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Re: How do declare real functions? (was: NDSolve Problems)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg67972] Re: How do declare real functions? (was: NDSolve Problems)
  • From: "James Gilmore" <james.gilmore at yale.edu>
  • Date: Wed, 19 Jul 2006 05:21:12 -0400 (EDT)
  • References: <e9frkc$2m4$1@smc.vnet.net><e9ibi3$4v4$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

Perhaps
http://support.wolfram.com/mathematica/kernel/Symbols/System/NDSolve.html
will be of some use?

One can wrap the function in Re[] to force the function to be real,
e.g.

In[4]:=
f[x_] = Sqrt[x];
freal[(x_)?NumericQ] := Re[f[x]]
freal[-1]
Out[6]=
0

but Im not sure of the context that you want a strictly real function.

Cheers
James Gilmore


wandering.the.cosmos at gmail.com wrote:
> I have a related question: is it possible in Mathematica to declare my
> function to be strictly real?


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