[R] Getting column names in the titles of histograms generated automatically

[Richard M. Heiberger]

tmp <- data.frame(a=rnorm(10), b=rnorm(10))
for (i in names(tmp)) hist(tmp[[i]], main=paste("histogram of", i))


On Wed, Jan 7, 2015 at 10:13 PM, John Sorkin
<JSorkin at grecc.umaryland.edu> wrote:
> I am trying to automatically produce a series of histograms from every column of data frame with many columns.
> The columns names of a shortened from of the data frame follow:
>
>
> colnames<-names(smdata)
> colnames
> [1] "X13594_pre" "X15568_pre"
>
>
> I want to have
> X13594_pre in the title of the first histogram and
> X15568_pre in the title of the second histogram.
>
>
> I use the following code to automatically generate my histograms:
>
>
> for (i in 1:2){hist(smdata[,colnames[i]])}
>
>
> The titles of the histograms produced are:
> Histogram of smdata[,colnames[i]]
> and
> Histogram of smdata[,colnames[i]]
>
>
> How can I get the titles
> Histogram of smdata[,X13594_pre]
> and
> Histogram of smdata[,X15568_pre]
>
>
> John David Sorkin M.D., Ph.D.
> Professor of Medicine
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> (Phone) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)
>
>
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