[R] xyplot lines goes forth and backwards

[jim holtman]

My guess is (since no data was supplied) is that the data is not
sorted into date order.  Can you provide a subset of the data that
exhibits the problem?  It may just be a matter of sorting your
dataframe into date order before doing the plots.

On Mon, Oct 26, 2009 at 9:14 AM, marcos carvajalino
<maancafe240 at gmail.com> wrote:
> Hi,
>
> This is my first post in this page althougt i've been using R for several
> months (by the way english is not my native language so sorry about the
> grammar).
>
> I have a problem with a xyplot on lattice, it's supossed to print different
> lines for each river (Rio) conditioned by a chemical parameter (Var) and the
> state at which it's located (Dpto) against the year the sample were taken
> (Año)...actually it's doing quite right but the thing is that certarin lines
> tendo to go first to a distant value and back to the supossed next value in
> the series, e.g. the line goes from the value of 2002 to the value of 2004
> and then back to the value of 2003 when it's supossed to go 2002 then 2003
> then 2004!!
>
> here is the code and the structure of the DB i'm using..
>
>>car<-read.csv2("Historicos.csv")
>>str(car)
> 'data.frame':   1818 obs. of  6 variables:
>  $ Dpto  : Factor w/ 11 levels "ANTIOQUIA","ATLÁNTICO",..: 1 1 1 1 1 1 1 1 1
> 2 ...
>  $ Rio   : Factor w/ 43 levels "Acandí","Anchicayá",..: 30 31 8 43 20 24 25
> 13 4 26 ...
>  $ Var   : Factor w/ 13 levels "CAUDAL","CD",..: 1 1 1 1 1 1 1 1 1 1 ...
>  $ Valor : num  13.1 3 3 2.9 2.8 ...
>  $ Año   : int  2002 2002 2002 2002 2002 2002 2002 2002 2002 2002 ...
>  $ Región: Factor w/ 2 levels "CARIBE","PACIFICO": 1 1 1 1 1 1 1 1 1 1 ...
>
> #And the code for the plot
>
> xyplot(Valor~Año|Dpto+Var,groups=Rio,data=car,
> layout=c(4,3),scale=list(y=list(relation="free")),type="b",
> skip=c(rep(F,11),T))
>
> 2- Actually i've another question concerning the same code, i also have to
> plot the sum of each of the values for a given year (cause they're mass
> loadings of pollutants), e.g. for each year with variable "DBO" and state
> "MAGDALENA" i've to sum the values and show them as a single point in a
> plot, i tried this but it's not working
>
> xyplot(sum(Valor,na.rm=T)~Año|Dpto+Var,groups=Rio,data=na.omit(car),
> layout=c(3,3),scale=list(y=list(relation="free")),type="p")
>
> Could someone please tell me what i'm doing wrong and how to correct this,
> please it's for a report i've to submit on Friday so please help me!!!
> --
> Marcos Antonio Carvajalino Fernández
> Estudiante de Ingeniería Ambiental y Sanitaria
> Universidad del Magdalena, Colombia
>
>        [[alternative HTML version deleted]]
>
>
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>
>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?