plot - How to merge column labels in barplot in R (a stacked barplot)? -


my data in r this:

    1-12 1-12 1-15 1-15 1-20 1-20 2-6 2-6 3-1-1 3-1-1 3-1 3-1 3-2 3-2 3-3 3-3 n    0    0   14    0   17    0   9   0    27     0   9   0  13   0  33   0 p    0    0    0   12    0   12   0   5     0    13   0   6   0   0   0   9 f    0    0    0    0    0    0   0   2     0    14   0   0   0   6   0  20

by dput(data) result in r is:

    structure(c(0l, 0l, 0l, 0l, 0l, 0l, 14l, 0l, 0l, 0l, 12l, 0l,  17l, 0l, 0l, 0l, 12l, 0l, 9l, 0l, 0l, 0l, 5l, 2l, 27l, 0l, 0l,  0l, 13l, 14l, 9l, 0l, 0l, 0l, 6l, 0l, 13l, 0l, 0l, 0l, 0l, 6l,  33l, 0l, 0l, 0l, 9l, 20l), .dim = c(3l, 16l), .dimnames = list( c("n", "p", "f"), c("1-12", "1-12", "1-15", "1-15", "1-20",  "1-20", "2-6", "2-6", "3-1-1", "3-1-1", "3-1", "3-1", "3-2",  "3-2", "3-3", "3-3")))

and code is:

barplot(data,space=c(1,0.25),legend=rownames(data),col=c('white','black','grey'),las=2)

it looks normal bar plot, each column has label @ bottom...

but, there many labels in x-axis, , want merge names of 2 columns one(since have same name), i.e, in middle of first 2 columns, there 1 label "1-12" @ bottom, there 8 labels in total. how can make change?

many thanks!

if wish have centred labels under each group, like:

# suppress x-axis , save original plot's bar locations bp <- barplot(data,space=c(1,0.25),legend=rownames(data),              col=c('white','black','grey'),las=2,              xaxt="n")  # draw new axis using these values axis(1,at=rowmeans(matrix(bp,ncol=2,byrow=true)),      labels=unique(colnames(data)),lty=0)

enter image description here

ignoring overlapping legend of course... can fixed placing better using legend.args in original barplot call


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