When using “geom_histogram” there is error “unit(tic_pos.c, ”mm“) : 'x' and 'units' must have length > 0”. Why

Question

When using geom_histogram there is error

unit(tic_pos.c, \"mm\") : \'x\' and \'units\' must have length > 0. 

Why?

Answer 1

You got this error because p values are numeric in your data frame but in this case for the fill= you need discrete values as bars are stacked and will be colored according to p. Just use as.factor() around p.

ggplot(BCIcor,aes(x=cor,fill=as.factor(p)))+geom_histogram(binwidth = 0.2)