r - How to use facet_grid correctly in ggplot2? -


i'm trying generate 1 chart per profile following code, keep getting "at least 1 layer must contain variables used facetting." errors. spent last few hours trying make work couldn't.

i believe anwser must simple, can help?

d = structure(list(category = structure(c(2l, 2l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 3l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l,  1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 3l, 3l, 3l, 3l,  3l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 2l, 2l, 2l), .label = c("4x4",  "hatch", "sedan"), class = "factor"), profile = structure(c(1l,  1l, 1l, 1l, 3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l,  3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l, 3l,  3l, 3l, 3l, 3l, 3l, 3l, 3l, 2l, 2l, 2l, 2l, 2l, 2l, 2l, 1l, 1l,  1l), .label = c("fixed", "free", "mobile"), class = "factor"),      value = c(6440.32, 6287.22, 9324, 7532, 7287.63, 6827.27,      6880.48, 7795.15, 7042.51, 2708.41, 1373.69, 6742.87, 7692.65,      7692.65, 8116.56, 7692.65, 7692.65, 7692.65, 7962.65, 8116.56,      5691.12, 2434, 8343, 7727.73, 7692.65, 7721.15, 1944.38,      6044.23, 8633.65, 7692.65, 7692.65, 8151.65, 7692.65, 7692.65,      2708.41, 3271.45, 3333.82, 1257.48, 6223.13, 7692.65, 6955.46,      7115.46, 7115.46, 7115.46, 7115.46, 6955.46, 7615.46, 2621.21,      2621.21, 445.61)), .names = c("category", "profile", "value" ), class = "data.frame", row.names = c(na, -50l))  library(ggplot2)  p = ggplot(d, aes(x=d$value, fill=d$category)) + geom_density(alpha=.3) p + facet_grid(d$profile ~ .)

your problem comes referring variables explicitly (i.e. d$profile), not respect data argument in call ggplot. there no need d$ anywhere.

when faceting using facet_grid or facet_wrap, need so. practice in calls aes

p = ggplot(d, aes(x=value, fill=category)) + geom_density(alpha=.3) p + facet_grid(profile ~ .)

enter image description here


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