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Find the number of arguments for an RFunction? #503

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ChrisRackauckas opened this issue Oct 7, 2023 · 1 comment
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Find the number of arguments for an RFunction? #503

ChrisRackauckas opened this issue Oct 7, 2023 · 1 comment

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@ChrisRackauckas
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If I have an RFunction from R, is there a way to know how many arguments it expects?
ChrisRackauckas added a commit to SciML/SciMLBase.jl that referenced this issue Oct 7, 2023
@ChrisRackauckas
Rename the extension packages and do RCall as well
e69a1ac 
Fixes the name of the extensions so they don't clash elsewhere. Also adds an RCall one which is basic and assumes out of place, which is a fine assumption given that R is copy-on-write and thus mutation of the form of an in-place function is just not possible. This means that we don't get the great error messages, but oh well we can figure that out later.

Fixes SciML/diffeqr#41

Better version requires JuliaInterop/RCall.jl#503
@ChrisRackauckas ChrisRackauckas mentioned this issue Oct 7, 2023
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@simonbyrne
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You can use formals:

julia> f = R"function(a,b=2) a+b"
RObject{ClosSxp}
function (a, b = 2)
a + b


julia> R"formals"(f)
RObject{ListSxp}
$a


$b
[1] 2


julia> length(R"formals"(f))
2

@palday palday closed this as completed Nov 14, 2023
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@palday @simonbyrne @ChrisRackauckas