Hi,
The problem solved!
thank you very much !!!
Kane, 
the command   > is.na(dados) <- dados == -999.9,    substituting missing values 
​​(-999.9) for NA


> From: dcarl...@tamu.edu
> To: jrkrid...@inbox.com; aprendizprog...@hotmail.com; r-help@r-project.org
> Subject: RE: [R] help error histograma
> Date: Fri, 10 Aug 2012 11:25:24 -0500
> 
> Now that John has put your data into a readable format, there are a number of 
> issues with your histogram that don't make much sense. You have enlarged the 
> text of the labels and greatly enlarged the size of the title, but then 
> printed no title (you have cex.main=6 and main="") and you have set 
> probability=TRUE to get a density plot, but then labeled the axis with 
> ylab="frequência" indicating it is a frequency plot. Also at .5 intervals 
> the bars are very small. You might try the following alternative:
> 
> hist(dados[[1]], 0:110, xlab="chuva (mm/dia)", ylab="frequência", main="", 
> las=1)
> 
> -------
> David
> 
> > -----Original Message-----
> > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r-
> > project.org] On Behalf Of John Kane
> > Sent: Friday, August 10, 2012 9:54 AM
> > To: aprendiz programa; r-help@r-project.org
> > Subject: Re: [R] help error histograma
> > 
> > 
> >    Thank you but it is not a good idea to send attachments.  I received
> > them
> >    because the email came directly to me butw probablyw others did not
> > because
> >    the R-list usually removes them to protect against viruses.  It is
> > better to
> >    put everything in the email.
> >    I have included your  code and data below.
> >    I  do not understand what some of your code is doing but the
> > immediate
> >    problem is that your data has a range of 0 - 109 and you have a seq
> > of
> >    seq(0,80,0.5) in the hist command
> >    Change to seq(0,110,0.5) and it should work.
> >    What is this supposed to do?
> >    is.na(dados) <- dados == -999.9
> > 
> > 
> > 
> >    John Kane
> >    Kingston ON Canada
> >    #=============Original Code=====================#
> > 
> >    library(MASS)
> >    dados<-read.table("/home/john/rdata/pelotas.txt",header=FALSE)
> >    is.na(dados) <- dados == -999.9  # what the devil? jrk
> >    png(filename="teste1.png",width=600,height=600)
> >    par(mfrow=c(2,1))
> >    #breaks<- seq(0,max(dados[[1]],by=0.5))
> >    hist(dados[[1]],seq(0,110,0.5),         prob=TRUE),
> > xlab="chuva
> >    (mm/dia)",ylab="frequência",           main="",
> > cex.lab=1.6,
> >    cex.sub=3,cex.axis=3,cex.main=6)
> >     # calculo do quantil ou percentil de 90%
> >    q=quantile(dados[1],0.90,na.rm=T)
> >    #===============================================
> >    dados  <-   dput(dados)
> >    structure(list(V1 = c(0, 0.4, 0, 0, 0.4, 0, 0, 0, 0, 0, 1, 0,
> >    0, 0.4, 5, 16, 0, 6.6, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 9.8,
> >    10.6, 5.6, 2.2, 3.2, 0, 0, 0.1, 0.3, 0, 15.8, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 30.5, 0, 0, 2.2, 44.8, 20.6,
> >    9, 3.6, 2.2, 0, 0.6, 0, 0, 0, 0, 0, 0, 0, 13.2, 0.6, 0, 0, 0,
