Insert
par(yaxs="i")
after you are finsihed with the image.
See ?par for details what is does.
Uwe Ligges
On 17.07.2012 13:13, Tiago R M wrote:
Dear Mailing list,
I want to plot a matrix using image() and on its side I want to give
information to every line of the matrix using colors. I tried to use
barplot, but cannot align the two plots. Code below. I succeed in doing
what I want using another image() plot, but was wondering whether there is
an easier way to do it.
Thank you so much!
Tiago
############# code
## matrix to plot
matI <- matrix(c(rep(1:3, 100), rep(4:6, 100), rep(7:9, 100)), nrow=3,
byrow=T)
## plot with three panels
layout(matrix(1:3, nrow=1), widths=c(1,1,1))
# margins
mar1 <- c(1,1,1,1)
par(mar=mar1)
## plot matrix
image(x=(1:(ncol(matI)+1)), y=(1:(nrow(matI)+1)), t(matI), axes=F)
abline(h=c(1,100,200,300), xpd=NA)
## manually adjusting bottom and up par it lines up
## mar1 <- c(1.9,0,1.9,2)
## par(mar=mar1)
colorsBarPlot <- c(rep('green', 100), rep('blue', 100), rep('black', 100))
barplot(rep(1, 300), space=0, border=NA, col=colorsBarPlot, horiz=T, axes=F)
# it works but seems to cumbersome
codeCol <- as.numeric(as.factor(colorsBarPlot))
colsImage <- unique(colorsBarPlot)
colsBreaks <- sort(unique(c(codeCol-0.5, codeCol+0.5)))
image(matrix(codeCol, nrow=1), col=rev(colsImage), breaks=colsBreaks,
axes=F)
######### end of code
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