system solver in R

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system solver in R

Temel İspanyolca
Dea(R)

Do you know any system solver in R ?

For example, in matlab, is very easy

syms a b c x eqn = a*x^2 + b*x + c == 0; sol = solve(eqn)

How can I  find this type code in R (or directly solver)?

*Since(R)ely*
Engin YILMAZ

        [[alternative HTML version deleted]]

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Re: system solver in R

Berend Hasselman


R package Ryacas may be what you want.

Berend


> On 20 Nov 2018, at 09:42, Engin Yılmaz <[hidden email]> wrote:
>
> Dea(R)
>
> Do you know any system solver in R ?
>
> For example, in matlab, is very easy
>
> syms a b c x eqn = a*x^2 + b*x + c == 0; sol = solve(eqn)
>
> How can I  find this type code in R (or directly solver)?
>
> *Since(R)ely*
> Engin YILMAZ
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> [hidden email] mailing list -- To UNSUBSCRIBE and more, see
> 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.

______________________________________________
[hidden email] mailing list -- To UNSUBSCRIBE and more, see
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Re: system solver in R

Temel İspanyolca
Thanks a lot!

Berend Hasselman <[hidden email]>, 20 Kas 2018 Sal, 12:02 tarihinde şunu
yazdı:

>
>
> R package Ryacas may be what you want.
>
> Berend
>
>
> > On 20 Nov 2018, at 09:42, Engin Yılmaz <[hidden email]> wrote:
> >
> > Dea(R)
> >
> > Do you know any system solver in R ?
> >
> > For example, in matlab, is very easy
> >
> > syms a b c x eqn = a*x^2 + b*x + c == 0; sol = solve(eqn)
> >
> > How can I  find this type code in R (or directly solver)?
> >
> > *Since(R)ely*
> > Engin YILMAZ
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > [hidden email] mailing list -- To UNSUBSCRIBE and more, see
> > 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.
>
>

--
*Saygılarımla*
Engin YILMAZ

        [[alternative HTML version deleted]]

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Re: system solver in R

Temel İspanyolca
Dea(R)
I try to solve one equation but this program did not give me real roots
for example
yacas("Solve( 5/((1+x)^1) + 5/((1+x)^2) + 5/((1+x)^3) + 105/((1+x)^4) -105
==0, x)")
gave me following results
How can I find real roots?

expression(list(x == complex_cartesian((1/42 - ((1/63 -
((root(7339451281/3087580356,
    2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
    2))^(1/3)))/21 - -2/21)/(4 * root(((root(7339451281/3087580356,
    2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
    2))^(1/3) - 1/63)^2/4 + 1, 2)))/2 - 1, root(4 *
(((root(7339451281/3087580356,
    2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
    2))^(1/3) - 1/63)/2 + root(((root(7339451281/3087580356,
    2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
    2))^(1/3) - 1/63)^2/4 + 1, 2)) - (((1/63 -
((root(7339451281/3087580356,
    2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
    2))^(1/3)))/21 - -2/21)/(4 * root(((root(7339451281/3087580356,
    2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
    2))^(1/3) - 1/63)^2/4 + 1, 2)) - 1/42)^2, 2)/2),...more




Engin Yılmaz <[hidden email]>, 20 Kas 2018 Sal, 12:53 tarihinde şunu
yazdı:

> Thanks a lot!
>
> Berend Hasselman <[hidden email]>, 20 Kas 2018 Sal, 12:02 tarihinde şunu
> yazdı:
>
>>
>>
>> R package Ryacas may be what you want.
>>
>> Berend
>>
>>
>> > On 20 Nov 2018, at 09:42, Engin Yılmaz <[hidden email]> wrote:
>> >
>> > Dea(R)
>> >
>> > Do you know any system solver in R ?
>> >
>> > For example, in matlab, is very easy
>> >
>> > syms a b c x eqn = a*x^2 + b*x + c == 0; sol = solve(eqn)
>> >
>> > How can I  find this type code in R (or directly solver)?
>> >
>> > *Since(R)ely*
>> > Engin YILMAZ
>> >
>> >       [[alternative HTML version deleted]]
>> >
>> > ______________________________________________
>> > [hidden email] mailing list -- To UNSUBSCRIBE and more, see
>> > 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.
>>
>>
>
> --
> *Saygılarımla*
> Engin YILMAZ
>


