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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