Remove margin inside plot pf ggplot2

Question

this is my script and the associated plot:

    library(ggplot2)
    library(reshape)
    df <- structure(list(ID = structure(1:19, .Label = c("2818/22/0834", 
   "2818/22/0851", "2818/22/0853", "2818/22/0886", "B0F", "B12T", 
    "B1T", "B21T", "B22F", "B26T", "B33F", "B4F", "P1", "P21", "P24", 
    "P25", "P27", "P28", "P29"), class = "factor"), K = c(0.089, 
    0.094, 0.096, 0.274, 0.09, 0.312, 0.33, 0.178, 0.05, 0.154, 0.083, 
    0.098, 0.035, 0.084, 0.053, 0.061, 0.043, 0.094, 0.101), Na = c(2.606, 
    3.822, 4.977, 2.522, 15.835, 83.108, 52.041, 41.448, 11.849, 
    40.531, 5.854, 10.151, 3.52, 8.445, 5.273, 7.246, 6.177, 14.813, 
    15.569), Cl = c(3.546, 6.181, 8.422, 3.733, 14.685, 96.911, 65.518, 
    79.01, 10.349, 53.361, 6.12, 10.832, 2.313, 10.312, 5.641, 8.708, 
    6.138, 12.302, 20.078), Mg = c(1.487, 1.773, 1.992, 1.143, 2.991, 
    1.678, 2.23, 3.288, 1.148, 2.428, 3.428, 2.729, 0.777, 2.554, 
    2.374, 4.075, 1.993, 1.881, 3.034), Ca = c(5.529, 6.205, 6.59, 
    4.099, 10.631, 4.564, 6.652, 13.374, 4.332, 10.542, 11.194, 10.053, 
    2.969, 7.73, 8.163, 11.539, 6.166, 5.968, 9.299), SO4 = c(0.663, 
    0.831, 0.607, 0.882, 9.013, 0.896, 0.652, 0.021, 1.446, 0.012, 
    8.832, 6.665, 1.003, 2.575, 3.685, 7.121, 3.64, 5.648, 2.397), 
        HCO3 = c(7.522, 5.498, 6.15, 5.242, 8.582, 4.067, 5.65, 9.364, 
        5.435, 8.068, 9.054, 8.326, 4.805, 7.235, 7.488, 9.234, 6.352, 
        6.98, 8.34)), .Names = c("ID", "K", "Na", "Cl", "Mg", "Ca", 
    "SO4", "HCO3"), class = "data.frame", row.names = c(NA, -19L))

    df_melted<-melt(df, na.rm=T)

    ggplot(df_melted, aes(variable, value, group=ID, color=ID))+
      geom_point(size=2) +
      geom_line() +
      theme(legend.position="none") +
      scale_y_log10(breaks=seq(0, 100, 10))

Is there a way to remove the spaces at the beginning and at the end of the plot? I tried with xlim but the problem is that the x variable is not a numerical variable, so, something like xlim(c("K", "HCO3")) doesn't work. enter image description here

SlowLearner · Accepted Answer · 2013-09-10 11:59:09Z

7

This is a discrete scale, but you can still used the expand argument as follows. Whether the output looks acceptable or not is another matter. Play with the c(0,0) values until you find something that suits. Using 0.1 for the second value gives a slightly better plot, in my view...

ggplot(df_melted, aes(variable, value, group=ID, color=ID))+
      geom_point(size=2) +
      geom_line() +
      theme(legend.position="none") +
      scale_y_log10(breaks=seq(0, 100, 10)) +
        scale_x_discrete(expand = c(0,0))

screenshot

edited Sep 10, 2013 at 11:59

answered Sep 10, 2013 at 11:49

SlowLearner

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1 Comment

Garini Over a year ago

Thanks. For who is asking like myself how to do the same with the y-axis, I used the obvious scale_y_discrete(expand = c(0,0)) and it worked fine.

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