r - Why does ordering by factor destroy the decimal places -


i try simple ggplot of dataframe

  structure(list(clevel = c(3, 4, 5, 6, 7, 8, 9, 10, 11),   sensitivity = structure(c(1l, 2l, 3l, 3l, 5l, 5l, 7l, 8l, 9l),  .label = c("56.6666666666667","53.125", "52.9411764705882", "52.9411764705882",  "54.2857142857143", "54.2857142857143", "55.5555555555556", "56.7567567567568",  "57.1428571428571"), class = "factor"),  specificity = c(76.4705882352941, 76.4705882352941, 76.4705882352941, 76.4705882352941,  76.4705882352941, 76.4705882352941, 76.4705882352941,  76.4705882352941, 76.4705882352941)),   .names = c("clevel", "sensitivity", "specificity"), row.names = c(na, -9l),  class ="data.frame")

when plot follows

library(ggplot2) ggplot() +    geom_point(aes(clevel, sensitivity, color = "red",size=12), st) +     geom_point(shape=5)

i x axis not ordered way want.

so tried

st$sensitivity <- factor(st$sensitivity, levels = st$sensitivity[order(st$clevel)])

but error

in `levels<-`(`*tmp*`, value = if (nl == nl) as.character(labels) else paste0(labels,  : duplicated levels in factors deprecated

so looked @ data frame again , looks though there duplicates in sensitivity column because decimal point has been stripped off of numbers same. want order x axis seems unnecessarily complicated. how can this?

if change sensitivity double, resulting plot looks appropriate:

st <- structure(list(clevel = c(3, 4, 5, 6, 7, 8, 9, 10, 11),                 sensitivity = c(56.6666666666667, 53.125, 52.9411764705882,                  52.9411764705882, 54.2857142857143, 54.2857142857143,                  55.5555555555556, 56.7567567567568, 57.1428571428571 ),                 specificity = c(76.4705882352941, 76.4705882352941,                  76.4705882352941, 76.4705882352941, 76.4705882352941,                  76.4705882352941, 76.4705882352941, 76.4705882352941,                  76.4705882352941)),            .names = c("clevel", "sensitivity", "specificity"),           row.names = c(na, -9l), class = "data.frame")    library(ggplot2) ggplot() +    geom_point(aes(clevel, sensitivity, color = "red",size=12), st) +     geom_point(shape=5)

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