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Libsharp / libsharp

Library for fast spherical harmonic transforms, see http://arxiv.org/abs/1303.4945
GNU General Public License v2.0
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Equivalent of rotate_alm #21

Open zonca opened 5 years ago

zonca commented 5 years ago

I'd like to do a distributed coordinate system transformation in alm space with libsharp, the equivalent of the HEALPix rotate_alm functionality, is there a way to do it? If it is not exposed to Python, I can help with that

mreineck commented 5 years ago

I'm sorry, I've still not got around to implementing this. It's definitely on my todo list, but implementing this properly is much harder than I anticipated, and I'm fairly overcommitted at the moment :(

hke commented 5 years ago

Hi!

⁣Just wanted to register my interest in this operation as well -- it could provide a much more efficient preconditioner for the Commander CG search for satellite missions, by rotating into the map making equation into Ecliptic coordinates, and define a block diagonal covariance matrix in m-modes. So when and if this does happen, I'd be very interested in serving as a test dummy if that's useful :-)

Thanks!

Hans Kristian

  1. jun. 2019, 12:38 kl. 12:38 skrev mreineck notifications@github.com:

    I'm sorry, I've still not got around to implementing this. It's definitely on my todo list, but implementing this properly is much harder than I anticipated, and I'm fairly overcommitted at the moment :(

    -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/Libsharp/libsharp/issues/21#issuecomment-497933414