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mathematica newbie trouble
- To: mathgroup at smc.vnet.net
- Subject: [mg99276] mathematica newbie trouble
- From: Guapo <yangshuai at gmail.com>
- Date: Fri, 1 May 2009 05:52:31 -0400 (EDT)
i wrote the following mathematica code:
s := (a + b + c)/2;
k[a_, b_, c_] := Sqrt[s (s - a) (s - b) (s - c)];
k[3, 4, 5]
k[5, 9, 12]
when run it, i can't get the write answer. but i change setDelayed(:=)
to set(=), everything works ok
s = (a + b + c)/2;
k[a_, b_, c_] = Sqrt[s (s - a) (s - b) (s - c)];
k[3, 4, 5]
k[5, 9, 12]
i did a google search for the difference of set and setDelayed,
however, i still can't understand it for the upper described problem,
could anyone explain it? great thanks.
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