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MathGroup Archive 2005

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Re: How to Clear y'[0]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57251] Re: [mg57233] How to Clear y'[0]
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sun, 22 May 2005 00:14:16 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

Clear[y];  will clear y[0]

y[0]=1;

Clear[y];

Simplify[DSolve[{y''[t]==y[t],y[0]==1},y[t],t]]

{{y[t] -> C[2]/E^t - E^t*(C[2] - 1)}}


Bob Hanlon

> 
> From: "Joseph Fagan" <noemailplease at nowhere.ru>
To: mathgroup at smc.vnet.net
> Date: 2005/05/21 Sat AM 02:40:21 EDT
> Subject: [mg57251] [mg57233] How to Clear y'[0]
> 
> 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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