R help - Jan 2009 - Customized LDA (MASS) object plot

Hi R experts.

I performed an Linear Discriminant Analysis (lda) and now I want to plot the
first two axes (LDA1 and LDA2). Well MASS package have the plot.lda and
pairs.lda to do that. But, they don’t let me personalize them, once they
don’t accept the type=’n’ plot. So I start looking at the lda object
properties, trying to found out my groups (n=4) axis coordinates, curiously
I couldn’t. There is only the variables axis coordinates and some analysis
results. If I can reach this information, I’ll be able to create a
customized graph using the normal plot(), points() and par().

So the question is: How could I reach these axis coordinates inside my
object (supposing they are there somewhere, once the plot.lda and pairs.lda
are able to plot them)?

 

Thanks in advance.

___________________________________
MSc.  <mailto:r.aluizio@gmail.com> Rodrigo Aluizio
Centro de Estudos do Mar/UFPR
Laboratório de Micropaleontologia
Avenida Beira Mar s/n - CEP 83255-000
Pontal do Paraná - PR - BRASIL
Fone: (0**41) 3455-1496 ramal 217
Fax: (0**41) 3455-1105




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Hmm: what do you want to do that a customized panel function cannot do?

plot.lda does not accept type="n" precisely because it does support a 
panel function to plot within the axes it has set up.  Your claim that 
'they don?t let me personalize them' is simply untrue.

If you want to see the source code, just type 'MASS:::plot.lda'.

Futhermore, MASS is support software for a book, and the book does have 
examples of customized LDA plots!


On Sun, 4 Jan 2009, Rodrigo Aluizio wrote:
> Hi R experts.
>
> I performed an Linear Discriminant Analysis (lda) and now I want to plot
the
> first two axes (LDA1 and LDA2). Well MASS package have the plot.lda and
> pairs.lda to do that. But, they don?t let me personalize them, once they
> don?t accept the type=?n? plot. So I start looking at the lda object
> properties, trying to found out my groups (n=4) axis coordinates, curiously
> I couldn?t. There is only the variables axis coordinates and some analysis
> results. If I can reach this information, I?ll be able to create a
> customized graph using the normal plot(), points() and par().
>
> So the question is: How could I reach these axis coordinates inside my
> object (supposing they are there somewhere, once the plot.lda and pairs.lda
> are able to plot them)?
>
>
>
> Thanks in advance.
>
> ___________________________________
> MSc.  <mailto:r.aluizio at gmail.com> Rodrigo Aluizio
> Centro de Estudos do Mar/UFPR
> Laborat?rio de Micropaleontologia
> Avenida Beira Mar s/n - CEP 83255-000
> Pontal do Paran? - PR - BRASIL
> Fone: (0**41) 3455-1496 ramal 217
> Fax: (0**41) 3455-1105
>
>
>
>
> 	[[alternative HTML version deleted]]
>
>
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595