Can I combine more than 2 pairs of sources?

[kabrantes]

Hi Andrew,

I was wondering if it is possible to (a-posteriori) combine more than 1 pair of sources in simmr, e.g. to combine 2 sources into 1, and two other sources into another one? If so, how can i go about it? Cheers!!

[andrewcparnell]

Hi Kabrantes,

Yes this is perfectly possible. You just need to run the combine_sources command as many times as the sources you want to combine. If you look at the vignette and run the commands up to:

simmr_out_combine = combine_sources(simmr_out,
                                     to_combine=c('U.lactuca','Enteromorpha'),
                                     new_source_name='U.lac+Ent')

You can just keep combining, e.g.:

simmr_out_combine_2 = combine_sources(simmr_out_combine,
                                    to_combine=c('Zostera','U.lac+Ent'),
                                    new_source_name='Zos+U.lac+Ent')

Hope that helps,

Andrew

[kabrantes]

Thanks for the quick answer!! But I meant two separate pairs. Like seagrass+epiphytes (high d13C), and also mangrove and saltmarsh succulents (low d13C). Cheers!

[andrewcparnell]

You can combine any sources you like in any combination you like, but at each step of calling combine_sources you can only combine two sources at a time. If you want a model with sources, e.g. A+B vs C+D you just need run it once to combine A+B and then again to combine C+D. Or am I misunderstanding what you're trying to do?

[kabrantes]

Oh yes! Got it! Sorry, I should have got it from your first answer, makes perfect sense, thanks!! :)