r - stat_summary_hex coloured by ratio -

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let's have data frame following columns: x, y, num, denom, , produce hex plot colours of hexagons set sum(num)/sum(denom).

i assumed answer involve stat_summary_hex naively tried:

ggplot(data, aes(x=x, y=y)) + stat_summary_hex(fun=function(d) {sum(d$num)/sum(d$denom) })

but output is:

error: stat_summaryhex requires following missing aesthetics: z

and understand why (i didn't give z aesthetic), i'm not sure try next: how can pass in 2 z aesthetics (i.e. num , denom)?

i ended finding hack wanted, record here:

ggplot(data, aes(x=x,y=y,z=complex(0,num,denom))) +    stat_summary_hex(fun= function(x) { sum(re(x)) / sum(im(x)) })

essentially, did provide z parameter, column of complex numbers. complex numbers numbers, ggplot lets them through, , have 2 parts, real , imaginary part, aggregation function able compute ratio wanted.


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