Thank's Pedro Madrones,
you're right that i have removed my name of the email (because of Spam, and
datas that i can't remove on the net).
Ok, i explain a bit more :

X is a centred matrix.
PCA summarise all variation of X into a few new variables called scores
T.These new variables are linearly weighted combinations
of the original X-variables.
The loadings P contain the weights used for each X variable and thus reveal
the influence of individual X-variables.
Is it ok ?

That's what give the nipals function of chemometrics package.

It's just that i don't understand how to use The T and P matrix to have the
component matrix.

i don't need explainations how to obtain P and T.... But in how to do E = X
– tp.
But maybe it's not there for this kind of questions, i am not from
chemometrics science.

***
Johannes E. S.



2011/12/5 Pedro Mardones <mardones.p@gmail.com>

> Perhaps you can try the examples given in
> http://www.jstatsoft.org/v18/i02 for getting a better idea about how
> the NIPALS algorithm works. BTW, yes,it looks like a homework question
> specially when your user name is "zz dd <void1999@gmail.com>" so you
> can't be recognized.
>
>
>
> On Mon, Dec 5, 2011 at 9:27 AM, zz dd <void1999@gmail.com> wrote:
> > Thank you for your brevity you don't have to say more things to show who
> > you are.
> > Else if you don't understand what we are talking about, you shouldn't  be
> > rude and insulting.
> > May be you are quite young please take time to read Nonaka and Takeuchi
> and
> > moreover Takanashi to uderstand the way to go from information to
> knowledge
> > to wisdom that's quite useful for IS / IT and should bring you a bit of
> > etiquette.
> > *I have a dream* *that one day this nation will rise up and live out the
> > true meaning of its creed : “We hold these truths to be self-evident :
> that
> > all men are created equal.”*
> >
> > Have a nice day.
> >
> > 2011/12/5 Jeff Newmiller <jdnewmil@dcn.davis.ca.us>
> >
> >> This is not a homework help list.
> >>
> ---------------------------------------------------------------------------
> >> Jeff Newmiller                        The     .....       .....  Go
> Live...
> >> DCN:<jdnewmil@dcn.davis.ca.us>        Basics: ##.#.       ##.#.  Live
> >> Go...
> >>                                      Live:   OO#.. Dead: OO#..  Playing
> >> Research Engineer (Solar/Batteries            O.O#.       #.O#.  with
> >> /Software/Embedded Controllers)               .OO#.       .OO#.
>  rocks...1k
> >>
> ---------------------------------------------------------------------------
> >> Sent from my phone. Please excuse my brevity.
> >>
> >> zz dd <void1999@gmail.com> wrote:
> >>
> >> >Hello
> >> >The solution maybe there but i need to compute it into R if someone can
> >> >help me :
> >> >(Previously store score vector t in score matrix T; store loading
> >> >vector p
> >> >in loading matrix P) that's done by nipals in chemometrics
> >> >After use of nipals function you have T and P matrix
> >> >
> >> >First : "Calculate the residual matrix of X. Stop if the elements of
> >> >Xres
> >> >are very small
> >> >because no further PCA components are reasonable" :
> >> >Xres= X-u.b(T)
> >> >
> >> >u : improved score vector
> >> >b: loading vector
> >> >X : a mean-centered matrix
> >> >
> >> >Second : Replace X with Xres and continue with step 2 (with nipals
> >> >chemometrics...) for calculation of the next PCA
> >> >component.
> >> >
> >> >If someone can help me ?
> >> >Thank's a lot
> >> >
> >> >
> >> >2011/12/1 zz dd <void1999@gmail.com>
> >> >
> >> >> Hello
> >> >> i need some precision about nipals in the chemometrics package in R .
> >> >>
> >> >> When i use nipals in chemometrics i obtain T and P matrix.
> >> >>
> >> >> I really don't understand what to do with these two matrix to obtain
> >> >> the scores for every the component (like in spss fo example)
> >> >>
> >> >>             Comp1    Comp2   Comp3
> >> >> quest1 0,8434      0,54333   0,3466
> >> >> quest2 0,665       0,7655      0,433
> >> >>
> >> >> Thank you very much for your help
> >> >> (I know that X=TP+E)... But don't understand else....
> >> >>
> >> >
> >> >       [[alternative HTML version deleted]]
> >> >
> >> >______________________________________________
> >> >R-help@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.
> >>
> >>
> >
> >        [[alternative HTML version deleted]]
> >
> >
> > ______________________________________________
> > R-help@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.
> >
>

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