[R] plot for linear discriminant

[Hadley Wickham]

Hi Giovanni,

Have a look at the classifly package for an alternative approach that
works for all classification algorithms.  If you provided a small
reproducible example, I could step through it for you.

Hadley

On Sat, May 15, 2010 at 6:19 AM, Giovanni Azua <bravegag at gmail.com> wrote:
> Hello,
>
> I have a labelled dataset with three classes. I have computed manually the LDA hyperplane that separate the classes from each other i.e.
>
> \hat{\delta}_j(x)=x^Tb_j + c_j where b_j \in \mathbb{R}^p and c_j \in \mathbb{R}
>
> my concrete b_j looks like e.g.
> b_j <- rbind(1,2)
> c_j <- 3
>
> How can I plot y=x^Tb_j + c_j ??  two problems:
>
> 1- I need lines and the dimension of my x is 2
> 2- I would like the plotted lines to end when they intersect so they nicely show the decision boundaries
>
> Any pointers? maybe an example with ggplot2 I could not find any from the showcase documentation page ...
>
> Thanks in advance,
> Best regards,
> Giovanni
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-- 
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/