why DEtools:-DEplot gives different plot when using Pi vs. round(Pi) in trange?

Question:why DEtools:-DEplot gives different plot when using Pi vs. round(Pi) in trange?

Posted: nm 11978 Product: Maple 2025

9 hours ago

Is the following behavior expected? using t=0 .. 3*Pi vs. t=0 .. round(3*Pi) give different plots. Why? Should not the plot be the same?

ps. do not know if I asked this before or not. I can't remember. Search in Mapleprimes is not easy.

>	interface(version);

restart;

>	ode := diff(y(t), t$2) + y(t)=0; DEtools:-DEplot(ode, y(t), t=0 .. 3*Pi, y=-1 .. 1,[[y(0)=1,D(y)(0)=0]],linecolor=blue);

diff(diff(y(t), t), t)+y(t) = 0

>	DEtools:-DEplot(ode, y(t), t=0 .. round(3*Pi), y=-1 .. 1,[[y(0)=1,D(y)(0)=0]],linecolor=blue);

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