在图例中对齐符号 [英] Align symbols in the legend

问题描述

我想在我的情节中插入一个legant.我用以下代码尝试了此操作:

I woult like to insert a legent to my plot. I tried this with the following code:

plot(1:4)
legend("topleft",legend=expression(paste(theta[1]==7%*%10^-4,sep="  ",theta[2]==-14%*%10^-4),
                                  paste(theta[1]==0,sep="  ",theta[2]==0)),bty="n",cex=1.2)

不幸的是，如您所见，图例的符号在垂直语义中并没有对齐.因此，第二行中的theta_2出现在第一行中theta_1的值下方.

Unfortunately, as you can see, the symbols of the legend are not not aligned in the vertical sence. So theta_2 in the second line appears under the value of theta_1 of the first line.

如何更改代码，以使符号对齐?

How can I change the code, so that the symbols are well aligned?

推荐答案

有一个ncol自变量....

plot(1:4)
legend("topleft",legend= expression( paste(theta[1]==7%*%10^-4) ,
  paste(theta[1]==0)  ,
  paste( theta[2]==-14%*%10^-4),
  paste( theta[2]==0 ) ),
  bty="n",cex=1.2 , ncol = 2 )

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