pchip_test

pchip_test, a FORTRAN77 code which calls pchip(), which constructs a piecewise cubic Hermite interpolant to data, and carry out various related operations, by Fred Fritsch.

Licensing:

The computer code and data files made available on this web page are distributed under the GNU LGPL license.

Related Data and Programs:

pchip, a FORTRAN77 code which can construct a piecewise cubic Hermite interpolant to data, and carry out various related operations, by Fred Fritsch.

Source Code:

• pchip_test.f, a sample calling program.
• pchip_test.sh, BASH commands to compile and run the sample program.
• pchip_test.txt, the output file.

TEST02 generates some files that can be input to GNUPLOT to illustrate the problem of interpolating monotonic data with a piecewise cubic Hermite spline.

• test02_commands.txt, input commands to GNUPLOT.
• test02_data.txt, specifies the data to be interpolated.
• test02_interp.txt, samples the interpolant at many points.
• test02.png, a PNG version of the plot.

TEST03 generates some files that can be input to GNUPLOT to illustrate the problem of interpolating monotonic data with a cubic spline.

• test03_commands.txt, input commands to GNUPLOT.
• test03_data.txt, specifies the data to be interpolated.
• test03_interp.txt, samples the interpolant at many points.
• test03.png, a PNG version of the plot.