Method that returns the frequency at a specific index on a Spectrogram

[Hermanlrx]

Describe the feature

Having a method that converts between indices and frequencies for GenericSpectrogram could be really useful for ML or other post-processing operations.

Proposed solution

I am not sure if it will work for all providers, but if .freq_axis() is available, the information should already be there. Something like .freq_at_index(idx)

[Monier-Ayman]

Hi,

I’m Monier, a computer science student preparing for GSoC 2026.
I’m interested in working on issue #129 by implementing a freq_at_index() method that returns the frequency at a given index.

[samaloney]

@Monier-Ayman great to hear you are interesting in GSOC, SunPy and radiospectra. I'm not sure this is the best issue to begin with as the implementation will change depending on the outcome of the early tasks in the GSOC project.

[Monier-Ayman]

@samaloney Thanks for the clarification!
I understand. Please let me know if there’s something better to start with — I’d be happy to work on it.

[samaloney]

Will depend on the final data structure used for the Spectrogram, Spectrum object so not sutabale for work until after this has been decided.