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. > >