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Question: Problem with phase portrait

Question:Problem with phase portrait

123aze 10 Maple 17
April 17 2014
2

Hi everybody,

i don't understand when i use these examples from the help:

 

DE1 := {diff(z(x), x) = y(x)*x, diff(y(x), x, x) = y(x)*z(x)};
DEplot3d(DE1, [y(x), z(x)], x = -2 .. 2, [[y(0) = 1, (D(y))(0) = 2, z(0) = 1]], y = -4 .. 4, obsrange = true, stepsize = 0.5e-1, iterations = 3, orientation = [-124, 72]);

 

and when i look on my screen i have a white cube without phase portrait so i don't understand...

 

Thanks! and sorry for my english i'm french...
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