CODEWITHSUNDEEP
scilab
W.314
W.314

Reputation: 156

How to know the number of arguments of a Scilab function

Is it possible to determine the number of arguments of a function in Scilab ?

let's say I have a function as follows : 

function T = test(t,x)
    T = t*x
endfunction

In this case I should get 2 as output. To be more specific, my goal here is to know the number of arguments but uniquely using the function's name.

 function N = NumberArgument(F)
    // F is a function
    N = ....
 endfunction

And so I want to have 

 a = NumberArgument(test)
 a = 2

Thank you for your answer

Upvotes: 2

Views: 247

Answers (2)

spoorcc
spoorcc

Reputation: 2955

Yes, using argn you can determine the number of input & output arguments

function T = test(t,x)
    [lhs,rhs]=argn(0);
    disp(rhs);
    T = t*x;
endfunction

Using macrovar you can determine the number of arguments from outside the function

function N = NumberArgument(F)
    // F is a function
    all_vars = macrovar(F);
    in_vars = all_vars(1);
    N = size(in_vars, 1);
endfunction

disp(NumberArgument(test))

Upvotes: 1

Orace
Orace

Reputation: 8359

Short:

I think it's not possible.

Long:

You want to get the type signature of a function.

After a little bit of research I find out that user defined functions and some built-in function (the ones coded in scilab) have the same type:

-->deff('[r] = test(a, b)', 'r=a*b');
-->type(test)
 ans  =
     13.  
-->type(plot)
 ans  =
     13.

I think you can't have more information about a function than is type.

Now, let say you want the signature of plot.

And as you can see here there are multiple signature (note that plot() without arguments is not documented).

Almost all scilab function use argn and the signature possibility with this is illimited...

Upvotes: 0

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