Re: Question about how to graph the vector field for the differential
- To: mathgroup at smc.vnet.net
- Subject: [mg97960] Re: Question about how to graph the vector field for the differential
- From: dh <dh at metrohm.com>
- Date: Thu, 26 Mar 2009 05:25:02 -0500 (EST)
- References: <gq7j9f$qeo$1@smc.vnet.net>
Hi,
the direction field is plotted by:
dir[x_, y_] := Normalize[{1, 2 x - y}]
VectorPlot[dir[x, y], {x, -3, 3}, {y, -3, 3}]
The velocity field:
vel[x_, y_] := {1, 2 x - y}
VectorPlot[vel[x, y], {x, -3, 3}, {y, -3, 3}]
The stream field:
vel[x_, y_] := {1, 2 x - y}
StreamPlot[vel[x, y], {x, -3, 3}, {y, -3, 3}]
hope this helps, Daniel
jo1e984 at gmail.com wrote:
> i need to graph the vector field and the family of solutions for the
> DE: dy/dx=2x-y
> and i tried the graph the vector field, but while i tried to use the
> VectorFieldPlot it show up some kind of wierd graph...
> and i cannot even get start on the "family of Solutions"
> graph...searched online but still cannot figure out.
> hope some pros can help me out on this...thx alot~!!
> Bluefly
>