[R] how to use a list to create a plot

[Petr PIKAL]

Hi

r-help-bounces at r-project.org napsal dne 21.07.2009 14:37:35:

> 
> 
> Graves, Gregory wrote:
> > I issued the following command to obtain the std dev for each month.
> > 
> > 
> > 
> > psd<-numSummary(Sal, groups=month, statistics=c("sd"))
> 
> 
> numSummary is not in base R, is it? If not, which package? Please read 
> the posting guide! Please provide reproducible code (we do not have Sal 
> etc.).
> 
> 
> 
> 
> > 
> > 
> > which resulted in
> > 
> > 
> > 
> >> psd
> > 
> >                 sd                           n              NA
> > 
> > 1              6.930340              9367 2319
> > 
> > 2              7.847003              10827 1008
> > 
> > 3              5.962308              12988  404
> > 
> > 4              3.632105              12576  384
> > 
> > 5              3.328189              13030  362
> > 
> > 6              10.101336            12955    5
> > 
> > 7              11.759585            13071  321
> > 
> > 8              10.277566            12286 1105
> > 
> > 9              8.561922              12286  674
> > 
> > 10           9.252890              13343   27
> > 
> > 11           9.568852              12591  369
> > 
> > 12           9.622851              12020  946
> > 
> > 
> > 
> >> typeof(psd)
> > 
> > [1] "list"
> > 
> 
> 
> I guess it is a data.frame.

I too, with row names 1:12. See str(psd).

> 
> Please read "An Introduction to R" or other introductory material in 
> orde3r to learn how to extract vectors from data.frames or lists.
> 
> In this case for both data.frames and lists:
> 
> psd[[1]] for first vector etc.
> 
> Uwe Ligges
> 
> 
> 
> 
> 
> > 
> > I want plot sd versus column 1 (month of year) of the list psd.
> > 

If row.names(psd) give you character vector 1:12, you can transfer it to 
numeric by as numeric. Than

plot(as.numeric(row.names(psd)), psd$sd)

can give you desired plot.

Regards
Petr



> > 
> > 
> > The only way I can figure out how to do this is to manually copy the
> > table into Excel, reformat, and then export that back out as a new 
csv.
> > There has to be a better way?
> > 
> > 
> > 
> > 
> > 
> > Gregory A. Graves
> > 
> > Lead Scientist
> > 
> > REstoration COoordination and VERification (RECOVER) 
> > 
> > Watershed Division
> > 
> > South Florida Water Management District
> > 
> > Phones:  DESK: 561 / 682 - 2429 
> > 
> >              CELL:  561 / 719 - 8157
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> >    [[alternative HTML version deleted]]
> > 
> > ______________________________________________
> > R-help at 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.
> 
> ______________________________________________
> R-help at 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.