[R] questions about scatterplotMatrix

[Wendy]

Hi all, 

I want to plot some data with scatterplotMatrix. I want to set all axis
limits of all the sub figures the same, also add abline(0,1) to all the sub
figures. Using the code following code, I can only add abline to the first
off-diagonal figure, and I did not figure out how to set all the axis limits
the same. 


scatterplotMatrix(~ income + education + prestige, smooth =
FALSE,transform=FALSE, data=Duncan,robust=TRUE,diagonal="none",plot.points =
TRUE,reg.line=abline(0,1))

Does anybody know how to achieve this? Any advice is appreciated. Thank you. 

Wendy



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