /Matlab/Drivers/Mapping/main.m.

cd Fortran/Extras/
sh run_manuscript_examples.sh

Open the Matlab software and run

plot_manuscript_examples

The drivers for the examples are Fortran/Drivers/Mapping/main.F90 and Fortran/Drivers/BOMEX/main.F90.

Supplemental tests are provided in the files Mapping/Drivers/Tutorial/testing.m and Fortran/Drivers/Tutorial/testing.F90