Graphical Display of Values' Distribution

Philipp Pagel · 2008-09-17T20:06:18Z

> I therefore wish to examine all values of urban.long[,3] which are > greater than 1. I have tried the following, but receive error > messages each time: > > hist(urban.long[,3]>1) > Error in hist.default(urban.long[, 3]> 1) : 'x' must be numeric > > hist(urban.long[urban.long[,3]>1]) > Error in `[.data.frame`(urban.long, urban.long[, 3]> 1) : > undefined columns selected > > hist(urban.long[urban.long[,3]>1]) > Error in `[.data.frame`(urban.long, urban.long[, 3]> 1) : > undefined columns

Philipp Pagel

Wed, Sep 17, 2008 1:06 PM

Again the probelm is the indeing being wrong. What you wand can be
achieved by this:

hist( urban.long[urban.long[,3]>1, 3] )

So your second approach was almost right but again did not return
column 3 as a vector.

You may also want to have a look at the manual page for the subset()
function which sometimes (or to some people) feels easier than logical
subsetting.

cu
	Philipp

Dr. Philipp Pagel
Lehrstuhl f?r Genomorientierte Bioinformatik
Technische Universit?t M?nchen
Wissenschaftszentrum Weihenstephan
85350 Freising, Germany
http://mips.gsf.de/staff/pagel

Graphical Display of Values' Distribution

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