# differential equation-drawing isocline and flow vector

Printable View

• May 19th 2008, 03:56 PM
szpengchao
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?