Scatter plot with ggplot with different colors

Question

I have my data which is shown as below:

X   Y
1.92    0.79
6.80    0.55
4.53    -2.08
-1.13   -5.69
-5.60   -6.21
2.87    7.34
6.93    1.68

I want to plot a regular scatter plot with different colors for positive points and negative points. How do I do this using ggplot ? Thanks

EDIT: This is what I attempted so far:

dat_input<-read.table("test.txt", header=TRUE)
shoot_input<-gather(dat_input, factor_key = TRUE)
ggplot(dat_input,  aes(x=shoot_input[1:7,2], y= shoot_input[8:14,2], color=key)) + geom_point()

Updated my question. WIth this, I am getting the error: Error in FUN(X[[i]], ...) : object 'key' not found — Bitsy
– Bitsy, Commented Apr 30, 2020 at 13:44
Do you define "negative point" as being negative in X, Y, either, or both? — Gregor Thomas
– Gregor Thomas, Commented Apr 30, 2020 at 13:45
Basically, if I plot these points in the 4 quadrants, the 1st quadrant will have all positives (so all points as Red, so both +ves), 3rd quadrant (both -ves, blue) and the rest can be a default color. — Bitsy
– Bitsy, Commented Apr 30, 2020 at 14:01

Richard Telford · Accepted Answer · 2020-04-30 14:24:48Z

2

You can use dplyr::case_when to make a new column in the data.frame with the information on positive columns

library(tidyverse)

dat_input <- read_table2("X   Y
1.92    0.79
6.80    0.55
4.53    -2.08
-1.13   -5.69
-5.60   -6.21
2.87    7.34
6.93    1.68")

dat_input <- dat_input %>% 
  mutate(positives = case_when(
    X > 0 & Y > 0 ~ "Both positive",
    X < 0 & Y < 0 ~ "Both negative",
    TRUE ~ "One positive"
  ))

ggplot(dat_input, aes(x = X, y = Y, colour = positives)) +
  geom_point()

^{Created on 2020-04-30 by the reprex package (v0.3.0)}

answered Apr 30, 2020 at 14:24

Richard Telford

9,9836 gold badges43 silver badges53 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Scatter plot with ggplot with different colors

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related