differential equation-drawing isocline and flow vector

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May 19th 2008, 03:56 PM
szpengchao

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differential equation-drawing isocline and flow vector

http://www.mathhelpforum.com/math-he...1&d=1211241379

i have problem with drawing isoclines and flow vectors
May 19th 2008, 04:01 PM
Mathstud28

Quote:

Originally Posted by szpengchao

http://www.mathhelpforum.com/math-he...1&d=1211241379

i have problem with drawing isoclines and flow vectors

Letting $\frac{dy}{dx}=c$

we see that $c=\frac{x-2y}{2x+y}\Rightarrow{y=\frac{5x}{c+2}-2x}$

Now letting c be equal to certain numbers sketch your isoclines

and considering c is a constant your isoclines are lines
May 19th 2008, 04:05 PM
szpengchao

yeah

yeah...i got that...but i saw others' work, there are not only straight lines but some vector...

how can u draw the flow vector diagram for this?

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