我有這樣的資料和情節，
x = c(1,2,3,4,5,6,7,8,9,10,11,12)
y1 = x^2-5
y2 = -x^2 1
data <- data.frame(x,y1,y2)
data1 = data.frame(pivot_longer(data,2:3))
ggplot(data1, aes(x, y = value, color = name))
geom_point()
geom_smooth(method = 'lm',se = FALSE)
有沒有辦法讓趨勢線僅適用于大于某個數字（如 3）的 x 值？
uj5u.com熱心網友回復：
你可以這樣做：
ggplot(data1, aes(x, y = value, color = name))
geom_point()
geom_smooth(data=dplyr::filter(data1,x>3), method = 'lm',se = FALSE)
uj5u.com熱心網友回復：
您可以僅將當前應用aes到geom_point，并創建一個新列（即x2在我的代碼中）以映射到geom_smooth.
library(tidyverse)
x = c(1,2,3,4,5,6,7,8,9,10,11,12)
y1 = x^2-5
y2 = -x^2 1
data <- data.frame(x,y1,y2)
data1 = data.frame(pivot_longer(data,2:3))
data1 %>% mutate(x2 = ifelse(x > 3, x, NA)) %>%
ggplot()
geom_point(aes(x, y = value, color = name))
geom_smooth(aes(x2, y = value, color = name), method = 'lm',se = FALSE)
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