Transparent histograms redux
August 19th, 2010
The other day, I posted an R function that simulates transparency where histograms overlap. In the comments, Alice left this tip:
You could also use transparent colors, which could mean less programming effort:
e.g. col=rgb(0, 1, 0,0.5)) ..the 4th argument is the degree of transparency alpha
*smacks forehead* That’s a lot simpler than my solution. I didn’t know R supported transparency like that. So instead of using the function I wrote, I could have just done something like this:
a=rnorm(1000, 3, 1)
b=rnorm(1000, 6, 1)
hist(a, xlim=c(0,10), col="red")
hist(b, add=T, col=rgb(0, 1, 0, 0.5)
And gotten the following output:
Much simpler.
Tags: programming, R | Comments Off