[R] reference text variables as column name to plot

[jim holtman]

Where is the "column"?  Is it in a matrix/dataframe?  Why are you
trying to plot 12 points against 'z' which has 24 values?  You can
reference the column by:

plot(yourDF[, s])

where 's' is what you created as the column name.  Need to refer to
indexing in the Intro to R.

On Tue, Nov 30, 2010 at 11:40 AM, Graves, Gregory <ggraves at sfwmd.gov> wrote:
> Having given myself carpal tunnel looking for answer to this ...
>
>
>
> I have a dataset each column of which has 12 rows in it.  I created a
> variable 'z' as follows:
>
>
>
> z=1:24
>
>
>
> Since I have a large number of these plots to make, and they are a bit
> complex, I want to want to reference the column I want to plot via a
> variable containing the name of that column.  As follows:
>
>
>
> similar='1978'
>
> s=paste('Y',similar,sep='')
>
>
>
> variable s now contains 'Y1978' which is the name of one of the columns.
>
>
>
> However, when I try to plot
>
>
>
> plot(z,s,type='l')
>
>
>
> I get a 'x and y lengths differ' error because variable s is being
> recognized as 'Y1978' length=1, rather than the contents of the column
> Y1978 length=12.
>
>
>
> I tried all the usual tricks I know like &s.  How do you get R to
> reference a variable as a column name?
>
>
>
> Thank you.
>
>
>
> Gregory A. Graves, Lead Scientist
>
> Everglades REstoration COoordination and VERification (RECOVER)
>
> Restoration Sciences Department
>
> South Florida Water Management District
>
> Phones:  DESK: 561 / 682 - 2429
>
>                   CELL:  561 / 719 - 8157
>
>
>
>
>        [[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?