Plot with conditional colors based on values in R

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I want to plot a graph with different colors based on values. I wrote the below code, 

np_graph <- data.frame(C1 = -5:5, C2 = -5:5)
x=np_graph2$C1
y=np_graph2$C2
plot(x,y,xlab="PC1",ylab="PC2")

Now, if the value of X is >0, then that value should be in green (in the graph). if the value of Y is >0, then that value should be in red (in the graph).

Can some one help me in this?

ggplot2 plot r colors
2 Answers

Alternatively, in ggplot2, you can set a new column "Color" based on the ifelse statement and then use scale_color_identity to apply those color on the graph:

np_graph %>% mutate(Color = ifelse(C1 > 0, "green", "red")) %>%
  ggplot(aes(x = C1, y= C2, color = Color))+
  geom_point()+
  scale_color_identity()

enter image description here

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