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Taka Matzmoto
Thanks to Martin Sandiford,
I can draw a graph using lower diagonal type of data.
One problem I can't solve is to put appropriate tick marks on the graph

##############################################
x<- matrix(NA,50,50)
x[lower.tri(x)] <- runif(choose(50,2),0,1)
plot(1,2,xlim=c(1,50),ylim=c(49,2),xlab="",ylab="",type="n")
par(new=T)
image(1-t(x)[,ncol(x):1], col=gray.colors(100), axes=FALSE)
##############################################

I like ticks on both x-axis and y-axis to be located in the middle of each
cell.
X-axis needs to start with 1 and end with 50.
Y-axis needs to start with 2 and end with 49.

I looked at the help file for "par" and changed some settings but I couldn't
succeed.

Any advice on this issue would be greatly appreciated !!

TM

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