[R] How to automate creation of plots (create series of plots)

[R. Michael Weylandt]

I'm not quite sure what you are asking -- when you say an XY plot I
presume you mean a scatter plot of X against Y, but how do the values
underneath the headers play in? Do you just want different symbols?

With a little bit of data wrangling, I think this actually seems quite
well suited to the ggplot2 paradigm, but here's one way to approach it
in base graphics:

for(i in 3:NCOL(dat)){
    plot(dat$X, dat$Y, pch = dat[,i], main = paste("Parameter", names(dat)[i]))
}

Michael



On Thu, Apr 12, 2012 at 1:38 PM, Magdalena A. Tkacz
<magdalena.tkacz at gmail.com> wrote:
> Hi All.
>
> I have problem with generating series of plots. In detail:
>
> I have file of data which I insert into dataframe:
> data<-read.table("file.txt", header=TRUE, sep=" ")
>
> Data in this file are prepared in such a way, that the header of each
> column has a value of one of examined parameter - something like that:
>      X     Y           01.0    01.1   01.2   01.5  01.6   02.0
> 1  11.74 10.71      16      16      16      1        16    16
> 2  12.43 10.97      16      16      16      1        1      16
> 3  11.63 11.92      16      16       1       1        16    1
>
> I need to generate a XY plot for each column (I need to observe
> changes in context of parameter (header names) change).
> Each column  has a few values and it is reflected in point's shape (pch).
> I'm doing this using (example for fourth column):
>
> plot(data$X~data$Y,main="Parameter, 01.1", pch=data$01.1)
>
> In this way I have different point shape and value of parameter in
> main plot label.
>
>
> For the first few columns it is:
> plot(data$X~data$Y,main="Parameter, 01.0", pch=data$Pr.01.0)
>
> plot(data$X~data$Y,main="Parameter, 1.1", pch=data$Pr.01.1)
>
> plot(data$X~data$Y,main="Parameter, 1.2", pch=data$Pr.01.2)
> I use it together with par(mfrow=c(3,2)), so I have 6 plots at a time.
>
> My question is:
> How can I automate creation od plots?
> The values in headers are not a series - they should be read from
> header, because I can not prepare them in one or two "for" loops. (1.2
> and next can be 1.5 next 2.0 next 2.7 -certain values are not
> predictable)
>
> The problem is that I have a lot of columns (now 57, sometimes - about
> 100, without initial filtering - more than 300).
> Now I manually rewrite parameter value and copy line "plot(...)". It
> is very laborious work, and I think it can be automated.
>
> Does anyone has an idea how can I use data frame headers as parameters
> in plot (legend and parameter of pch)?
> I'm sure that it will be "for" loop - I know how many plots I need,
> but what inside "for" (combining data frame header and plot
> parameter)?
>
> Regards
>
> --
> /|/| _ _ _/_ /_   _  /  / _ __
> /   |(/(/(/(/((-/)(/ (  /((/( /_
>      _/
> Magdalena Tkacz
>
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