是否可以删除与某些因子水平相对应的图例元素？
在我的示例中,我希望删除灰色因子级别(1-5)的图例条目,并且仅保持级别"最佳","建议"和"最差".
我已经尝试了很多黑客,但是他们中的大多数已经删除了条形图的灰色(每组25个)或者只留下了我用红色,黄色和绿色着色的条形图.
# ggplot2
barplot <- ggplot(training_results.barplot, mapping=aes(x=name, fill=factor(a))) # filling based on a column ##mapping=aes(x=name, fill=factor(a))
barplot <- barplot + geom_histogram(stat = "identity", aes(name,wer)) ##colour="black"
barplot <- barplot + scale_fill_manual(values=c("#555555", "#777777", "#555555", "#777777", "#555555", color.best, color.suggested, color.worst), labels=c(NA,NA,NA,NA,NA,"Best","Suggested","Worst")) # 6th = best; 7th = suggested; 8th = worst
barplot <- barplot + everyNthLabel(training_results$name,5) # only show every 5th label on x-axis
barplot <- barplot + theme_minimal()
barplot <- barplot + theme(axis.text.x = element_text(angle = 90, hjust = 1, …