quarter circles ggplot-s with nonexisting points

I try to use ggplot to plot quarted circles to visualize contour plots but I get misconfigured plot using geom_area (following this tutorial on stacked area with ggplot2) The code I tried reads library(ggplot2) library(dplyr) N <- 1E2 r <- rev(c(1,2,4,7)) maxXY = max(r)+.25*max(r) grupp <- c(“0″,”0.25″,”0.5″,”0.75”) datalist = list() plot(0,0,xlim=c(0,maxXY),ylim=c(0,maxXY)) for (i in 1:length(r))…

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