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Length of actual parameters in a function call.
Hi, A few weeks ago, reviewing some tutorials on pattern matching and error handling, I came across an undocumented function to monitor the number of parameters submitted to a function in a call; but somehow I lost its track later. I guess that it must be something well-known by our specialists. Any help about where to locate it? The undocumented feature helps in tracking situations as when we define "MyFunction[a_,b_,c_]:= something" and then it is called as "myFunction[a]" leaving the function unevaluated. E. martin-Serrano