http://grokbase.com/p/r/r-help/1169gqdxcs/r-ggplot2-histogram-with-density-curve

# If you want it on the count scale, that is trickier and requires
# knowing (setting) the binwidth and keeping that value in sync in
# two places.
# In this example, the binwidth is 0.2 (set in geom_histogram and also
# used in the aes of geom_density).

ggplot(DF, aes(x=t)) +
geom_histogram(fill="blue", colour="black", binwidth=0.2) +
geom_density(aes(y=0.2*..count..), colour="black", adjust=4) +
opts(title="Normal Random Sample")


How is the above accomplished with a variable binwidth?  I.e. if I set my binwidth to a variable 'H' and use 'H' in place of '0.2' above why do I receive an error saying "Error in eval(expr, envir, enclos) : object 'H' not found"





Jacob Trochelman
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Services Engineering
GE Aviation

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