I normally use these linebreaks to get sensible indentation.

 matrix(data=c(
               1, 2, 3,
               4, 5, 6,
               7, 8, 9),
        byrow=TRUE,
        nrow=3)

Similarly for list()

xy <- data.frame(x=1:3, y=3:5)
abcd <- xyplot(y ~ x, data=xy,
               scales=list(
                 x=list(at=0:6),
                 y=list(at=0:6)))
Rich

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