> >    0, 0, 21.4, 0, 0, 3.4, 6.4, 0, 0, 0, 1, 0, 0, 0, 1.4, 0, 0, 0,
> >    0, 0, 7, 0.2, 1.4, 0, 0, 0, 13.4, 18.6, 3.6, 7, 1.7, 0, 0, 0,
> >    0, 0, 0, 0.2, 0, 0, 0, 77.6, 0, 22.6, 1.2, 15.4, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0.8, 33.2, 7, 6, 1.2, 0.4, 0.4, 0, 0, 0, 0.6, 74.8,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10.2, 3.6, 0.4, 1.2, 47.4, 0,
> >    0, 0, 0, 5.2, 8.2, 4.2, 9.8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 109,
> >    0, 0, 75.6, 16, 0, 0, 0, 0, 0, 4.2, 20.6, 19.2, 4.4, 4.4, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0.4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 16, 0, 0, 0, 0, 0, 3, 0.5, 0, 0, 0, 0, 0, 0, 1.8,
> >    54.6, 54, 3.4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 27.8,
> >    0, 9.8, 25.6, 21.8, 0.8, 0, 9.2, 43.2, 0, 18.6, 6.4, 0, 7, 0.8,
> >    0, 0, 0, 0, 0, 3.8, 0, 0, 43.4, 0.6, 3.2, 0, 0, 0.6, 14.8, 0,
> >    3.6, 0, 0, 0, 0, 3, 4.4, 0, 9.2, 0, 0, 0, 10.8, 0, 5, 12.6, 2.2,
> >    1.2, 0, 0, 0, 16.8, 21.4, 0, 0, 0, 0, 8.6, 0, 0, 0, 52.8, 0,
> >    0, 0, 0, 0, 0, 0, 2.2, 0, 0, 0, 14.8, 0.2, 0, 0, 0, 20.6, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 3, 11.8, 7.4, 0, 0,
> >    0, 0, 10, 0, 0.4, 0.2, 0, 9.2, 3.2, 0, 3.4, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0.4, 0.2, 0, 0, 0.4, 19.4, 6.8, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 1.8, 8.6, 5.4, 8.2, 24.4, 0, 20.6, 0, 0,
> >    0, 13.6, 0, 0, 5.8, 0, 0, 0, 0, 8, 77.2, 0, 0, 0, 0.4, 0, 0,
> >    0, 9, 0, 0, 38.8, 24.6, 0.4, 0, 8.6, 0.6, 0, 0, 0, 11.6, 2.2,
> >    0, 0, 0.2, 0, 0, 0, 0.2, 15, 0, 0, 0, 2, 62.4, 0, 0, 0, 0, 15.4,
> >    0, 28.8, 30.4, 0, 0, 0, 0, 0, 0, 0, 0, 11, 13.8, 0.6, 0, 34.6,
> >    0, 5, 0.2, 59, 19.6, 0, 3.2, 14, 0, 0, 0, 0, 5, 1, 0, 19.2, 6.2,
> >    1.5, 0, 0, 8.8, 14.6, 0, 0.4, 0.2, 0, 0, 0, 4.6, 0, 0, 14.2,
> >    0.4, 0, 0, 0, 0, 1.2, 0, 0, 0, 0, 2.2, 8.2, 0, 7.8, 0, 8, 19,
> >    0, 0, 0.6, 36.2, 5, 0, 0, 6.8, 4.4, 70.6, 16.8, 0, 4.2, 37.6,
> >    81.2, 0, 0, 0, 0, 2, 0, 49.8, 0, 3.8, 2.4, 2.6, 0, 0, 4.8, 0,
> >    0, 62.2, 2.6, 0, 0, 0, 0, 0, 0, 0, 0, 0.2, 0, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 18.4, 0, 0, 10.2, 0, 0, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 20.8, 52.2, 69.4, 0, 22, 0, 4.4, 0.6, 14.8,
> >    1, 0, 0, 1.2, 0, 0, 0, 12.2, 0, 0, 0, 16.4, 31.8, 0, 0, 49, 36.2,
> >    1, 10.8, 5.4, 0, 0, 0, 0, 7.6, 0, 32, 0.6, 0, 3, 2.4, 0, 0.2,
> >    0, 0, 2.4, 21.8, 0, 0, 0, 1, 0, 0, 0, 0, 2, 17.4, 0, 0, 0, 19,
> >    24.8, 6.6, 0, 0, 0, 1.4, 0, 0, 0, 0, 0, 0, 0, 0, 7.4, 0, 0, 0,
> >    0, 0, 8.6, 9.8, 45, 20.4, 0, 7.4, 4.6, 0.2, 0, 0, 0, 9, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 18.2, 5.6, 3, 0, 0, 20, 0, 0, 0, 0,
> >    0, 0, 0, 0, 3.4, 5.4, 51.6, 0.4, 0, 0, 0, 0, 0, 3, 102, 0, 4.8,
> >    0, 0, 1.6, 0, 0, 65.2, 0.6, 0, 0.4, 0, 0, 0, 0.4, 5.4, 2, 0,
> >    0, 0, 0, 0, 0, 2.6, 4.2, 0, 0, 14.4, 0, 0, 0, 0, 0, 0, 18.2,
> >    0, 0, 0, 0, 0, 0, 5, 3.2, 26.4, 16.4, 0, 0, 0, 0, 0, 0, 0, 0,
> >    1.2, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 29.2, 51.6,
