found the solution:
v <- function(x, ...) UseMethod("v")
setMethod('v', signature(x='character'), function(x, ...) v.print(x, ...))
setMethod('v', signature(x='numeric'), function(x, ...) v.numeric(x, ...))
v.print <- function(x,y=x,z=x) print(paste(x,y,z))
v.numeric <- function(x,u=3*x) print(u*x)
examples:
v(1)
v('a')
The tab-key after typing 'v( gives:
x=
...
u=
y=
z=
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