--
*Saygılarımla*
Engin YILMAZ

        [[alternative HTML version deleted]]

______________________________________________
[hidden email] mailing list -- To UNSUBSCRIBE and more, see
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Re: system solver in R

J C Nash
A bit pedestrian, but you might try

pf <- function(x){5/((1+x)^1) + 5/((1+x)^2) + 5/((1+x)^3) + 105/((1+x)^4) -105}
uniroot(pf,c(-10,10))
curve(pf, c(-10,10))
require(pracma)
tryn <- newton(pf, 0)
tryn
pf(0)
pf(0.03634399)
yc <- c(-105, 5,5,5,105)
rooty <- polyroot(yc)
rooty
rootx <- 1/rooty - 1
rootx

There are lots of rootfinders, and the histoRicalg project (https://gitlab.com/nashjc/histoRicalg)
that is supported by the R Consortium to look into older codes has quite a bit on rootfinders.

JN

On 2018-11-20 7:09 a.m., Engin Yılmaz wrote:

>
>
> Dea(R)
> I try to solve one equation but this program did not give me real roots
> for example
> yacas("Solve( 5/((1+x)^1) + 5/((1+x)^2) + 5/((1+x)^3) + 105/((1+x)^4) -105
> ==0, x)")
> gave me following results
> How can I find real roots?
>
> expression(list(x == complex_cartesian((1/42 - ((1/63 -
> ((root(7339451281/3087580356,
>     2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>     2))^(1/3)))/21 - -2/21)/(4 * root(((root(7339451281/3087580356,
>     2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>     2))^(1/3) - 1/63)^2/4 + 1, 2)))/2 - 1, root(4 *
> (((root(7339451281/3087580356,
>     2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>     2))^(1/3) - 1/63)/2 + root(((root(7339451281/3087580356,
>     2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>     2))^(1/3) - 1/63)^2/4 + 1, 2)) - (((1/63 -
> ((root(7339451281/3087580356,
>     2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>     2))^(1/3)))/21 - -2/21)/(4 * root(((root(7339451281/3087580356,
>     2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>     2))^(1/3) - 1/63)^2/4 + 1, 2)) - 1/42)^2, 2)/2),...more
>
>
>
>
> Engin Yılmaz <[hidden email]>, 20 Kas 2018 Sal, 12:53 tarihinde şunu
> yazdı:
>
>> Thanks a lot!
>>
>> Berend Hasselman <[hidden email]>, 20 Kas 2018 Sal, 12:02 tarihinde şunu
>> yazdı:
>>
>>>
>>>
>>> R package Ryacas may be what you want.
>>>
>>> Berend
>>>
>>>
>>>> On 20 Nov 2018, at 09:42, Engin Yılmaz <[hidden email]> wrote:
>>>>
>>>> Dea(R)
>>>>
>>>> Do you know any system solver in R ?
>>>>
>>>> For example, in matlab, is very easy
>>>>
>>>> syms a b c x eqn = a*x^2 + b*x + c == 0; sol = solve(eqn)
>>>>
>>>> How can I  find this type code in R (or directly solver)?
>>>>
>>>> *Since(R)ely*
>>>> Engin YILMAZ
>>>>
>>>>       [[alternative HTML version deleted]]
>>>>
>>>> ______________________________________________
>>>> [hidden email] mailing list -- To UNSUBSCRIBE and more, see
>>>> 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.
>>>
>>>
>>
>> --
>> *Saygılarımla*
>> Engin YILMAZ
>>
>
>
> --
> *Saygılarımla*
> Engin YILMAZ
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> [hidden email] mailing list -- To UNSUBSCRIBE and more, see
> 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.
>

