我想在函數裏面使用ggplot
,但是我無法產生 這個圖。具體而言,我想確定圖 將從函數調用中使用facet_grid()
。這是我的數據:函數裏面不能使用ggplot分面
mydf <- data.frame(
group = rep(c("g1", "g2"), each = 16, times = 1),
cluster = rep(c("c1", "c2"), each = 8, times = 2),
score1 = c(rnorm(n = 16, mean = 10, sd = 10), rnorm(n = 16, mean = 18, sd = 10)),
score2 = c(rnorm(n = 16, mean = 50, sd = 10), rnorm(n = 16, mean = 33, sd = 10))
)
下面是函數:
myFunc <- function(data, group = NULL, group2, var1, var2) {
# So we don't need quotation marks in function call
arguments <- as.list(match.call())
var1 = eval(arguments$var1, data)
var2 = eval(arguments$var2, data)
group2 = eval(arguments$cluster, data)
grouping = eval(arguments$group, data)
# Make this graph if no faceting needed
if (length(grouping) == 0) {
means <- aggregate(cbind(var1, var2) ~ group2, FUN = mean, data = data)
ggplot(data, aes(x = var1, y = var2, color = group2, label = group2)) +
stat_ellipse(type = "norm", show.legend = FALSE, geom = "polygon", alpha = 0.1) +
geom_text(alpha = 0.5, show.legend = FALSE) +
geom_text(data = means, aes(x = var1, y = var2, color = group2))
# Use faceting
} else if (length(grouping) > 0) {
means <- aggregate(cbind(var1, var2) ~ grouping + group2, FUN = mean, data = data)
# Plot
ggplot(data, aes(x = var1, y = var2, color = group2, label = group2)) +
stat_ellipse(type = "norm", show.legend = FALSE, geom = "polygon", alpha = 0.1) +
geom_text(alpha = 0.5, show.legend = FALSE) +
geom_text(data = means, aes(x = var1, y = var2, color = group2)) +
facet_grid(. ~ grouping)
}
}
我打電話,像這樣的功能:
myFunc(data = mydf, group = NULL, group2 = cluster, var1 = score1, var2 = score2)
myFunc(data = mydf, group = group, group2 = cluster, var1 = score1, var2 = score2)
兩個調用提供以下錯誤分別是:
# Error 1
Error: Aesthetics must be either length 1 or the same as the data (32): x, y, colour, label
# Error 2
Error in combine_vars(data, params$plot_env, cols, drop = params$drop) :
At least one layer must contain all variables used for facetting
預計d輸出可以通過手動構建的曲線來獲得:
means <- aggregate(cbind(score1, score2) ~ group + cluster, FUN = mean, data = mydf)
# without facet
ggplot(mydf, aes(x = score1, y = score2, color = cluster, label = cluster)) +
stat_ellipse(type = "norm", show.legend = FALSE, geom = "polygon", alpha = 0.1) +
geom_text(alpha = 0.5, show.legend = FALSE) +
geom_text(data = means, aes(x = score1, y = score2, color = cluster))
# with facet
ggplot(mydf, aes(x = score1, y = score2, color = cluster, label = cluster)) +
stat_ellipse(type = "norm", show.legend = FALSE, geom = "polygon", alpha = 0.1) +
geom_text(alpha = 0.5, show.legend = FALSE) +
geom_text(data = means, aes(x = score1, y = score2, color = cluster)) +
facet_grid(. ~ group)