ggplot2 Error: '找不到对象'N'' - 解决方案及排查方法

This error message suggests that R cannot find the object 'N' in your dataset 'dat'.

Possible solutions:

1. Check if 'N' is the correct variable name in your dataset.
2. Make sure that 'dat' is loaded in your workspace.
3. Try specifying the dataset for the 'N' variable in the aes() function, like aes(x = dat$N, y = Yield, color = Hybrid).
4. If the issue persists, provide more information about your dataset and the code you are using to help diagnose the problem.