Support Vector Machines

This question is still unanswered.

Someone can explain me how use the svm function to make density estimation ? 

Thanks ...
Hi,
i try to use function svm of package e1071 to estimate a density.

But if my data are X=(X1,...,Xn) and m<-svm(X) some values of m$SV are
less than 0.
I don't see how i can get the estimation of the density with this
function.

Thanks for your help.

R?mi

View this message in context: http://www.nabble.com/Support-Vector-Machines-tp19069442p23366761.html
Sent from the R help mailing list archive at Nabble.com.

This question is still unanswered.
Unanswered questions are often those which do not comply with the  
guidelines in the Posting Guide. Many people have gotten tired of  
either making up examples or of writing  "Read the Posting Guide", so  
they just ignore them.
Someone can explain me how use the svm function to make density  
estimation ?
If you post an executable bit of code that shows how you are doing  
those operations, then I suspect someone will answer.

Hi,
i try to use function svm of package e1071 to estimate a density.

But if my data are X=(X1,...,Xn) and m<-svm(X) some values of m$SV  
are
less than 0.
I don't see how i can get the estimation of the density with this
function.

Thanks for your help.

R?mi

David Winsemius, MD
Heritage Laboratories
West Hartford, CT
In the R-help of the svm function of the package e1071 it's explained that
this function also makes estimation of density.

But when i made for example
X<-rnorm(1000)
m<-svm(X)

I just have a binary classification of X like SVM do whereas i want an
estimation of the density which generates our sample X ...

I don't know if it's possible and if someone has already use this function
to do that.

Thanks.

On May 4, 2009, at 8:52 AM, excalibur wrote:

This question is still unanswered.
Unanswered questions are often those which do not comply with the  
guidelines in the Posting Guide. Many people have gotten tired of  
either making up examples or of writing  "Read the Posting Guide", so  
they just ignore them.

Someone can explain me how use the svm function to make density  
estimation ?
If you post an executable bit of code that shows how you are doing  
those operations, then I suspect someone will answer.

excalibur wrote:

Hi,
i try to use function svm of package e1071 to estimate a density.

But if my data are X=(X1,...,Xn) and m<-svm(X) some values of m$SV  
are
less than 0.
I don't see how i can get the estimation of the density with this
function.

Thanks for your help.

R?mi

David Winsemius, MD
Heritage Laboratories
West Hartford, CT

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

View this message in context: http://www.nabble.com/Support-Vector-Machines-tp19069442p23382683.html
Sent from the R help mailing list archive at Nabble.com.

In the R-help of the svm function of the package e1071 it's  
explained that
this function also makes estimation of density.

But when i made for example
X<-rnorm(1000)
m<-svm(X)

I just have a binary classification of X like SVM do whereas i want an
estimation of the density which generates our sample X ...

I don't know if it's possible and if someone has already use this  
function
to do that.
Use str() to look at the object returned by svm. The example in svm's  
help page uses the svm object's "index" variable although there are  
other components that are available for extraction. The "fitted"  
vector looks to have similar binary properties to "index" and the "SV"  
vector appears to be a distance measure.
David

>
>
> Thanks.
>
>
> David Winsemius wrote:
>>
>>
>> On May 4, 2009, at 8:52 AM, excalibur wrote:
>>
>>>
>>> This question is still unanswered.
>>
>> Unanswered questions are often those which do not comply with the
>> guidelines in the Posting Guide. Many people have gotten tired of
>> either making up examples or of writing  "Read the Posting Guide", so
>> they just ignore them.
>>
>>
>>> Someone can explain me how use the svm function to make density
>>> estimation ?
>>
>> If you post an executable bit of code that shows how you are doing
>> those operations, then I suspect someone will answer.
>>
>> excalibur wrote:
>>>
>>>>
>>>> Hi,
>>>> i try to use function svm of package e1071 to estimate a density.
>>>>
>>>> But if my data are X=(X1,...,Xn) and m<-svm(X) some values of m$SV
>>>> are
>>>> less than 0.
>>>> I don't see how i can get the estimation of the density with this
>>>> function.
>>>>
>>>> Thanks for your help.
>>>>
>>>> R?mi
>>>>
>>
>> David Winsemius, MD
>> Heritage Laboratories
>> West Hartford, CT
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
>
> -- 
> View this message in context: http://www.nabble.com/Support-Vector-Machines-tp19069442p23382683.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
Heritage Laboratories
West Hartford, CT
I see that index is giving me the group for the classification problem.

But my problem is not the same. I had a sample X<-rnorm(1000) for example.

I don't want to make classification (i have only one group in fact) but i
want to estimate the density which generates my sample (like i can do with
others methods like kernel density estimation, wavelets estimations, splines
...). 

So, logically, i hope i will find an approximation of the Gaussian density.

But i don't see how i can obtain this density estimation with the function
svm.

Thanks

On May 5, 2009, at 3:49 AM, excalibur wrote:

In the R-help of the svm function of the package e1071 it's  
explained that
this function also makes estimation of density.

