R help - Oct 2003 - lda source code

I am new to R. Trying to find out how lda() {in MASS R1.8.0 Windows} was
implemented in R. Does anyone know where to find out lda source code ?
Thanks.

Wei

Wei Geng wrote:
> I am new to R. Trying to find out how lda() {in MASS R1.8.0 Windows} was
> implemented in R. Does anyone know where to find out lda source code ?
> Thanks.
Here:

http://cran.r-project.org

Hint: MASS is a *package*.  You want to view its *source*.

Same with most other R packages.  Or just about anything else you want 
to know about R.

Cheers

Jason
-- 
Indigo Industrial Controls Ltd.
http://www.indigoindustrial.co.nz
64-21-343-545
jasont at indigoindustrial.co.nz

Consider the following: 

 > library(MASS)
 > lda
function (x, ...)
UseMethod("lda")
<environment: namespace:MASS>
 > methods(lda)
[1] "lda.data.frame" "lda.default"   
"lda.formula"    "lda.matrix"

Now type "lda.data.frame" or "lda.default", etc., at a
command prompt to
see the corresponding R code. 

Is this what you want?
spencer graves

Wei Geng wrote:
>I am new to R. Trying to find out how lda() {in MASS R1.8.0 Windows} was
>implemented in R. Does anyone know where to find out lda source code ?
>Thanks.
>
>Wei
>
>______________________________________________
>R-help at stat.math.ethz.ch mailing list
>https://www.stat.math.ethz.ch/mailman/listinfo/r-help
>  
>

Wei Geng wrote:
> Does anyone know where to find out lda source code ?
Try typing lda.default at the prompt. That should get you started. Also see:

 > methods(lda)

as lda.default isn't the only bit of code used in lda()

Alternatively, grab the source from CRAN and read it at your leisure.

HTH

Gav

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Gavin Simpson                     [T] +44 (0)20 7679 5522
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Wei Geng,

I asked the same question about six weeks ago, so let me try to answer it. 
The source for the entire package 'MASS' is in a single file, I believe
(at
least this is true on my Linux setup). The exact location of that file 
you'll have to determine by searching the directory/folder where you 
installed it. The function 'lda' is implemented entirely in R itself,
like
much of its functionality. Look at the functions 'lda' and
'predict.lda' in
this file for details.

Comments are sparse in most R code, from what I gather, but if you look in 
"Pattern Recognition and Neural Networks" by Brian Ripley (one of the 
authors of this package), you'll find a discussion in section 2.4 
'Predictive classification' that covers much of what's going on,
from what
I've been able to glean.

I hope that helps. There are certainly others out there who are more au 
fait with this than me.

-Frank Gibbons


At 05:47 PM 10/1/2003, you wrote:
>Wei Geng wrote:
>
>>I am new to R. Trying to find out how lda() {in MASS R1.8.0 Windows} was
>>implemented in R. Does anyone know where to find out lda source code ?
>>Thanks.
>
>Here:
>
>http://cran.r-project.org
>
>Hint: MASS is a *package*.  You want to view its *source*.
>
>Same with most other R packages.  Or just about anything else you want to 
>know about R.
>
>Cheers
>
>Jason
>--
>Indigo Industrial Controls Ltd.
>http://www.indigoindustrial.co.nz
>64-21-343-545
>jasont at indigoindustrial.co.nz
>
>______________________________________________
>R-help at stat.math.ethz.ch mailing list
>https://www.stat.math.ethz.ch/mailman/listinfo/r-help
PhD, Computational Biologist,
Harvard Medical School BCMP/SGM-322, 250 Longwood Ave, Boston MA 02115, USA.
Tel: 617-432-3555       Fax: 
617-432-3557       http://llama.med.harvard.edu/~fgibbons

You are using a *beta* version of R 1.8.0 and in that version 
lda.default is not visible to the user (hidden in a namespace).  You can 
access it though by using the ::: (triple colon) operator, as in
>  library(MASS)
>  MASS:::lda.default
Actually, the first library() call is not necessary.

-roger


Wei Geng wrote:
>I am new to R. Trying to find out how lda() {in MASS R1.8.0 Windows} was
>implemented in R. Does anyone know where to find out lda source code ?
>Thanks.
>
>Wei
>
>______________________________________________
>R-help at stat.math.ethz.ch mailing list
>https://www.stat.math.ethz.ch/mailman/listinfo/r-help
>
>  
>