[Rd] sprintf, check number of parameters

[Tomas Kalibera]

Dear Matthias,

thanks for the suggestion, R-devel now warns on unused arguments by 
format (both numbered and un-numbered). It seems that the new warning is 
useful, often it finds cases when arguments were accidentally passed to 
sprintf but had been meant for a different function.

R allows combining both numbered and un-numbered references in a single 
format, even though it may be better to avoid and POSIX does not allow 
that.

Best
Tomas

On 9/20/20 1:03 PM, Matthias Gondan wrote:
> Dear R developers,
>
> I am wondering if this should raise an error or a warning.
>
>> sprintf('%.f, %.f', 1, 2, 3)
> [1] "1, 2"
>
> I am aware that R has „numbered“ sprintf arguments (sprintf('%1$.f', …), and in that case, omissing of specific arguments may be intended. But in the usual syntax, omission of an argument is probably a mistake.
>
> Thank you for your consideration.
>
> Best wishes,
>
> Matthias
>
>
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