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Array elements inside proc Posted by Arshad (Arshad), 3 January 2008 I am able to add an element to the array using the reference addr but I cannot print it or copy it to any other variable. This seems to be a bit surprising !!proc foo {in} { upvar in addr puts $addr(3) } for {set count 1} {$count <= 4} {incr count} { set sa($count) $count } foo sa; Error- can't read "addr(3)": no such variable parray sa; Posted by admin (Graham Ellis), 3 January 2008 In Tcl, you must use a dollar sign if you want to refer to the contents of a variable, but you do not use a dollar sign if you are setting the value, or doing both at in the same context.So you probably meant upvar $in addr and not upvar in addr since in the the name of the array that is passed in to the proc and is only used (and not set) within the upvar command, even if the array who's name it refers to may be set. When I'm running a Tcl course, I always find myself spending longer on upvar than any other command. And judging by the number of questions on it that I get here from people I have not trained, I think it's one of those things a lot of people need help with! This page is a thread posted to the opentalk forum
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