CODEWITHSUNDEEP
rggplot2
matteo
matteo

Reputation: 4873

Remove margin inside plot pf ggplot2

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

Upvotes: 5

Views: 4382

Answers (1)

SlowLearner
SlowLearner

Reputation: 7997

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

Upvotes: 7

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