> >    2.6, 0, 0, 1.8, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5.8, 8.6, 0, 0,
> >    0, 0, 0, 0, 0, 0, 0, 0, 11.8, 0, 21.6, 41.6, 21.4, 0.3, 0, 3.6,
> >    0, 0.8, 0, 0, 1.8, 0, 1.6, 6.4, 0.2, 0, 0, 7.6, 0, 0, 0, 0, 0,
> >    0, 0, 0, 0, 6.8, 0, 0, 0, 0, 0, 13.4, 8.4, 2, 0, 0, 0, 0, 9.6,
> >    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7.6, 9.8, 2.2, 0, 17.4, 2, 1.4,
> >    0.6, 0.2, 0, 0, 0, 14.2, 0, 0, 22, 0, 17.8, 0, 7.4, 0, 0, 0,
> >    11.2, 0, 0, 0, 4.2, 0, 39, 13.2, 0.2, 0, 2.2, 0.3, 0, 0, 0, 0,
> >    0, 3.2, 0, 0, 0, 0, 0, 0.4, 0.8)), .Names = "V1", class =
> > "data.frame",
> >    row.names = c(NA,
> >    -1214L))
> > 
> >    -----Original Message-----
> >    From: aprendizprog...@hotmail.com
> >    Sent: Fri, 10 Aug 2012 17:08:17 +0300
> >    To: jrkrid...@inbox.com, r-help@r-project.org
> >    Subject: RE: [R] help error histograma
> > 
> >    is attached data and script
> >    > Date: Fri, 10 Aug 2012 05:53:45 -0800
> >    > From: jrkrid...@inbox.com
> >    > Subject: Re: [R] help error histograma
> >    > To: aprendizprog...@hotmail.com; kri...@ymail.com; r-help@r-
> > project.org
> >    >
> >    >  You  probably  need  to  post  the  data here, or somewhere such
> > as
> >    [url=http://www.mediafire.com/][b]MediaFire[/b][/url] for other
> > readers to
> >    examine.
> >    >
> >    > To post it here use dput() and paste the results into the email.
> >    >
> >    > John Kane
> >    > Kingston ON Canada
> >    >
> >    >
> >    > > -----Original Message-----
> >    > > From: aprendizprog...@hotmail.com
> >    > > Sent: Fri, 10 Aug 2012 16:08:16 +0300
> >    > > To: kri...@ymail.com, r-help@r-project.org
> >    > > Subject: Re: [R] help error histograma
> >    > >
> >    > >
> >    > > Hi,
> >    > > I checked using the summary, and my data has 1000
> > elementsranging from 0
> >    > > to 30 (values)
> >    > > but I do not understand the error
> >    > >
> >    > >
> >    > >> Date: Fri, 10 Aug 2012 11:18:01 +0900
> >    > >> From: kri...@ymail.com
> >    > >> To: aprendizprog...@hotmail.com
> >    > >> CC: r-help@r-project.org
> >    > >> Subject: Re: [R] help error histograma
> >    > >>
> >    > >> Hello,
> >    > >>
> >    > >> David L Carlson already suggested to you to check the range of
> > your
> >    > >> data. Did you do it?
> >    > >>
> >    > >> Regards
> >    > >>
> >    > >>
> >    > >>
> >    > >> Le 10/08/2012 09:36, aprendiz programa a icrit :
> >    > >>>
> >    > >>> Hi,
> >    > >>> My error isErro em hist.default(dados[[1]], freq = TRUE,
> > seq(0, 30,
> >    > >>> 0.5), prob = FALSE, : some 'x' not counted; maybe 'breaks' do
> > not
> >    > >>> span range of 'x'
> >    > >>> hist(dados[[1]],seq(0, 30, 0.5), prob=TRUE, xlab="chuva
> >    > >>> (mm/dia)",ylab="frequjncia", main="", cex.lab=1.6,
> >    > >>> cex.sub=3,cex.axis=3,cex.main=6)
> >    > >>> Someone help me?
> >    > >>> [[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
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> > code.
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