mat = matrix(rnorm(32), nrow = 4)
f = anno_histogram(mat)
grid.newpage(); f(1:8)
f = anno_histogram(mat, which = "row")
grid.newpage(); f(1:4)
lt = lapply(1:4, function(i) rnorm(8))
f = anno_histogram(lt)
grid.newpage(); f(1:4)
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