Hi Duncan,Thanks!
But I still get a little confused about outer() func. Would give me a simple
example to contour it? Just like the formula x^2 + y^2 + x + y -5 = 0.
(Sorry I am a newbie to R, found really hard to use the R manual)
Thanks,
Hao
On Sat, Jul 4, 2009 at 7:10 AM, Duncan Murdoch <murd...@stats.uwo.ca> wrote:
> Hao Jiang wrote:
>
>> Hi,
>> I want to plot a polynomial in the form like ax^2 + bxy + cy^2 + dx + ey +
>> f
>> =0 without solving it(since I may have 3 or 4 dimensional polynomial and
>> it's really hard to solve). Is there any way to plot this kind of
>> polynomial?
>>
>> Thanks a lot!
>>
> There are lots of ways. A contour plot is probably most informative, a
> persp plot is prettier. In either case you need to evaluate the polynomial
> on a grid, and pass the matrix of values to the plotting function.
>
> The outer() function is handy for doing the grid evaluation.
>
> Duncan Murdoch
>
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