R help - Mar 2006 - solving nonlinear system of equations

hi all

i have been searching through the archives in search for some help and it seems
to have been fruitless - thus the mail. i saw some mail relating to mathomatic
and maxima. mathomatic only works for simpel functions - as per the mail and
does not support logs ...- and i am not familiar with maxima. i would
preferably want to use an R function.



is there a function that can solve a system of non linear equations. i dont have
any data - ie as per nls.



so a trivial example would be:

exp(a) = v
log(v) = 0



and we need to solve for v and a.

hoping someone can help.
/
allan

Minimize the sum of the squares of the differences between the
two sides:

optim(c(1,1), function(x) exp(x[1]-x[2])^2 + log(x[2])^2)


On 3/24/06, allan_sta_staff_sci_main_uct at mail.uct.ac.za
<allan_sta_staff_sci_main_uct at mail.uct.ac.za>
wrote:
> hi all
>
> i have been searching through the archives in search for some help and it
seems
> to have been fruitless - thus the mail. i saw some mail relating to
mathomatic
> and maxima. mathomatic only works for simpel functions - as per the mail
and
> does not support logs ...- and i am not familiar with maxima. i would
> preferably want to use an R function.
>
>
>
> is there a function that can solve a system of non linear equations. i dont
have
> any data - ie as per nls.
>
>
>
> so a trivial example would be:
>
> exp(a) = v
> log(v) = 0
>
>
>
> and we need to solve for v and a.
>
> hoping someone can help.
> /
> allan
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
>

There was an error with the parentheses.  Here it is corrected:

 optim(c(1,1), function(x) (exp(x[1])-x[2])^2 + log(x[2])^2)


On 3/24/06, Gabor Grothendieck <ggrothendieck at gmail.com>
wrote:
> Minimize the sum of the squares of the differences between the
> two sides:
>
> optim(c(1,1), function(x) exp(x[1]-x[2])^2 + log(x[2])^2)
>
>
> On 3/24/06, allan_sta_staff_sci_main_uct at mail.uct.ac.za
> <allan_sta_staff_sci_main_uct at mail.uct.ac.za> wrote:
> > hi all
> >
> > i have been searching through the archives in search for some help and
it seems
> > to have been fruitless - thus the mail. i saw some mail relating to
mathomatic
> > and maxima. mathomatic only works for simpel functions - as per the
mail and
> > does not support logs ...- and i am not familiar with maxima. i would
> > preferably want to use an R function.
> >
> >
> >
> > is there a function that can solve a system of non linear equations. i
dont have
> > any data - ie as per nls.
> >
> >
> >
> > so a trivial example would be:
> >
> > exp(a) = v
> > log(v) = 0
> >
> >
> >
> > and we need to solve for v and a.
> >
> > hoping someone can help.
> > /
> > allan
> >
> > ______________________________________________
> > R-help at stat.math.ethz.ch mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
> >
>