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Question: blank procedure call

Question:blank procedure call

Christopher2222 5785 Maple
proc
August 09 2010
0

I'm trying to get a blank procedure call to work.  How can I go about doing that?

I wanted to do something like this

changedir:=proc(change)
  if change=NULL then currentdir("f:/") else currentdir(change) end if:
end proc:

changedir()
Error, invalid input: changedir uses a 1st argument, change, which is missing
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