R help - Aug 2009 - SVM coefficients

Hello,

I'm using the svm function from the e1071 package.

It works well and gives me nice results.

I'm very curious to see the actual coefficients calculated for each 
input variable.  (Other packages, like RapidMiner, show you this 
automatically.)

I've tried looking at attributes for the model and do see a 
"coefficients" item, but printing it returns an NULL result.

Can someone point me in the right direction?

Thanks

--
Noah

Hi,

On Sun, Aug 30, 2009 at 6:10 PM, Noah Silverman<noah at
smartmediacorp.com> wrote:
> Hello,
>
> I'm using the svm function from the e1071 package.
>
> It works well and gives me nice results.
>
> I'm very curious to see the actual coefficients calculated for each
input
> variable.  (Other packages, like RapidMiner, show you this automatically.)
>
> I've tried looking at attributes for the model and do see a
"coefficients"
> item, but printing it returns an NULL result.
Hmm .. I don't see a "coefficients" attribute, but rather a
"coefs"
attribute, which I guess is what you're looking for (?)

Run "example(svm)" to its end and type:

R> m$coefs
             [,1]
 [1,]  1.00884130
 [2,]  1.27446460
 [3,]  2.00000000
 [4,] -1.00000000
 [5,] -0.35480340
 [6,] -0.74043692
 [7,] -0.87635311
 [8,] -0.04857869
 [9,] -0.03721980
[10,] -0.64696793
[11,] -0.57894605

HTH,

-steve

-- 
Steve Lianoglou
Graduate Student: Computational Systems Biology
 | Memorial Sloan-Kettering Cancer Center
 | Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/~lianos/contact