geom_tile和scale_colour_distiller

Question

我想使用geom_tile()创建关联图。这是一个可重现的代码块：

library(ggplot2)

df.m <- structure(list(Trait = structure(c(6L, 5L, 1L, 3L, 2L, 9L, 4L, 
10L, 11L, 7L, 8L, 6L, 5L, 1L, 3L, 2L, 9L, 4L, 10L, 11L, 7L, 8L, 
6L, 5L, 1L, 3L, 2L, 9L, 4L, 10L, 11L, 7L, 8L), .Label = c("R1", 
"R2", "R3", "R4", "R5", 
"R6", "R7", "R8", 
"R9", "R10", 
"R11"), class = "factor"), Variable = structure(c(3L, 
3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 2L, 2L, 2L, 2L, 2L, 2L, 
2L, 2L, 2L, 2L, 2L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L
), .Label = c("C1", "C2", "C3"), class = "factor"), 
    value = c(0.967444360256195, 0.937379062175751, 0.647411823272705, 
    0.512605130672455, 0.50750744342804, 0.508640229701996, 0.508640229701996, 
    0.503542542457581, 0.442936152219772, 0.510905921459198, 
    0.504675328731537, NA, 0.834005177021027, 0.667642116546631, 
    0.579914391040802, 0.579344689846039, 0.536050498485565, 
    0.532062888145447, 0.52408766746521, 0.520099997520447, 0.504719197750092, 
    0.450031787157059, NA, NA, 0.571457028388977, 0.451690584421158, 
    0.354736804962158, 0.46138596534729, 0.477354824542999, 0.447128057479858, 
    0.287439465522766, 0.498456537723541, 0.508722245693207)), .Names = c("Trait", 
"Variable", "value"), row.names = c(NA, -33L), class = "data.frame")

p <- ggplot(na.omit(df.m)) + aes(x = Variable, y = Trait, fill = value) +        
        geom_tile(colour = "white", size = 0.75) +     
            scale_colour_distiller(limits = c(-1, 1), direction = -1, palette = "RdBu", name = "Coefficient") +
            scale_size(range = c(0,20), name = title, guide = "none") +
        geom_text(data = df.m, aes(x = Variable, y = Trait, label = sprintf("%.2f", value)), size = 4, inherit.aes = FALSE) +

        theme(plot.title = element_text(size = 20), axis.text.y = element_text(size = 10), 
                axis.text.x = element_text(size = 10, angle = 90,   hjust = 1, vjust = 0.5), 
                legend.position = "bottom", legend.margin = unit(1.0, "cm"), 
                legend.text = element_text(size = 8), legend.title = element_text(size = 10), 
                legend.key.size = unit(1.0, "cm"),
          panel.background = element_rect(fill = "white")) +

        xlab("\nVariables 1") + ylab("Variables 2\n")

plot(p)

然而，瓷砖填充了自己的颜色梯度刻度，而不是由scale_colour_distiller()定义的颜色。此外，两个关键的传说都出现在情节中：

我只想根据scale_colour_distiller()定义的渐变对瓷砖进行着色。我怎样才能做到这一点？从哪里geom_plot()吮吸色标？

提前致谢！

Answer 1

您需要使用scale_fill_distiller，因为您要将value映射到fill美学而不是color美学。