在 plot.zoo 中旋转 y 轴 TEXT 标签

Question

I would like to rotate the labelling of the y-labs to horizontal and can't find an answer without ggplot.

Is there a way to rotate them in plot.zoo?

The labels I mean are those ones called Series 1:5 and I have outlined them in red.

data <- xts(matrix(rnorm(1000), ncol = 5), order.by = as.Date(1:200))
plot.zoo(data)

Answer 1

Use las=1 like this:

plot.zoo(data, las = 1)

Update

The question later clarified that it was referring to the ylab. plot.zoo uses mtext for that and hard codes it; however, we could hack it using trace :

library(xts)

trace(plot.zoo, 
  quote(mtext <- function(...) graphics::mtext(..., cex = 0.7, las = 1)))
plot.zoo(data, oma = c(6, 5, 5, 0))
untrace(plot.zoo)