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>
• 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.
>
>

```

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