Summary statistics for matrix columns
On Nov 24, 2012, at 4:58 AM, frespider wrote:
HI A.k,
I need one more question, if you can answer it please
M <- matrix(sample(1:8000),nrow=100)
colnames(M)<- paste("Col",1:ncol(M),sep="")
apply(M,2,function(x) c(Min=min(x),"1st Qu" =quantile(x,
0.25,names=FALSE),
Range = range(x),
Median = quantile(x, 0.5, names=FALSE),
Mean= mean(x),Std=sd(x),
"3rd Qu" = quantile(x,0.75,names=FALSE),
IQR=IQR(x),Max = max(x)))
why I get two range . isn't range mean the different between the max
and min
If you want the "span" (what you are calling the range) of the range (min and max) you can do this: myRange = diff(range(x))
David > > > David Winsemius, MD Alameda, CA, USA