sprintf, check number of parameters

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

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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