r - non-numeric argument to binary in geom_errorbar -

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i'm trying add error bars histograms (only in bars), i'm having problems , couldn't fix this. sample of dataset:

      dput(subdat)       structure(list(mod = c("mme_rcp85", "mme_picontrol", "mme_rcp85",        "mme_picontrol", "mme_rcp85", "mme_picontrol", "mme_rcp85",   "mme_picontrol",        "mme_rcp85", "mme_picontrol", "mme_rcp85", "mme_picontrol", "mme_rcp85",         "mme_picontrol", "mme_rcp85", "mme_picontrol", "mme_rcp85", "mme_picontrol",        "mme_rcp85", "mme_picontrol", "mme_rcp85", "mme_picontrol"),        id = c(4l, 5l, 4l, 5l, 4l, 5l, 4l, 5l, 4l, 5l, 4l, 5l, 4l,        5l, 4l, 5l, 4l, 5l, 4l, 5l, 4l, 5l), variable = structure(c(1l,        1l, 2l, 2l, 3l, 3l, 4l, 4l, 5l, 5l, 6l, 6l, 7l, 7l, 8l, 8l,        9l, 9l, 10l, 10l, 11l, 11l), .label = c("a", "c", "e", "n",       "ne", "nw", "s", "se", "sw", "u", "w"), class = "factor"),        value = c(23.3739104936128, 20.1308610498121, 18.8255024990622,        19.0964172156593, 5.77035863185792, 5.55522907864065, 7.7881775809746,        6.79307018295126, 4.32731156887715, 3.81988029851766, 7.39932393157495,        6.53369517479574, 7.22600735346051, 7.25113200310887, 3.09683685988686,        3.20062134399185, 5.97626752214253, 5.53675529950584, 5.86005136849718,        4.81357821706405, 10.3562524093597, 9.26876021032058), std = list(       0, 1.1044752690746, 0, 0.985464166294808, 0, 1.28014680316859,        0, 1.26851693389212, 0, 1.31353120434552, 0, 1.04172687591445,        0, 2.37424970962826, 0, 1.27746257356022, 0, 2.46069388335777,        0, 1.31748174778294, 0, 1.64599561125564)), .names = c("mod",        "id", "variable", "value", "std"), row.names = c(4l, 5l, 9l,        10l, 14l, 15l, 19l, 20l, 24l, 25l, 29l, 30l, 34l, 35l, 39l, 40l,        44l, 45l, 49l, 50l, 54l, 55l), class = "data.frame")

i doing plot as:

p  <- ggplot(subdat,aes(variable,value,fill=mod))   p +geom_bar(stat="identity",position='dodge') p +    geom_errorbar(aes(ymin=value-std, ymax=value+std), width=.2,                        position=position_dodge(.9))

i'm getting error:

error in value - std : non-numeric argument binary operator

i don't know how solve this.

you need change class of std:

enter image description here

subdat$sd = as.numeric(subdat$std)  p  <- ggplot(subdat,aes(variable,value,fill=mod))   p <- p + geom_bar(stat="identity",position='dodge') p + geom_errorbar(aes(ymin = value - sd, ymax = value + sd), width = 0.2, position = position_dodge(0.9))

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