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 >