[R] apply pairs function to multiple columns in a data frame

538280 at gmail.com 538280 at gmail.com
Sat Feb 11 05:53:28 CET 2012

You might find the pairs2 function in the TeachingDemos package useful.

On Fri, Feb 10, 2012 at 1:13 PM, jarvisma <marleyjarvis at gmail.com> wrote:
> I am very new to R and programming and thank you in advance for your patience
> and help with a complete novice!
> I am working with a large multivariate data set that has 10 explanatory
> environmental variables (e.g. temp, depth) and over 60 response variables
> (each is a separate species).  My data frame is set up like the simplified
> version below:
> JulianDay  Temperature  Salinity  Depth  Copepod  Barnacle  Gastropod
> Bivalve
> 222              12.1                    33            0.3         500
> 756             0                     178
> 222              12.3                    33.2         1.1        145
> 111             0                     0
> 223              11.1                    33.1         7            752
> 234             12                   0
> Where JulianDay, Temperature, Salinity, Depth, Copepod, Barnacle, Gastropod,
> and Bivalve are the column headers.
> I am using the pairs function in R to explore my data.  My data frame is
> named Sunset.
> Using this code:
> Z=cbind(Sunset$Copepod,Sunset[,c(1:10)])   #the first 10 columns of my data
> frame are explanatory variables such as temp
> Pairs.Copepod=pairs(Z,main="Copepods vs. explanatory variables",
> panel=panel.smooth)
> I get a great pair plot of Copepods vs. all of the 10 explanatory
> environmental variables.  I would like to do this for each of my 60+
> species.  I can't just make one big pair plot of all of my explanatory
> variables vs. all of my species because I have too many.  So instead I would
> like a separate pair plot for each species (each column of data after the
> first 10 columns of explanatory variables)
> I would like to be able to write a loop that creates all of these plots at
> once, but haven't been able to do so.  Ideally, each pair plot would have
> the main title be the column header (e.g. Copepod) for that plot.  I would
> love to include a way to save each pair plot as  separate jpeg to a folder
> on my desktop with a file name that includes the species name (e.g.
> Copepod).
> Again, I am very new to R and to programing so I would GREATLY appreciate
> anyone patient and kind enough to respond with lots of detail so I can
> hopefully follow your answer and suggestions.  I have searched but haven't
> been able to find a way to write a loop that uses each column of data, so I
> would love some help!
> Thank you!
> Marley
> --
> View this message in context: http://r.789695.n4.nabble.com/apply-pairs-function-to-multiple-columns-in-a-data-frame-tp4377425p4377425.html
> Sent from the R help mailing list archive at Nabble.com.
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Gregory (Greg) L. Snow Ph.D.
538280 at gmail.com

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