使用ggsave时遇到“错误：$运算符对原子向量无效”

编程问答 2022-04-22

问题描述

这是我准备的代码作为示例。一切都很好，直到我运行 ggsave。错误是关于 $ 运算符，这很令人困惑。我见过很多人在不同情况下都有类似的错误信息。是我的错还是内部 R 错误？

library(tidyverse)

xx <- seq(0,2,0.01); yy <- seq(0,0.02); zz <- seq(0,0.04)

dat <- data.frame(
  times = c(xx,yy,zz),val = c(sin(xx),sin(yy)+rnorm(length(yy),sd=0.2),sin(zz)+rnorm(length(zz),sd=0.3)),method = c(rep("A",length(xx)),rep("B",length(yy)),rep("C",length(zz)))
)

fig <- ggplot(dat) +
  geom_line(aes(x = times,y = val,col = method,linetype = method)) + 
  theme_minimal() +
  scale_color_manual(values = c("#29BDCE","#ED8534","#625559")) +
  scale_linetype_manual(values=c("solid","longdash","dashed")) +
  theme(legend.title = element_blank(),legend.position = "none") 

ggsave(fig,"D:/ResearchesAndProjects/2021_2_ODEadditive/code-ode-additive/examples/plots/test.png",device = "png",type ="cairo")
#> Saving 7 x 5 in image
#> Error: $ operator is invalid for atomic vectors
Created on 2021-07-01 by the reprex package (v2.0.0)

解决方法

from ?ggsave 第一个参数是文件名，而第二个参数是绘图。试试 -

ggsave("D:/ResearchesAndProjects/2021_2_ODEadditive/code-ode-additive/examples/plots/test.png",fig,device = "png",type ="cairo")
ggplot2ggsaverr