Plot in R won't change color

Question

This is probably going to sound like a really stupid question but my plot in R will not change color!

this is my line in R

plot(MasterModCfs$V3,MasterModCfs$V5,col="blue")

I have tried it with spaces and without, with different colors, reloading, everything I could think of. If it's important, MasterModCfs contains literally thousands of data values.

I did one of the examples just to check

cars <- c(1, 3, 6, 4, 9)
plot(cars)
plot(cars, col="blue")

and it's blue. So that works.

Why won't my plot change colors?

Is your first plot otherwise ok, just in black instead of blue? — DatamineR, Jul 30 '14 at 01:13
What is `class(MasterModCfs$V3)`? Are you only drawing to screen? Can you provide a [reproducible example](http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example)? — MrFlick, Jul 30 '14 at 01:47
Does this work: `par(col="blue"); plot(MasterModCfs$V3,MasterModCfs$V5); box(col="black")`? — Jota, Jul 30 '14 at 02:01
@user3736201 Maybe you do what MrFlick suggested and tell us what `class(MasterModCfs$V3)` returns? — DatamineR, Jul 31 '14 at 22:30

score 2 · Answer 1 · answered Aug 14 '17 at 18:51

2

Googling the same problem, I came across this present page - but subsequently found the source of my own issue through trial and error so posting here in case it helps. My x axis values were set up as factors - when I re-converted them to a normal string using as.character(), I was able to re-apply my own colours finally.

answered Aug 14 '17 at 18:51

GoingMush

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1
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Mine was in POSIXct format and didn't work. Change it to as.Date and it worked. Hope this helps others. – TheSciGuy Apr 18 '19 at 14:58

score 0 · Answer 2 · answered Jul 30 '14 at 03:45

0

Without knowing what your par() settings are and what the classes of your columns, it's impossible to say.

You might try adding 'pch=21, bg="red"' to your plot command and see if that changes anything. It might give you a hint.

answered Jul 30 '14 at 03:45

kendaop

107
2
13

1

this seems more like a comment than an answer (perhaps you don't have enough reputation to comment?) – Ben Bolker Jul 30 '14 at 03:54

score 0 · Answer 3 · edited Jul 21 '18 at 05:35

I suggest using the aes command in ggplot2. You can try

ggplot(data = MasterModCfs) + geom_point (mapping =aes (x=V3, y=V5), color="blue")

That should work!

Using plot directly I am not sure how to do it. I try your simple example (with cars) but it also fails if you add another vector for the "y" axis (as you wish to do in the end). To be honest, I have no idea why it works using only "cars" and the color.

Plot in R won't change color

3 Answers3