[R] pairs plot

[Ranjan Maitra]

According to the help for pairs, the diag.panel function is supposed to
take a panel.hist as in:

 pairs(USJudgeRatings[1:5], panel = panel.smooth,
           cex = 1.5, pch = 24, bg = "light blue", horOdd=TRUE,
           diag.panel = panel.hist, cex.labels = 2, font.labels = 2)

Error: object 'panel.hist' not found

I know that this used to work in the past so I wonder if this was changed and the documentation was not corrected.
Anyway, what is the current way of doing this?

Many thanks and best wishes,
Ranjan