Plot 2 variables on the same axis

Question

I want to plot both y1 and y2 against x.

I don't want to use ggplot2.

Is it possible with just the plot() function? I have tried using par(new = TRUE) but this literally overlays y2 with y1 and it looks messy. I want to color code it for both y1 and y2.

Grateful for any pointers. Thanks

you can add variables with `points()` also you can use the col argument there. Check `?points()` — mischva11, Jul 01 '19 at 13:34
Possible duplicate of [Plot two graphs in same plot in R](https://stackoverflow.com/questions/2564258/plot-two-graphs-in-same-plot-in-r) — AkselA, Jul 01 '19 at 13:41

score 2 · Accepted Answer · answered Jul 01 '19 at 13:37

2

You can add variables with points() also you can use the col argument there. Check ?points() for more information. Here a small example with a costum dataset.

df<-mtcars
plot(df$disp, df$mpg)
points(df$hp, df$mpg, col="green")

Output:

answered Jul 01 '19 at 13:37

mischva11

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This looks like exactly what I need! But how should I add a legend to describe which col relates to which variable? – Henry P. Jul 01 '19 at 13:40
This is such a basic concept in R that it's almost guaranteed to be a duplicate. Please do a search before you answer. – AkselA Jul 01 '19 at 13:43
1

@HenryP. take a look at [this](https://stackoverflow.com/questions/37401702/add-legend-to-a-plot-with-r) or ?legend – mischva11 Jul 01 '19 at 13:47

Plot 2 variables on the same axis

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