______________________________________________
[hidden email] mailing list -- To UNSUBSCRIBE and more, see
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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Re: system solver in R

Eik Vettorazzi-2
In reply to this post by Temel İspanyolca
How about this:

library(rootSolve)
f1<-function(x)5/((1+x)^1) + 5/((1+x)^2) + 5/((1+x)^3) + 105/((1+x)^4) -105
uniroot.all( f1,c(-1e6,1e6))

[1] -1.9881665  0.0363435

Cheers


Am 20.11.2018 um 13:09 schrieb Engin Yılmaz:

> Dea(R)
> I try to solve one equation but this program did not give me real roots
> for example
> yacas("Solve( 5/((1+x)^1) + 5/((1+x)^2) + 5/((1+x)^3) + 105/((1+x)^4) -105
> ==0, x)")
> gave me following results
> How can I find real roots?
>
> expression(list(x == complex_cartesian((1/42 - ((1/63 -
> ((root(7339451281/3087580356,
>      2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>      2))^(1/3)))/21 - -2/21)/(4 * root(((root(7339451281/3087580356,
>      2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>      2))^(1/3) - 1/63)^2/4 + 1, 2)))/2 - 1, root(4 *
> (((root(7339451281/3087580356,
>      2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>      2))^(1/3) - 1/63)/2 + root(((root(7339451281/3087580356,
>      2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>      2))^(1/3) - 1/63)^2/4 + 1, 2)) - (((1/63 -
> ((root(7339451281/3087580356,
>      2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>      2))^(1/3)))/21 - -2/21)/(4 * root(((root(7339451281/3087580356,
>      2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>      2))^(1/3) - 1/63)^2/4 + 1, 2)) - 1/42)^2, 2)/2),...more
>
>
>
>
> Engin Yılmaz <[hidden email]>, 20 Kas 2018 Sal, 12:53 tarihinde şunu
> yazdı:
>
>> Thanks a lot!
>>
>> Berend Hasselman <[hidden email]>, 20 Kas 2018 Sal, 12:02 tarihinde şunu
>> yazdı:
>>
>>>
>>>
>>> R package Ryacas may be what you want.
>>>
>>> Berend
>>>
>>>
>>>> On 20 Nov 2018, at 09:42, Engin Yılmaz <[hidden email]> wrote:
>>>>
>>>> Dea(R)
>>>>
>>>> Do you know any system solver in R ?
>>>>
>>>> For example, in matlab, is very easy
>>>>
>>>> syms a b c x eqn = a*x^2 + b*x + c == 0; sol = solve(eqn)
>>>>
>>>> How can I  find this type code in R (or directly solver)?
>>>>
>>>> *Since(R)ely*
>>>> Engin YILMAZ
>>>>
>>>>        [[alternative HTML version deleted]]
>>>>
>>>> ______________________________________________
>>>> [hidden email] mailing list -- To UNSUBSCRIBE and more, see
>>>> 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.
>>>
>>>
>>
>> --
>> *Saygılarımla*
>> Engin YILMAZ
>>
>
>

--
Eik Vettorazzi

Universitätsklinikum Hamburg-Eppendorf
Institut für Medizinische Biometrie und Epidemiologie

Martinistraße 52
Gebäude W 34
20246 Hamburg

Telefon: +49 (0) 40 7410 - 58243
Fax:     +49 (0) 40 7410 - 57790

Web: www.uke.de/imbe


--

_____________________________________________________________________

Universitätsklinikum Hamburg-Eppendorf; Körperschaft des öffentlichen Rechts; Gerichtsstand: Hamburg | www.uke.de
Vorstandsmitglieder: Prof. Dr. Burkhard Göke (Vorsitzender), Prof. Dr. Dr. Uwe Koch-Gromus, Joachim Prölß, Marya Verdel
_____________________________________________________________________

SAVE PAPER - THINK BEFORE PRINTING
______________________________________________
[hidden email] mailing list -- To UNSUBSCRIBE and more, see
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Re: system solver in R

Temel İspanyolca
Yes, it works for me.

