compose a name in function

I write a function to plot some graphs and a gave for it one result of
lm() (reg) and a character (name). In  win.metafile("name-%02d.wmf",
pointsize = 14) i want compose de name of file with the string i pass to
the function. How i can make this?

plota.res.grava <- function(reg,name){

    win.metafile("name-%02d.wmf", pointsize = 14)
...
}

Thanks
R. Bertola
-- 
  
  bertola at fastmail.fm

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