[R] Multiple Ploting Colors

[Richardson, Patrick]

Steve,

That worked perfectly.  Thank You!

Best regards,

Patrick


-----Original Message-----
From: Steve Lianoglou [mailto:mailinglist.honeypot at gmail.com] 
Sent: Monday, July 12, 2010 12:55 PM
To: Richardson, Patrick
Cc: r-help at r-project.org
Subject: Re: [R] Multiple Ploting Colors

Hi,

On Mon, Jul 12, 2010 at 12:02 PM, Richardson, Patrick
<Patrick.Richardson at vai.org> wrote:
> 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")

How about:

my.colors <- ifelse(three > 4.5, "red", "black")
my.colors[three < -4.5] <- 'green'

plot(three, type='h', col=my.colors, ...)

-- 
Steve Lianoglou
Graduate Student: Computational Systems Biology
 | Memorial Sloan-Kettering Cancer Center
 | Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/~lianos/contact
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