R help - Sep 2006 - X-axis labels in histograms drawn by the "truehist" function

Hi,

 

I have a simple problem that I would appreciate getting some tips.  I am
using the "truehist" function within an "apply" call to plot
multiple
histograms.  I can't figure out how to get truehist to use the column names
of the matrix as the labels for the x-axis of the histograms.  

 

Here is a simple example:

 

 

X <- matrix(runif(4000),ncol=4)

colnames(X) <- c("X1","X2","X3","X4")

par(mfrow=c(2,2))

apply(X, 2, function(x)truehist(x))

 

In this example, I would like the x-labels of the histograms to be
"X1",
"X2", etc.

 

Any help is appreciated.

 

Best,

Ravi.

----------------------------------------------------------------------------
-------

Ravi Varadhan, Ph.D.

Assistant Professor, The Center on Aging and Health

Division of Geriatric Medicine and Gerontology 

Johns Hopkins University

Ph: (410) 502-2619

Fax: (410) 614-9625

Email: rvaradhan@jhmi.edu

Webpage:  http://www.jhsph.edu/agingandhealth/People/Faculty/Varadhan.html

 

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Try this:

f <- function(x,xlab) truehist(x, xlab = xlab)
mapply(f, as.data.frame(X), colnames(X))


On 9/29/06, Ravi Varadhan <rvaradhan at jhmi.edu>
wrote:
> Hi,
>
>
>
> I have a simple problem that I would appreciate getting some tips.  I am
> using the "truehist" function within an "apply" call to
plot multiple
> histograms.  I can't figure out how to get truehist to use the column
names
> of the matrix as the labels for the x-axis of the histograms.
>
>
>
> Here is a simple example:
>
>
>
>
>
> X <- matrix(runif(4000),ncol=4)
>
> colnames(X) <-
c("X1","X2","X3","X4")
>
> par(mfrow=c(2,2))
>
> apply(X, 2, function(x)truehist(x))
>
>
>
> In this example, I would like the x-labels of the histograms to be
"X1",
> "X2", etc.
>
>
>
> Any help is appreciated.
>
>
>
> Best,
>
> Ravi.
>
>
----------------------------------------------------------------------------
> -------
>
> Ravi Varadhan, Ph.D.
>
> Assistant Professor, The Center on Aging and Health
>
> Division of Geriatric Medicine and Gerontology
>
> Johns Hopkins University
>
> Ph: (410) 502-2619
>
> Fax: (410) 614-9625
>
> Email: rvaradhan at jhmi.edu
>
> Webpage:  http://www.jhsph.edu/agingandhealth/People/Faculty/Varadhan.html
>
>
>
>
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> --------
>
>
>
>
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>
> ______________________________________________
> R-help at stat.math.ethz.ch 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.
>

Hi,

 

I had sent this email last week, but received no reply.  So, I am resending
it - please excuse me for the redundant email.

 

I have a simple problem that I would appreciate getting some tips.  I am
using the "truehist" function within an "apply" call to plot
multiple
histograms.  I can't figure out how to get truehist to use the column names
of the matrix as the labels for the x-axis of the histograms.  

 

Here is a simple example:

 

library(MASS)  # this contains the truehist function

X <- matrix(runif(4000),ncol=4)

colnames(X) <- c("X1","X2","X3","X4")

par(mfrow=c(2,2))

apply(X, 2, function(x)truehist(x))

 

In this example, I would like the x-labels of the histograms to be
"X1",
"X2", etc.

 

Any help is appreciated.

 

Best,

Ravi

 

----------------------------------------------------------------------------
-------

Ravi Varadhan, Ph.D.

Assistant Professor, The Center on Aging and Health

Division of Geriatric Medicine and Gerontology 

Johns Hopkins University

Ph: (410) 502-2619

Fax: (410) 614-9625

Email: rvaradhan@jhmi.edu

Webpage:  http://www.jhsph.edu/agingandhealth/People/Faculty/Varadhan.html

 

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