r - ggplot add extra x axis on string categorical x -


enter image description here

i use ggplot draw above graph. related code here:

p <- ggplot(avg.dice, aes(x=type, y=average)) +     theme_bw() +     geom_point() +     geom_point(aes(x=type, y=cc.average), col="red") +     geom_errorbar(aes(ymin=ci.lower, ymax=ci.upper))

my avg.dice data frame looks this:

      type   average ci.lower  ci.upper cc.average 1      e70 0.6105000    0.525 0.6850000      0.520 2      e89 0.5328000    0.480 0.6100000      0.510 3      f10 0.5902000    0.500 0.6900000      0.490 4      f15 0.4122000    0.365 0.4750000      0.335 5      f20 0.5583000    0.485 0.6200000      0.555 6      f22 0.4332000    0.365 0.4950000      0.325 7      f48 0.3113333    0.200 0.4666667      0.155 8      f80 0.5882000    0.510 0.6900000      0.355 9     i3i8 0.5438000    0.495 0.5900000      0.370 10      m5 0.5986000    0.550 0.6550000      0.485 11 series6 0.5271000    0.470 0.6000000      0.350 12 series7 0.5180000    0.450 0.5850000      0.390 13      x3 0.6190000    0.565 0.6850000      0.645 14   z4e85 0.5340000    0.485 0.6100000      0.505

so x axis automatically show type name in string. how add x axis below current plot can show numeric values related each type? looks graph below:enter image description here

previously used x axis:

fractions = c(0.22,0.14,0.13,0.12,0.117,0.116,0.112, 0.09, 0.07,0.05,0.037,0.014,0.013,0.009) axis(1,at=1:14,labels=fractions,line=4.5,las=2) mtext("document\n fraction\n in cc",side=1,line=5,adj=-0.09)

but won't work in ggplot, telling me "plot.new has not been called yet"


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