I have been wrapping my head about a question it may look simple to you. I want compile a function that depends on a number of undetermined variables as,

Compile[{{x, _Real}, {y, _Real}, {z, _Real}, {w,_Real},...}, Evaluate[f(x,y,z,w,..,)], 
 RuntimeAttributes -> {Listable}, RuntimeOptions -> "Speed", 
 Parallelization -> True]

Where {x,y,z,...} can be as long as needed. I have tried the simple exercise of doing,

list=Table[{var[[i]], _Re},{i,Length@var}];
Compile[list, Evaluate[f(x,y,z,w,..,)], RuntimeAttributes -> {Listable}, RuntimeOptions -> "Speed", Parallelization -> True]

but it does not seem to work since _Re needs to be symbolic? (I am asking but I do not know).

Thanks for your comprehension!


I found a solution thanks to: Evaluating arguments of module (inside compile)

This is what it worked for me:

Compile[Evaluate@({#, _Real} & /@ var), Evaluate[f(x,y,z,w,..,)], RuntimeAttributes -> {Listable}, RuntimeOptions -> "Speed", Parallelization -> True]
  • 3
    $\begingroup$ Why not just have your compiled function accept a list of reals? $\endgroup$
    – J. M.'s torpor
    May 11 '20 at 10:17
  • $\begingroup$ Hi J.M. thanks for replying. I am not sure I understand what you mean. Are you asking to pass to compile a list of reals instead of a function? If this is the case, this does not work for me since the list is huge and I have to pass it many times. $\endgroup$
    – Xisco
    May 11 '20 at 15:13

I think this is what @JM was suggesting:

cfun = Compile[{{list, _Real, 1}}, Sin[list]];

In other words, define your function to take a rank-1 tensor (i.e. a list) of reals; you do not need to specify the length beforehand! Then, just evaluate whatever you need on that list. For instance, here are two examples with lists of different lenghts:

(* {0.841471, 0.909297, 0.14112, -0.756802, ..., 0.992973, 0.636087, -0.305614}*)

(* {0.841471, 0.909297, 0.14112} *)
  • 1
    $\begingroup$ Once again, thanks for following through! $\endgroup$
    – J. M.'s torpor
    May 12 '20 at 2:39

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