Re: How to Clear y'[0]
- To: mathgroup at smc.vnet.net
- Subject: [mg57255] Re: How to Clear y'[0]
- From: Jean-Marc Gulliet <jeanmarc.gulliet at 9online.fr>
- Date: Sun, 22 May 2005 00:14:21 -0400 (EDT)
- Organization: New York University
- References: <d6mmis$ggo$1@smc.vnet.net>
- Reply-to: jmg336 at nyu.edu
- Sender: owner-wri-mathgroup at wolfram.com
Hi Joseph,
Enter "y[0]=." to clear the definition of y[0].
In[42]:=
y[0]=.
In[44]:=
DSolve[{y''[t]\[Equal]y[t],y[0]==1},y,t]
Out[44]//InputForm=
{{y -> Function[{t},
-((-E^(2*t) - C[2] + E^(2*t)*C[2])/E^t)]}}
Best regards,
/J.M.
Joseph Fagan wrote:
> Newbie.
> Acidently input
> DSolve[{y''[t] == y[t], y[0] = 1}, y, t]
>
> and end up setting y[0] to 1, instead of
>
> DSolve[{y''[t] == y[t], y[0] == 1}, y, t]
>
> However
>
> Clear[ y , y[0] , "y*" ]
>
> fails to Clear y[0] (not a symbol or a string) and I need to exit the
> program and start again.
>
>