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Question: Positioning of the various terms in pdsolve

Question:Positioning of the various terms in pdsolve

J4James 355 Maple 16
numeric pdsolve
June 30 2013
0

I consider a PDE system (?pdsolve,numeric)

PDE := {diff(u(x,t),t)=-1/20*diff(v(x,t),x,x),
diff(v(x,t),t)=diff(u(x,t),x,x)}:

IBC := {u(x,0)=sin(Pi*x), u(0,t)=0, u(1,t)=0,
v(x,0)=1-x, v(0,t)=1, v(1,t)=0}:

pds := pdsolve(PDE, IBC, numeric, spacestep=1/50);

Suppose, I need to use the data diff(u(x,t),x,x)  or diff(v(x,t),x,x) at x=0.

How can I call it from pds? or How can I get it?

or how we can plot diff(v(x,t),x,x) at x=0 vs t?

Thanks
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