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Question: Problem in plotting

Question:Problem in plotting

Al86 145 Maple
plot pde
October 13 2015
0

I have the solution to a heat PDE, v and the error esitmate u + cos(x+t) = v

 

I want to plot log v(1,t) as function of log u(1,t) in maple, but I seem to get an error:

Error, (in plot) unexpected option: ln(u(1, t))

 

I am attaching my code below.

How to fix this problem?

Thanks in advance.

PDE+cos.mw
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