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Spherical Harmonics

version 2.0.1 (249 KB) by Javier Montalt Tordera
Compute spherical harmonic functions.

35 Downloads

Updated 28 Apr 2020

GitHub view license on GitHub

This contribution includes a single MATLAB function ('harmonicY') that computes spherical harmonics of any degree and order, evaluated at arbitrary inclination, azimuth and radius. Capabilities include the computation of surface/solid, complex/real and normalized/unnormalized spherical harmonics.

Documentation is provided in the form of a live script with examples, as well as an HTML page for convenience and/or compatibility.

Cite As

Javier Montalt Tordera (2020). Spherical Harmonics (https://github.com/jmontalt/harmonicY/releases/tag/v2.0.1), GitHub. Retrieved .

Comments and Ratings (8)

Hi @Thamid Opi, thank you for pointing this out. Negative m, or sine type, harmonics could be previously obtained using the option 'type', but I believe it was a confusing design. I have uploaded a new version which should work as you expect. Just remember to set the option 'type' to 'real'. I also updated the example in doc.mlx accordingly. I hope this will help.

Thamid Opi

This is great but was curious if it would be possible to plot negative order? When you input a negative value for m, it just outputs the positive m plot.

Thank you! Your program helped me a lot with my project.

Good job!

Hi Yunus, thank you for your message. I am not sure if I understood you correctly but I presume you were trying to calculate spherical harmonics of large degree and/or order. Unfortunately this function was not designed with such applications in mind, but I updated it and it should now be able to handle those numbers. Naturally, this will only work in the normalized mode, as unnormalized spherical harmonics overflow the double-precision range for n > 150. Please do let me know if this helps!

Hi Javier

Thank you for your work. For EGM2008 Nmax = 2196 does not receive factorial expressions I have the same problem in the code I wrote what can we do in it valid?

Updates

2.0.1

See release notes for this release on GitHub: https://github.com/jmontalt/harmonicY/releases/tag/v2.0.1

2.0.0

See release notes for this release on GitHub: https://github.com/jmontalt/harmonicY/releases/tag/v2.0.0

1.1

- Fix to enable the calculation of large degree and order spherical harmonics.

1.0.3

- Definitely fixed file upload.

1.0.2

- Hopefully fixed file upload.

1.0.1

- Small changes to documentation.

MATLAB Release Compatibility
Created with R2018a
Compatible with any release
Platform Compatibility
Windows macOS Linux