Re: rules->function:THANKS+new plotting question
- To: mathgroup at smc.vnet.net
- Subject: [mg7393] Re: rules->function:THANKS+new plotting question
- From: Lord of Darkness <j.biddiscombe at rl.ac.uk>
- Date: Fri, 30 May 1997 01:19:55 -0400 (EDT)
- Organization: Rutherford Appleton Laboratory
- Sender: owner-wri-mathgroup at wolfram.com
Thanks to all the people who replied to my rules->function question
it turns out the problem was being caused by...
soln=Solve[equation,z]
gave
out[...]: {{z->blah blah...}}
and it was the presence of the curly brackets that was the problem.
If I put
f[x_,y_] := Replace[Flatten[soln][[n]]]]
(n = solution number for multiple solutions) then the problem goes away.
---------------------------
Here's a new question
If I wish to plot a function say
f[x,y] {x,xmin,xmax},{y,ymin,ymax}
then the range of values is effectively a rectangular region in (x,y)
But..
Suppose values of y do not exist for all values of x, and I wish to plot
ParametricPlot[f[x,y],{x,xmin,xmax},{y,ymin[x],ymax[x]}]
so the values of y are dependent on x - ie my solution space is no
longer a regtangular region, but some arbitrary shape depending on
ymin[] and ymax[]
How do I do that ?
Help gratefully appreciated..
John B