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[英]Changing the shape of one point or few points in a scatter plot in R based off of character values
[英]Changing the shape of one point or few points in a scatter plot in R
我在散点图 plot 中有一组点,如下所示。 我想改变一点或几个点的形状。 我搜索了这个,但找不到办法。
我想实现这样
像这样
代码:
df <- data.frame(x = c(1,2,2,3,3.5,4,4.5,5,5.5,6,1.5,2,2,2,2,1.5,2.5,3,3,3,3,5.5,5,6,5.5,7)
,y = c(2,1,2,2,2,2,2,2,1.5,2,2.5,3,3.5,4,4.5,3.5,3.5,2,3,3.5,4,2.5,3,3,4,3.5))
library(ggplot2)
library(extrafont)
# helper dataframe for axis
df_arrow <- data.frame(x = c(0, 0),
y = c(0, 0),
xend = c(0, 8),
yend = c(8, 0))
ggplot(df,aes(x, y)) +
geom_point(colour = "blue", size = 5, shape = 3)+
scale_x_continuous(breaks = 1:7, expand = expansion(add = c(0, 1)))+
scale_y_continuous(breaks = 1:7, expand = expansion(add = c(0, 1)))+
coord_fixed(xlim = c(0, 7), ylim = c(0, 7), clip = "off")+
geom_segment(data = df_arrow, aes(x = x, xend = xend, y = y, yend = yend), size = 0.75, colour = "black",
arrow = arrow(angle = 20, length = unit(3, "mm"), ends = "last", type = "closed"), linejoin = "mitre") +
annotate("text", x = c(7.8, 0.3), y = c(0.3, 7.8), label = c("italic(x)", "italic(y)"), parse = TRUE, size = 6, family = "Times New Roman")+
labs(x = NULL,
y = NULL)+
theme_bw()+
theme(panel.grid.major = element_line(colour = "gray80"),
panel.grid.minor = element_blank(),
panel.border = element_blank(),
axis.ticks.length = unit(1, "mm"),
text = element_text(size = 18, family = "Times New Roman"))
这怎么样?
使用dplyr::mutate
创建一个新列,它以 x 坐标为条件(例如,但它可以是任何东西)。 然后,使用aes
中的此列来控制形状大小。
此外,您可以使用scale_shape_manual
和scale_colour_manual
手动控制形状和颜色。 我不清楚您想要什么形状,但您只需要更改 scale_shape_manual 中的scale_shape_manual
。
编辑:
由于您特别需要不同的符号,因此您需要使用geom_text
代替。
df %>%
dplyr::mutate(z = ifelse(x >= 5, "-", "+")) %>%
ggplot(aes(x, y)) +
geom_text(size = 12, aes(colour=z, label=z)) +
scale_x_continuous(breaks = 1:7, expand = expansion(add = c(0, 1)))+
scale_y_continuous(breaks = 1:7, expand = expansion(add = c(0, 1)))+
coord_fixed(xlim = c(0, 7), ylim = c(0, 7), clip = "off")+
geom_segment(data = df_arrow, aes(x = x, xend = xend, y = y, yend = yend), size = 0.75, colour = "black",
arrow = arrow(angle = 20, length = unit(3, "mm"), ends = "last", type = "closed"), linejoin = "mitre") +
annotate("text", x = c(7.8, 0.3), y = c(0.3, 7.8), label = c("italic(x)", "italic(y)"), parse = TRUE, size = 6, family = "Times New Roman")+
labs(x = NULL,
y = NULL)+
theme_bw()+
theme(panel.grid.major = element_line(colour = "gray80"),
panel.grid.minor = element_blank(),
panel.border = element_blank(),
axis.ticks.length = unit(1, "mm"),
text = element_text(size = 18, family = "Times New Roman")) +
scale_shape_manual(values=c(8, 9)) +
scale_colour_manual(values = c('red', 'blue'))
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