Grad-only spin SHTs

[mreineck]

I compared the ALM2MAP_DERIV SHT mode to the spin-SHTs, and as far as I can tell, it is identical to a spin-1 SHT where the curl component is zero, with one difference: the input a_lm are multiplied with an additional factor sqrt(l*(l+1)).

Does that agree with your observations, @carronj ?

If that is indeed the case (and if the transform works in an analogous fashion for higher spins), introducing grad-only alm2map and adjoint_alm2map should not be a big deal. In this mode I'd like to omit the sqrt(l*(l+1)) factor however,and the user should apply it if needed.

[carronj]

All this makes perfect sense to me.

…

Le 15 mars 2023 à 09:20, mreineck ***@***.***> a écrit : I compared the ALM2MAP_DERIV SHT mode to the spin-SHTs, and as far as I can tell, it is identical to a spin-1 SHT where the curl component is zero, with one difference: the input a_lm are multiplied with an additional factor sqrt(l*(l+1)). Does that agree with your observations, @carronj <https://github.com/carronj> ? If that is indeed the case (and if the transform works in an analogous fashion for higher spins), introducing grad-only alm2map and adjoint_alm2map should not be a big deal. In this mode I'd like to omit the sqrt(l*(l+1)) factor however,and the user should apply it if needed. — Reply to this email directly, view it on GitHub <#11>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACW2IOLJVX5XY52V22BPAJTW4F3UXANCNFSM6AAAAAAV3OVQ5A>. You are receiving this because you were mentioned.

[mreineck]

Implemented in 0.30