r - using fun.y in ggplot -

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i absolute beginner. so, apologize asking basic question. trying plot minimum value in dataset. looked @ following page (changing y scale when using fun.y ggplot) , didn't find solution.

here's first code: works well. plotsa red dot @ mean.

ggplot(mpg, aes(trans, cty)) +   geom_point() +   stat_summary(geom = "point", fun.y = "mean", colour = "red", size = 4)

this 1 doesn't work. can please me? 

ggplot(mpg, aes(trans, cty)) +   geom_point() +   stat_summary(geom = "point", fun.ymin = min, colour = "red", size = 50)

i not sure what's going on.

in stat_summary, plot depends on geom choose. seem want plot points, chose geom = 'point'. point has single y value, fun.y used summary.

there other arguments, fun.ymin , fun.ymax. isn't super clear in documentation, needed if using geoms take additional aesthetics. example, geom = 'pointrange' plots point , vertical bar ymin , ymax:

ggplot(mpg, aes(trans, cty)) +   geom_point() +   stat_summary(geom = 'pointrange', fun.ymin = min, fun.ymax = max, fun.y = mean, colour = "red", size = 1)

in case, ggplot coded in adaptable way can pass name of function character string, fun.ymin = 'min', or can pass function directly, fun.ymin = min.


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