But when i made for example
X<-rnorm(1000)
m<-svm(X)

I just have a binary classification of X like SVM do whereas i want an
estimation of the density which generates our sample X ...

I don't know if it's possible and if someone has already use this  
function
to do that.
Use str() to look at the object returned by svm. The example in svm's  
help page uses the svm object's "index" variable although there are  
other components that are available for extraction. The "fitted"  
vector looks to have similar binary properties to "index" and the "SV"  
vector appears to be a distance measure.

-- 
David

Thanks.

David Winsemius wrote:

On May 4, 2009, at 8:52 AM, excalibur wrote:

This question is still unanswered.
Unanswered questions are often those which do not comply with the
guidelines in the Posting Guide. Many people have gotten tired of
either making up examples or of writing  "Read the Posting Guide", so
they just ignore them.

Someone can explain me how use the svm function to make density
estimation ?
If you post an executable bit of code that shows how you are doing
those operations, then I suspect someone will answer.

excalibur wrote:

Hi,
i try to use function svm of package e1071 to estimate a density.

But if my data are X=(X1,...,Xn) and m<-svm(X) some values of m$SV
are
less than 0.
I don't see how i can get the estimation of the density with this
function.

Thanks for your help.

R?mi

David Winsemius, MD
Heritage Laboratories
West Hartford, CT

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

-- 
View this message in context:
http://www.nabble.com/Support-Vector-Machines-tp19069442p23382683.html
Sent from the R help mailing list archive at Nabble.com.

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

View this message in context: http://www.nabble.com/Support-Vector-Machines-tp19069442p23386300.html
Sent from the R help mailing list archive at Nabble.com.
svm() in the e1071 package is an interface to the libsvm code.  Look at the link provided in the help page for that function.  You will have to read up how density estimation is achieved via one-class SVM.

Andy 

From: excalibur
In the R-help of the svm function of the package e1071 it's 
explained that
this function also makes estimation of density.

But when i made for example
X<-rnorm(1000)
m<-svm(X)

I just have a binary classification of X like SVM do whereas i want an
estimation of the density which generates our sample X ...

I don't know if it's possible and if someone has already use 
this function
to do that.

Thanks.

David Winsemius wrote:

On May 4, 2009, at 8:52 AM, excalibur wrote:

This question is still unanswered.
Unanswered questions are often those which do not comply with the  
guidelines in the Posting Guide. Many people have gotten tired of  
either making up examples or of writing  "Read the Posting 
Guide", so  
they just ignore them.

Someone can explain me how use the svm function to make density  
estimation ?
If you post an executable bit of code that shows how you are doing  
those operations, then I suspect someone will answer.

excalibur wrote:

Hi,
i try to use function svm of package e1071 to estimate a density.

But if my data are X=(X1,...,Xn) and m<-svm(X) some 
values of m$SV  
are
less than 0.
I don't see how i can get the estimation of the density with this
function.

Thanks for your help.

R?mi

David Winsemius, MD
Heritage Laboratories
West Hartford, CT

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

-- 
View this message in context: 
http://www.nabble.com/Support-Vector-Machines-tp19069442p23382683.html
Sent from the R help mailing list archive at Nabble.com.

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide 
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Notice:  This e-mail message, together with any attachme...{{dropped:12}}
there is a SVM function in svmpath?by Trevor?Hastie. Before use it take time to read this 

http://www-stat.stanford.edu/~hastie/Papers/svmpath.pdf

If you install then svmpath library ! run the attach source file.

Justin BEM
BP 1917 Yaound?
T?l (237) 99597295
(237) 22040246 

________________________________
De : excalibur <servien.remi12 at yahoo.fr>
? : r-help at r-project.org
Envoy? le : Mardi, 5 Mai 2009, 8h49mn 49s
Objet?: Re: [R] Support Vector Machines

In the R-help of the svm function of the package e1071 it's explained that
this function also makes estimation of density.

But when i made for example
X<-rnorm(1000)
m<-svm(X)

I just have a binary classification of X like SVM do whereas i want an
estimation of the density which generates our sample X ...

I don't know if it's possible and if someone has already use this function
to do that.

Thanks.

On May 4, 2009, at 8:52 AM, excalibur wrote:

This question is still unanswered.
Unanswered questions are often those which do not comply with the? 
guidelines in the Posting Guide. Many people have gotten tired of? 
either making up examples or of writing? "Read the Posting Guide", so? 
they just ignore them.

Someone can explain me how use the svm function to make density? 
estimation ?
If you post an executable bit of code that shows how you are doing? 
those operations, then I suspect someone will answer.

excalibur wrote:

Hi,
i try to use function svm of package e1071 to estimate a density.

But if my data are X=(X1,...,Xn) and m<-svm(X) some values of m$SV? 
are
less than 0.
I don't see how i can get the estimation of the density with this
function.

Thanks for your help.

R?mi

David Winsemius, MD
Heritage Laboratories
West Hartford, CT

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

View this message in context: http://www.nabble.com/Support-Vector-Machines-tp19069442p23382683.html
Sent from the R help mailing list archive at Nabble.com.

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.