Eik Vettorazzi <[hidden email]>, 21 Kas 2018 Çar, 00:19 tarihinde şunu
yazdı:

> How about this:
>
> library(rootSolve)
> f1<-function(x)5/((1+x)^1) + 5/((1+x)^2) + 5/((1+x)^3) + 105/((1+x)^4) -105
> uniroot.all( f1,c(-1e6,1e6))
>
> [1] -1.9881665  0.0363435
>
> Cheers
>
>
> Am 20.11.2018 um 13:09 schrieb Engin Yılmaz:
> > Dea(R)
> > I try to solve one equation but this program did not give me real roots
> > for example
> > yacas("Solve( 5/((1+x)^1) + 5/((1+x)^2) + 5/((1+x)^3) + 105/((1+x)^4)
> -105
> > ==0, x)")
> > gave me following results
> > How can I find real roots?
> >
> > expression(list(x == complex_cartesian((1/42 - ((1/63 -
> > ((root(7339451281/3087580356,
> >      2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
> >      2))^(1/3)))/21 - -2/21)/(4 * root(((root(7339451281/3087580356,
> >      2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
> >      2))^(1/3) - 1/63)^2/4 + 1, 2)))/2 - 1, root(4 *
> > (((root(7339451281/3087580356,
> >      2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
> >      2))^(1/3) - 1/63)/2 + root(((root(7339451281/3087580356,
> >      2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
> >      2))^(1/3) - 1/63)^2/4 + 1, 2)) - (((1/63 -
> > ((root(7339451281/3087580356,
> >      2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
> >      2))^(1/3)))/21 - -2/21)/(4 * root(((root(7339451281/3087580356,
> >      2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
> >      2))^(1/3) - 1/63)^2/4 + 1, 2)) - 1/42)^2, 2)/2),...more
> >
> >
> >
> >
> > Engin Yılmaz <[hidden email]>, 20 Kas 2018 Sal, 12:53 tarihinde
> şunu
> > yazdı:
> >
> >> Thanks a lot!
> >>
> >> Berend Hasselman <[hidden email]>, 20 Kas 2018 Sal, 12:02 tarihinde şunu
> >> yazdı:
> >>
> >>>
> >>>
> >>> R package Ryacas may be what you want.
> >>>
> >>> Berend
> >>>
> >>>
> >>>> On 20 Nov 2018, at 09:42, Engin Yılmaz <[hidden email]> wrote:
> >>>>
> >>>> Dea(R)
> >>>>
> >>>> Do you know any system solver in R ?
> >>>>
> >>>> For example, in matlab, is very easy
> >>>>
> >>>> syms a b c x eqn = a*x^2 + b*x + c == 0; sol = solve(eqn)
> >>>>
> >>>> How can I  find this type code in R (or directly solver)?
> >>>>
> >>>> *Since(R)ely*
> >>>> Engin YILMAZ
> >>>>
> >>>>        [[alternative HTML version deleted]]
> >>>>
> >>>> ______________________________________________
> >>>> [hidden email] mailing list -- To UNSUBSCRIBE and more, see
> >>>> 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.
> >>>
> >>>
> >>
> >> --
> >> *Saygılarımla*
> >> Engin YILMAZ
> >>
> >
> >
>
> --
> Eik Vettorazzi
>
> Universitätsklinikum Hamburg-Eppendorf
> Institut für Medizinische Biometrie und Epidemiologie
>
> Martinistraße 52
> Gebäude W 34
> 20246 Hamburg
>
> Telefon: +49 (0) 40 7410 - 58243
> Fax:     +49 (0) 40 7410 - 57790
>
> Web: www.uke.de/imbe
>
>
> --
>
> _____________________________________________________________________
>
> Universitätsklinikum Hamburg-Eppendorf; Körperschaft des öffentlichen
> Rechts; Gerichtsstand: Hamburg | www.uke.de
> Vorstandsmitglieder: Prof. Dr. Burkhard Göke (Vorsitzender), Prof. Dr. Dr.
> Uwe Koch-Gromus, Joachim Prölß, Marya Verdel
> _____________________________________________________________________
>
> SAVE PAPER - THINK BEFORE PRINTING
>


