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Unevaluated functions

• To: mathgroup at smc.vnet.net
• Subject: [mg109337] Unevaluated functions
• From: mokambo <alexandrepassosalmeida at gmail.com>
• Date: Thu, 22 Apr 2010 03:31:50 -0400 (EDT)

Hello,

In Mathematica when a function returns unevaluated the "return value"
is the name of the function with arguments.
How do we control such output? Can we suppress it? How do we change
the usual string for something like "N/A"?
Advise please.

Alex