r - R图例中多种颜色的有趣行为

Question

我正在添加到情节中的图例中的颜色出现一些有趣的行为。该图很难重现，但可以从下面的示例中重现该行为：

mod3.cor.spo = 10
mod2.cor.spo = 10
mod1.cor.spo = 10
mod1.MBE.spo = 10
mod2.MBE.spo = 10
mod3.MBE.spo = 10
plot(1:10)
legend("bottomleft", 
       c(paste("r = ", sprintf("%1.3g", mod1.cor.spo)," MBE = ", sprintf("%1.3g", mod1.MBE.spo), "%", sep=""), 
                       paste("r = ",sprintf("%1.3g", mod2.cor.spo)," MBE = ", sprintf("%1.3g", mod2.MBE.spo), "%", sep=""), 
                       paste("r = ",sprintf("%1.3g", mod3.cor.spo)," MBE = ", sprintf("%1.3g", mod3.MBE.spo), "%", sep="")), 
       cex=0.6, col=c("red","blue","orange"), bty="n" )

希望如果您尝试此操作，您应该会看到图例中的文本全部打印为黑色。我期望（并希望）发生的是图例（打印成三行）的第一行文本为红色，第二行为蓝色，底部为橙色。

我在这里做错了什么吗？是否归结为使用组合大量字符串？

Answer 1

你必须写text.col=c("red","blue","orange")而不是col=c("red","blue","orange")看?legend