--
*Saygılarımla*
Engin YILMAZ

        [[alternative HTML version deleted]]

______________________________________________
[hidden email] mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
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Re: system solver in R

Peter Dalgaard-2
In reply to this post by Temel İspanyolca
Once you figure out how to decipher the output, you realise that it actually does give you all 4 roots, including the two real ones:

...
> a <- .Last.value
> complex_cartesian <- function(x,y) x+(0+1i)*y
> eval(a$text[[1]][[2]][[3]])
[1] -1.00028+0.988174i
> eval(a$text[[1]][[3]][[3]])
[1] -1.00028-0.988174i
> eval(a$text[[1]][[4]][[3]])
[1] 0.03634399
> eval(a$text[[1]][[5]][[3]])
[1] -1.988165

(No, I don't quite know what I am doing either...)

-pd


> On 20 Nov 2018, at 13:09 , Engin Yılmaz <[hidden email]> wrote:
>
> Dea(R)
> I try to solve one equation but this program did not give me real roots
> for example
> yacas("Solve( 5/((1+x)^1) + 5/((1+x)^2) + 5/((1+x)^3) + 105/((1+x)^4) -105
> ==0, x)")
> gave me following results
> How can I find real roots?
>
> expression(list(x == complex_cartesian((1/42 - ((1/63 -
> ((root(7339451281/3087580356,
>    2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>    2))^(1/3)))/21 - -2/21)/(4 * root(((root(7339451281/3087580356,
>    2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>    2))^(1/3) - 1/63)^2/4 + 1, 2)))/2 - 1, root(4 *
> (((root(7339451281/3087580356,
>    2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>    2))^(1/3) - 1/63)/2 + root(((root(7339451281/3087580356,
>    2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>    2))^(1/3) - 1/63)^2/4 + 1, 2)) - (((1/63 -
> ((root(7339451281/3087580356,
>    2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>    2))^(1/3)))/21 - -2/21)/(4 * root(((root(7339451281/3087580356,
>    2) - 4535/71442)^(1/3) - (4535/71442 + root(7339451281/3087580356,
>    2))^(1/3) - 1/63)^2/4 + 1, 2)) - 1/42)^2, 2)/2),...more
>
>
>
>
> Engin Yılmaz <[hidden email]>, 20 Kas 2018 Sal, 12:53 tarihinde şunu
> yazdı:
>
>> Thanks a lot!
>>
>> Berend Hasselman <[hidden email]>, 20 Kas 2018 Sal, 12:02 tarihinde şunu
>> yazdı:
>>
>>>
>>>
>>> R package Ryacas may be what you want.
>>>
>>> Berend
>>>
>>>
>>>> On 20 Nov 2018, at 09:42, Engin Yılmaz <[hidden email]> wrote:
>>>>
>>>> Dea(R)
>>>>
>>>> Do you know any system solver in R ?
>>>>
>>>> For example, in matlab, is very easy
>>>>
>>>> syms a b c x eqn = a*x^2 + b*x + c == 0; sol = solve(eqn)
>>>>
>>>> How can I  find this type code in R (or directly solver)?
>>>>
>>>> *Since(R)ely*
>>>> Engin YILMAZ
>>>>
>>>>      [[alternative HTML version deleted]]
>>>>
>>>> ______________________________________________
>>>> [hidden email] mailing list -- To UNSUBSCRIBE and more, see
>>>> 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.
>>>
>>>
>>
>> --
>> *Saygılarımla*
>> Engin YILMAZ
>>
>
>
> --
> *Saygılarımla*
> Engin YILMAZ
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> [hidden email] mailing list -- To UNSUBSCRIBE and more, see
> 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.

--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: [hidden email]  Priv: [hidden email]

______________________________________________
[hidden email] mailing list -- To UNSUBSCRIBE and more, see
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.