[R] Attempting to make a custom color spectrum to use inheatmap.2

[Warnes, Gregory R.]

You can assemble a list of colors manually to do what you want.
Something like:

col = c("grey", "black", rainbow(50) )

ought to do the trick.


-G

> Hello there! I'd just like to say in advance, "Thank you," for any
help and/or 
> advice.
>
> My problem is as follows:
>
> I have a dataset that is made up of percentages. I've assigned my
"error" 
> percentages a value of '-100', my "non-existent" percentages a value
of '0', 
> and all my other percentages are normal values that range from the
high 60's to 
> 100. I would like to create a heatmap that designates my "error"
values as 
> gray, my "non-existent" values as black, and I would like to to have
the rest 
> of my values, say 50 to 100, as a rainbow-type spectrum (like the
palette 
> "Spectral" in RColorBrewer, except with 50 values).
>
> I've tried using breaks, and then implementing the breaks in my
heatmap.2 
> command. The breaks work just fine. I guess what I want to control is
the range 
> of the:
>
> col=(colorpanel(#, low="color1", mid="color2", high="color3"))
>
> command. Is there any way to set more values than "low," "mid," and
"high?" If 
> that is possible I think it would solve my problem. I've looked over
the 
> documentation and searched over previous color/heatmap-related
questions, but 
> haven't come across anything that points me in the right direction.
>
> Please let me know if any of what I said needs clarifying before you
can give 
> me what you feel is an appropriate response. Thanks again for your
time.
>
> Regards,
>
> Daniel
>
> ______________________________________________
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>

Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle

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