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ReplacePart?

• To: mathgroup@smc.vnet.net
• Subject: [mg10480] ReplacePart?
• From: "Scott Morrison" <scott@morrison.fl.net.au>
• Date: Fri, 16 Jan 1998 04:35:03 -0500
• Organization: The University of Sydney, NSW, Australia

I have a list of pairs of the form:
gt={{3,5},{{},6},{7,{}},{{},{}},{{},56},{{},3}};

The empty lists inside pairs are being used as placeholders. I want to
replace these with the elements of b: b={a1,a2,a3,a4,a5,a6};
hopefully resulting in the list
{{3,5},{a1,6},{7,a2},{a3,a4},{a5,56},{a6,3}}

I had thought that ReplacePart could do this, as it says:
"ReplacePart[expr, new, pos, npos] replaces parts at positions pos in
expr by
  parts at positions npos in new."


I can't get this to work at all. If someone could explain how to do this
sort of thing, using ReplacePart or otherwise, I would be most
grateful.

Scott Morrison
scott@morrison.fl.net.au