Line weight in geom_density plots

[Kevin Stierhoff]

Hi,
I'm trying to adjust the line weight in a geom_density plot. My data are
attached. The code to generate the plot is below.
Thanks,
Kevin

load("lengths.Rdata")
#plot animal lengths by year
l <- ggplot(length.gg, aes(length, colour = year))
l + geom_density() + scale_colour_grey() + labs(colour="Year")
#convert to bw theme
last_plot() + theme_bw()

[Ben Bond-Lamberty]

Kevin, not clear if you want to adjust it by year, or for all the
lines simultaneously:

l <- ggplot(length.gg, aes(length, size = year)) # size of line
based on variable

l + geom_density(size=2) + scale_colour_grey() + labs(colour="Year")
# constant size

Ben

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[Kevin Stierhoff]

Dennis, yes I did mean line thickness. The default thickness was too faint to distinguish the different groups. size = 1 in geom_density did the trick.

Ben, I hadn't thought of plotting the thickness by a particular factor, but thanks for giving me options! I wanted a constant thickness in this case, though.

Thanks for the quick replies!
Kevin

--
Kevin Stierhoff, PhD
Research Fisheries Biologist
NOAA Fisheries Service - Southwest Fisheries Science Center
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