R help - Jan 2010 - Patterns in histogram

I?ve been busy making some histograms and I would like to distinguish
different groups. I?ve been doing it like this: 

a <- c(1,1,1,1,2,2,2)
hist(a,breaks=c(0,1,2))
hist(a[3:5],breaks=c(0,1,2),col="red",add=TRUE)

Basically plotting them over each other, I assume there is a better
way?Anyway what I want to do is make them in grayscale which essentially
means giving different groups patterns. I?ve been playing around with
?density? and ?angle?

a <- c(1,1,1,1,2,2,2)
hist(a,breaks=c(0,1,2))
hist(a[3:5],breaks=c(0,1,2),add=TRUE,,density=3,angle=9)

Although you can make many different combinations with these I wondered if
there are ?patterns? (dots for example) available in the similar fashion as
the colors (col="red" or pattern="dots")

cheers,

Dennis
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On Jan 7, 2010, at 10:42 AM, dbeest wrote:
>
> I?ve been busy making some histograms and I would like to distinguish
> different groups. I?ve been doing it like this:
>
> a <- c(1,1,1,1,2,2,2)
> hist(a,breaks=c(0,1,2))
> hist(a[3:5],breaks=c(0,1,2),col="red",add=TRUE)
>
> Basically plotting them over each other, I assume there is a better
> way?Anyway what I want to do is make them in grayscale which  
> essentially
> means giving different groups patterns. I?ve been playing around with
> ?density? and ?angle?
>
> a <- c(1,1,1,1,2,2,2)
> hist(a,breaks=c(0,1,2))
> hist(a[3:5],breaks=c(0,1,2),add=TRUE,,density=3,angle=9)
>
> Although you can make many different combinations with these I  
> wondered if
> there are ?patterns? (dots for example) available in the similar  
> fashion as
> the colors (col="red" or pattern="dots")
I have not been able t find such. But you can also get the shading  
lines to respond to lty and to a very limited extent to lwd, ...  at  
least I was not able to get arbitrarily thick lines on my screen  
graphics device (Quartz). The help pages I looked at suggested that  
different graphics devices might have varying parameters that could be  
fiddled with.

--

David Winsemius, MD
Heritage Laboratories
West Hartford, CT