R help - Aug 2014 - problem when I Call C subfunction in void function

Hi everybody,
I am including some C code in R program using the .C interface.
I would like use a C subfunction calling by C void function.

/double essai (double Px[], int tailleP)
{
	Rprintf ("I print Px %d\t", Px[1]);
	return 57;
}

void test_essai (double *Px, int *tailleP, double *res)
{
	*res = essai(*Px, *tailleP);
}/

This program doesn?t work. When I compile it, I have the following error : 
?In function ?test_essai :
-	Error: incompatible type for argument 1 of ?essai?
-	Note : expected ?double*? but argument is of type ?double? ?

Does anyone have solution ? 
Thank all, Elie 




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On Wed, Aug 27, 2014 at 4:58 AM, eguichard <elie.guichard at inserm.fr>
wrote:
> Hi everybody,
> I am including some C code in R program using the .C interface.
> I would like use a C subfunction calling by C void function.
>
> /double essai (double Px[], int tailleP)
> {
>         Rprintf ("I print Px %d\t", Px[1]);
>         return 57;
> }
>
> void test_essai (double *Px, int *tailleP, double *res)
> {
>         *res = essai(*Px, *tailleP);
This line is wrong. Try:
           *res = essi(Px, *tailleP);

Note that double *Px and double Px[] are basically different ways to
say pretty much the same thing. At least in C. Not in C++ or many
other languages. But further discussion would be even more off topic.
> }/
>
> This program doesn?t work. When I compile it, I have the following error :
> ?In function ?test_essai :
> -       Error: incompatible type for argument 1 of ?essai?
> -       Note : expected ?double*? but argument is of type ?double? ?
>
> Does anyone have solution ?
> Thank all, Elie
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