# NOT RUN {
umx_apply(mean, mtcars, by = "columns")
umx_apply("mean", of = mtcars, by = "columns")
tmp = mtcars[1:3,]; tmp[1,1]=NA
umx_apply("mean", by = "rows", of = tmp)
umx_apply("mean", by = "rows", of = tmp, na.rm = TRUE)
# }
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