Perhaps this example will help.

 x <- factor(c('b','a','d'), levels=c('a','d','b'))
 y <- 1:3
 plot(x,y)

And compare with

 z <- factor(c('b','a','d'))
 plot(z,y)

In the first, the plot is in the order that I chose. In the second it is in the order that R chose -- and R chose it according to a built-in and reasonable rule.

-Don

At 6:30 PM +0200 2/21/10, Or Duek wrote:
Ok,
It seems that the problem lays in the order (as Ista mentioned),
But, when I ask R to order it he chooses to order it by size and not by the
specific order I mentioned when I built the vector.
Is it possible to tell him to keep the order as mentioned?
Thank you.


On Sun, Feb 21, 2010 at 6:16 PM, Ista Zahn <istaz...@gmail.com> wrote:

 Hi Or,
 I can't know for sure what your problem is without an example, but the
 first thing I would do is check to make sure that your labels are
 stored as an ordered factor (and that the order is correct). See
 ?factor for details.

 Best,
 Ista

 On Sun, Feb 21, 2010 at 10:57 AM, Or Duek <ord...@gmail.com> wrote:
 > Hi,
 > I created a simple data frame with one factor and one numerical variable.
 > The factor was actually a vector of names of techniques to trimm reaction
 > time data.
 > I want to create a plot that shows the value of F test for every trimming
 > method.
 > So the data frame has its trim factor (who has those labels
 > "mean","2500","2000","1500","1000","log","inverse","1SD","2SD")
 > and the numerical variable of the data frame has the F values for each
 one
 > of those trimming method.
 > When I ask R to plot it, it doesn't keep the order of the trimm verctor
 > correctly and the plot confuses the order so the most left one will be
 1500
 > and then 1SD etc.
 > The values are correct but it is important for me to keep it in the same
 > order I built it.
 > How can I do it?
 > Thank you very much,
 > > Or D.
 > >
 > >        [[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.
 >



 --
 Ista Zahn
 Graduate student
 University of Rochester
 Department of Clinical and Social Psychology
 http://*yourpsyche.org


        [[alternative HTML version deleted]]

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--
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062

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