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Question: problem with phaseportrait use of DEtools.

Question:problem with phaseportrait use of DEtools.

Euclid 698 Maple
October 18 2009
0

question1:

DEtools[phaseportrait]

([diff(y(x),x)=-y(x)],y(x),x=-2.2,[[y(-2)=2],[y(-2)=1],[y(-2)=-2]],dirgrid=[17,17],arrows=LINE,axes=NORMAL);

This is the version in Maple 7?

After accessing to the help file,maybe it should be

with(DEtools):

phaseportrait(diff(y(x),x)=-y(x),y(x),x=-2.2,[[y(-2)=2],[y(-2)=1,[y(-2)=-2]],dirgrid=[17,17],arrows=LINE,axes=NORMAL);

but can't generate the resuls.

dirgrid seems not exist in the help.

 

question2:

If I'm in 2D-Math mode,how to enter the" _" directly? It will automatically convert to the mode input the subscript when input a varible name or other.

 
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