I'm trying to use multiple plotting colors in my code. My first "ifelse" 
statement successfully does what I want. However, now I want anything less than 
-4.5 to be green and the rest black. I want another "col" argument but can only 
use one. How could I go about getting separate colors for anything above 4.5  
and less than -4.5?

plot(three, type="h", col=ifelse(three > 4.5, "red", "black"), xlim=c(0,500), 
ylim=range(three), lwd=2,
     xlab="Chromosome", ylab="Z-Score", font.lab=2, font=2, main="Upregulated 
Genes in Patient Sample")

Thanks in advance,

Patrick


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