Re: Cannot plot this functions
- To: mathgroup at smc.vnet.net
- Subject: [mg53863] Re: Cannot plot this functions
- From: D Herring <dherring at at.uiuc.dot.edu>
- Date: Tue, 1 Feb 2005 04:08:13 -0500 (EST)
- References: <ctfv5b$pe2$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
> I need to plot the negative derivative of this function with respect
> to Ï?. Whne I use plot it gives me the error:
>
> function is not a machine - size real number at Ï? =1.8622242690864824`*^-7
Sometimes, simply wrapping your expression in an Evaluate[] will
eliminate this error.
I've had several troublesome cases where
Plot[EXPRESSION, {t,0,10}]
gave "function is not a ... at t=4..."
while
Plot[Evaluate[EXPRESSION], {t,0,10}]
works just fine.
They hint about this in the documentation, but its still easy to miss.
Hope that helps,
Daniel