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Question: solution of differential equations

Question:solution of differential equations

porya 12
plot student
April 26 2010
0
I think, it's a simple trouble, but I can't solute it. Help me, please restart; > PDE:=diff(T(x,t),t)=5.71*10^(-6)*diff(T(x,t),x,x); > BC:={T(0,t)=500*(1-t/1200)^10+1000,T(x,0)=1500}; > SOL:=pdsolve(PDE,BC,numeric,timestep=50, spacestep=1/200); > SOL:-plot3d(x=0..0.25,t=0..1200); Error, (in pdsolve/numeric/par_hyp) must specify time variable using 'time=varname' Error, `SOL` does not evaluate to a module
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