r - If else in ggplot +在geom_vline的字符和数字之间切换值
问题描述
我需要if else
在 ggplot 中集成块,取决于variable_to_switch
它的值:
- 如果值是数字 -> 绘图线
- 值是文本-> 不绘制线
我以最完整的版本提供我的代码,以考虑与提供的解决方案可能发生的冲突。
# Creating Data ----
obs_number <- 500
mean <- 2
median <- 3
dens_mode <- 2
variable_to_switch <- "Text"
dlt_standard_mean <- 2
cut_off <- 12
max_dlt <- 15
metrics_test <- data.frame(xintercept = c(obs_number,cut_off,max_dlt, 0, mean, median, dens_mode,variable_to_switch, dlt_standard_mean ),
label = c("Label 1",
"Label 2",
"Label 3",
"",
"Label 4",
"Label 5",
"Label 6",
"Label 7",
"Label 8"))
mean_by_batch_route <- c(rep(1,81), rep(2,252), rep(3,170), rep(4,41))
Label <- c(rep('Label',544))
data_to_plot_test <- data.frame(cbind(Label,mean_by_batch_route))
data_to_plot_test$mean_by_batch_route <- as.numeric(data_to_plot_test$mean_by_batch_route)
# Plotting ---
x_data <- 4
histo_density_plot <- ggplot(data_to_plot_test, aes(x = mean_by_batch_route)) +
geom_histogram(aes(y = ..density..), binwidth = 1, colour= "black", fill = "white") +
geom_density(adjust = 1.75, aes(y=..density..), fill="blue", alpha = .25)
if(variable_to_switch == "Text"){
histo_density_plot <- histo_density_plot +
geom_vline(aes(xintercept = xintercept, color = label),
data = metrics_test[c(6,7,9), ], linetype = "dashed", size = 0.5, alpha = 1,
key_glyph = draw_key_text) +
scale_color_manual(
name= "Values",
limits = metrics_test$label,
values = c("navyblue","darkcyan", "cyan4", "white", "black", "chartreuse4", "purple","darkgoldenrod3", "red"),
guide = guide_legend(override.aes = list(label = metrics_test$xintercept,
size = 3)))
} else {
histo_density_plot <- histo_density_plot +
geom_vline(aes(xintercept = xintercept, color = label),
data = metrics_test[6:nrow(metrics_test), ], linetype = "dashed", size = 0.5, alpha = 1,
key_glyph = draw_key_text) +
scale_color_manual(
name= "Values",
limits = metrics_test$label,
values = c("navyblue","darkcyan", "cyan4", "white", "black", "chartreuse4", "purple","darkgoldenrod3", "red"),
guide = guide_legend(override.aes = list(label = metrics_test$xintercept,
size = 3)))
}
histo_density_plot <- histo_density_plot +
theme(plot.title = element_text(hjust = 0.5, size = 8),
axis.title.x = element_text(colour = "darkblue", size=8),
axis.text.x = element_text(face="plain", color="black",
size=8, angle=0),
axis.title.y = element_text(colour = "darkblue", size=8),
axis.text.y = element_text(face="plain", color="black",
size=8, angle=0),
legend.position = c(.80, .70),
legend.title=element_text(size=8),
legend.text = element_text(size = 8)
)+
labs(title = relevant_title, y = "Distribution fors DLT values, frequency", x = "DLT for the route: average DLT per batch, days")+
scale_x_continuous(breaks = seq(0, x_data,
ifelse(x_data <= 20, 1,
ifelse((x_data > 20 & x_data < 50), 5, 10))))
histo_density_plot
如果variable_to_switch == "Text"
我会有这个错误:
Error: Discrete value supplied to continuous scale
。
对于variable_to_switch
等于任何数值绘图的作品。
我想在字符和数值之间切换variable_to_switch
。情况下
所需的输出variable_to_switch == "Text"
:
解决方案
如评论中所述,主要问题是数据框中的xintercept
列metrics_test
包含数字和文本。数据框列只能包含一个变量类型,并且文本不能是数字,因此该列将始终是chr
类型,而不是num
类型。然后,您将此列分配给调用中的xintercept
美学geom_vline()
,这是错误消息的来源。
如果您提供的数据框的子集不包含in 中的文本值metrics_test$xintercept
,则可以通过将列强制为数字类型来解决此问题 - 只要该列不再包含任何文本。在您的示例代码中,如果您将代码的第一部分替换为以下内容,则它可以正常工作而不会出现错误:
# your code prior to the if/then statement...
if(variable_to_switch == "Text"){
d <- metrics_test[c(6,7,9),] # temporary data frame
d$xintercept <- as.numeric(d$xintercept)
histo_density_plot <- histo_density_plot +
geom_vline(aes(xintercept = xintercept, color = label),
data = d, linetype = "dashed", size = 0.5, alpha = 1,
key_glyph = draw_key_text) +
# the rest of the if then statement and code continues as you have it..
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