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Question: How do I plot the numerical solution of complex PDE by using pdsolve?

Question:How do I plot the numerical solution of complex PDE by using pdsolve?

Ali_Abdul 5 Maple
complex pde numeric pdsolve differential-equations plotting
May 23 2020
1

 Dear Maple community, 
I am struggling with the numerical solution of the complex (linear) partial differential equation to obtain results. For example, I see such as this statement "Error, (in pdsolve/numeric/plot) unable to compute solution for t<HFloat(0.0): signum is not differentiable at complex values" pops up. I did my homework but I didn't get anything. I will be happy if someone could give me some suggestions or advice. Thank you in advance. 
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