[R] hist{graphics}

[Steven T. Yen]

# Can someone help with this simple frequency histogram problem (n = 15)?
# I use four class limits: [90,95], [95,100], [100,105], [105,110].
# These coincide with the limits obtain by pretty {base}.
# Proper frequencies would be: (1,5,6,3).
# But hist{graphics} gives me a histogram showing frequencies (1,8,3,3),
# with or without argument break = ...
# Replicable codes below. Thanks.

set.seed(123)
x<-rnorm(15,mean=100,sd=5); x<-as.integer(x)
x<-sort(x)
x
breaks<-seq(90,110,by=5); breaks
pretty(x,n=5) # pretty {base}
x.cut<-cut(x,breaks,right=F) ; x.cut
freq<-table(x.cut); cbind(freq)
hist(x,breaks=breaks) # hist {graphics}
hist(x)