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q's about NumericQ and saving interpolating function

• To: mathgroup at smc.vnet.net
• Subject: [mg46930] q's about NumericQ and saving interpolating function
• From: sean_incali at yahoo.com (sean kim)
• Date: Tue, 16 Mar 2004 02:37:40 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Hi steve, I think this message got lost. so here's another copy. 


hello group,

i'm having problem understanding NumericQ. 

eq[a_?NumericQ] := y''[x] + a^2*y[x] == 0 

sol[a_?NumericQ] := NDSolve[{eq[a], y[0] == 1, y'[0] == -1}, y, {x, 0,
10}]

s1 = sol[4] 
Plot[y[x] /. s1, {x, 0., 10.}]


question is, let's say some choices of "a" makes the equation
non-numeric(ie, make the NDsolve fail), will the above expression
evaluate?


another and unrelated question is ...

how do I export the interpolating function resulting from NDSolve
routine? i remember seeing similar post in the group, but now I can't
find it... the idea is to save the interpolating function as uniquely
named files such that they can be recalled from the front end.

thanks in advance again

sean

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