How to break an axis?
Bo Peng wrote:
Dear list, I need to plot four almost horizontal lines with y-values around 1,3,4, 400. If I plot them directly, the first three lines will be indiscernible so I am thinking of breaking y-axis into two parts, one with range (0,5), another (395,400). Is there an easy way to do this? I can think of two ways: 1. use two plots and draw axes manually. The plot margins, are however difficult to adjust. 2. use one plot, adjust y-values of the lines and draw y-axis manually. But, how would I break y-axis and add separation symbols *on* yaxis? (By separation symbol, I mean something like ------//------ Many thanks in davance. Bo
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maybe something like
matplot(1:10, rep(1,10)%o%c(1,3,4), col=1:3, ylim = c(0,20), type='b')
par(new=T)
matplot(1:10, rep(400,10),axes=F,ann=F, col=4, ylim = c(0,400),type='b')
axis(4)
legend(par('usr')[2], par('usr')[4], bg='white', xjust=1, c('left
axis', 'left axis', 'left axis', 'right axis'),col=1:4,
pch=as.character(1:4))
solves your problem (double y-axis instead of splitting the axis).
joerg