[R] multiple scatterplots

[Heather Good]

When I create multiple scatterplots on a page using:

> op = par(mfrow=c(2,2))
plot( x, y, xlab="x", ylab="y", main="plot of x and y")
etc.

I am getting plots that are rectangular, not square. Although, the first few times I used this command, it produced square plots. Is there a way to ensure that square plots are created?

Heather

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