R Under development (unstable) (2023-10-21 r85382 ucrt) -- "Unsuffered Consequences"
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> 
> library(lattice)
> 
> pdf("auto-key.pdf", width = 10, height = 7)
> 
> d <- data.frame(x = rnorm(100),
+                 y = rnorm(100),
+                 a = gl(2, 50),
+                 b = gl(7, 1, 50))
> 
> xyplot(y ~ x | a, data = d, groups = b, type = "p", auto.key = TRUE)
> 
> xyplot(y ~ x | a, data = d, groups = b, type = "l", auto.key = TRUE)
> 
> xyplot(y ~ x | a, data = d, groups = b, type = "o", auto.key = TRUE)
> 
> cloud(y ~ x + a, data = d, groups = b, type = "b", auto.key = TRUE)
> 
> splom(~ data.frame(x, y, z = x + y) | a, data = d, groups = b,
+       type = "b", auto.key = TRUE)
> 
> densityplot(~ x, data = d, groups = b, auto.key = TRUE)
> 
> histogram(~ x, data = d, groups = b, auto.key = TRUE)
> 
> qqmath( ~ x | a, data = d, groups = b, type = "o", auto.key = TRUE)
> 
> barchart(xtabs(x ~ a + b, data = d), auto.key = TRUE)
> 
> ## not-default placements
> 
> xyplot(y ~ x | a, data = d, groups = b, type = "o",
+        auto.key = list(space = "left", columns = 2))
> 
> xyplot(y ~ x | a, data = d, groups = b, type = "o",
+        auto.key = list(columns = 3))
> 
> p1 <- xyplot(y ~ x | a, data = d, groups = b, type = "o",
+              par.settings = simpleTheme(pch = 16))
> p2 <- dotplot(xtabs(x ~ b + a, data = d),
+               par.settings = simpleTheme(pch = 16))
> p3 <- barchart(xtabs(x ~ b + a, data = d),
+                par.settings = simpleTheme(pch = 16))
> 
> p1
> update(p1, auto.key = list(columns = 3))
> 
> p2
> update(p2, auto.key = list(columns = 2))
> 
> p3
> update(p3, auto.key = list(columns = 2))
> 
> dev.off()
null device 
          1 
> 
> 
> proc.time()
   user  system elapsed 
   1.20    0.09    1.28