Akima Interpolation

Interpolate smooth curve through given points on a plane.

Description

Implementation of Akima's univariate interpolation method (Journal of the ACM, Vol. 17, No. 4, October 1970, pages 589-602).

N. Shamsundar, University of Houston

• MATLAB release: MATLAB 6.0 (R12)
• Other requirements: Works with Matlab Versions 3 and upwards.
• Other Files: akima.m, ; AkimaTst.m

[jesper dietz]

jeo it works nice

[Catherine Martel]

Hello,

I'm trying to get in touch with Jesper Dietz. The Jesper I'm looking for was crazy about sailing but sold his boat in order to go to Switzerland for a year, learn French, ski and have a fabulous time with new friends. Unfortunately, we've lost touch over the years and I'm now trying to reconnect. If you happen to be this Jesper or know him, please write back....

Cheers,

Catherine Martel

[Heyjin Kim]

It works great for interpolation of ocean temperature and salinity profiles. Thanks!

[ericka solano]

good

[Johannes Korsawe]

Great work! Besides, the routine can be accelerated a lot by using the lines

[nerd,bin]=histc(xi,x);bin=min(bin,n-1);
bb=bin(1:length(xi))';wj=xi-x(bb);yi=((wj.*d(bb) +c(bb)).*wj+b(bb)).*wj+y(bb);

instead of the loop at the end. Speed-Up of 500 for 50.000 interpolated points.

Best,
Johannes Korsawe

[Zeke Cummings]

With the Korsawe comment it's a 5 star function. More useful than Akima's orginal fortran algorithm

[mehdi ravanbakhsh]

very good

[Jeff Barton]

Excellent! Excellent! Excellent! I was looking for this exact capability, and the routine performed beautifully. Thank you!

[Kosit Tea]

Very Excellent

[Chris]

Works well, It easily be made compatible with the ppval function too.