R help - Oct 2002 - Changing pch spacing

Hello R-Helpers,

plot(x, y, type="b", pch="1")

plots x vs. y with both a line and the symbol "1" but how do I change
the "spacing" of the symbol being plotted. In other words, I don't
want
to plot the "1" at every data point, but only at every kth point
(things
get too cluttered when there are many data points). Thanks in advance!

--
Wolfgang Viechtbauer

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I have made some functions that I wrote available on the web.  Not a
package, but I know some people have found them useful.

The url is:

http://home.earthlink.net/~bmagill/MyMisc.html


Included, and of special interest to some is prinfact, my function for
principal components factor analysis--updated and now including print and
plot methods.

Also included:

Reliability estimates (alpha) and item total correlations for scale/test
development.
Frequency tables and descriptive statistics
A function to convert covariance matrix to correlation matrix
Several others

Comments and suggestions are appreciated.


Brett.

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Argument 'pch' can also be a vector, e.g.

x <- rnorm(1000)
y <- rnorm(1000)

# pch=".", but every k:th is a "1".
k <- 5
pch <- rep(".", length(x))
pch[seq(1,length(x),by=k)] <- "1"

plot(x,y, type="b", pch=pch)

> -----Original Message-----
> From: owner-r-help at stat.math.ethz.ch 
> [mailto:owner-r-help at stat.math.ethz.ch] On Behalf Of Wolfgang 
> Viechtbauer
> Sent: den 31 oktober 2002 13:42
> To: r-help at stat.math.ethz.ch
> Subject: [R] Changing pch spacing
> 
> 
> Hello R-Helpers,
> 
> plot(x, y, type="b", pch="1")
> 
> plots x vs. y with both a line and the symbol "1" but how do 
> I change the "spacing" of the symbol being plotted. In other 
> words, I don't want to plot the "1" at every data point, but 
> only at every kth point (things get too cluttered when there 
> are many data points). Thanks in advance!
> 
> --
> Wolfgang Viechtbauer
> 
> -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.
> -.-.-.-.-.-.-.-.-
> r-help mailing list -- Read 
> http://www.ci.tuwien.ac.at/~hornik/R/R-> FAQ.html
> Send "info", 
> "help", or "[un]subscribe"
> (in the 
> "body", not the subject !)  To: 
> r-help-request at stat.math.ethz.ch 
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> _._._._._._._._._
> 
> 
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You could try

plot(x, type="o", pch=c(rep(" ", k-1), "1"))

or

plot(x, type="b", pch=c(rep(" ", k-1), "1"))

though neither are probably exactly what you want.


On Wednesday 30 October 2002 08:41 pm, Wolfgang Viechtbauer
wrote:
> Hello R-Helpers,
>
> plot(x, y, type="b", pch="1")
>
> plots x vs. y with both a line and the symbol "1" but how do I
change
> the "spacing" of the symbol being plotted. In other words, I
don't want
> to plot the "1" at every data point, but only at every kth point
(things
> get too cluttered when there are many data points). Thanks in advance!
>
> --
> Wolfgang Viechtbauer
>
> -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
>.-.- r-help mailing list -- Read
> http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info",
"help", or
> "[un]subscribe"
> (in the "body", not the subject !)  To: r-help-request at
stat.math.ethz.ch
> _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
>._._

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