[R] How to plot with different colours

2008-11-02 Thread Carlos Morales 
Hello everyone,

I'm trying to plot 3600 points and my idea is if this value is higher than 0.35 
then this point must appear in green colour, if it's smaller than -0.35 then 
values must appear in red and if values are between -0.35 and 0.35 they must be 
in yellow. I'm thinking and I'm trying many things but I don't achieve it. Any 
idea?.

Thanks so much
Carlos Morales Diego




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Re: [R] How to plot with different colours

2008-11-02 Thread Bernardo Rangel Tura 
On Sun, 2008-11-02 at 07:58 +, Carlos Morales wrote:
> Hello everyone,
> 
> I'm trying to plot 3600 points and my idea is if this value is higher than 
> 0.35 then this point must appear in green colour, if it's smaller than -0.35 
> then values must appear in red and if values are between -0.35 and 0.35 they 
> must be in yellow. I'm thinking and I'm trying many things but I don't 
> achieve it. Any idea?.
> 
> Thanks so much
> Carlos Morales Diego

Hi Carlos

I think you need use a nested ifelse, something similar this

x<-runif(6000,-1,1)
color<-ifelse(x>.35,"green",ifelse(x< -.35,"red","yellow"))
table(col)
plot(1:6000,x,col=color)

-- 
Bernardo Rangel Tura, M.D,MPH,Ph.D
National Institute of Cardiology
Brazil

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Re: [R] How to plot with different colours

2008-11-02 Thread Jim Lemon 

Carlos Morales wrote:


Hello everyone,
 
I'm trying to plot 3600 points and my idea is if this value is higher than 0.35 then this point must appear in green colour, if it's smaller than -0.35 then values must appear in red and if values are between -0.35 and 0.35 they must be in yellow. I'm thinking and I'm trying many things but I don't achieve it. Any idea?.

Hi Carlos,
This may be what you want:

zeep<-rnorm(20)
zeepcut<-as.numeric(cut(zeep,c(-4,-0.35,0.35,4)))
plot(zeepcut,col=c("red","yellow","green")[zeepcut])

Jim

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Re: [R] How to plot with different colours

2008-11-02 Thread hadley wickham 
Hi Carlos,

I'd strongly urge to reconsider your colour choices - 7-10% of males
are red-green colour blind and it will be difficult for them to tell
the difference between the high and low values.

Hadley

On Sat, Nov 1, 2008 at 11:58 PM, Carlos Morales
<[EMAIL PROTECTED]> wrote:
> Hello everyone,
>
> I'm trying to plot 3600 points and my idea is if this value is higher than 
> 0.35 then this point must appear in green colour, if it's smaller than -0.35 
> then values must appear in red and if values are between -0.35 and 0.35 they 
> must be in yellow. I'm thinking and I'm trying many things but I don't 
> achieve it. Any idea?.
>
> Thanks so much
> Carlos Morales Diego
>
>
>
>
> __
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
http://had.co.nz/

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Re: [R] How to plot with different colours

2008-11-02 Thread Carl Witthoft 

Carlos Morales wrote:

> Hello everyone,
>
> I'm trying to plot 3600 points and my idea is if this value is higher 
than 0.35 then this point must appear in green colour, if it's smaller 
than -0.35 then values must appear in red and if values are between 
-0.35 and 0.35 they must be in yellow. I'm thinking and I'm trying many 
things but I don't achieve it. Any idea?.

Hi Carlos,
This may be what you want:

zeep<-rnorm(20)
zeepcut<-as.numeric(cut(zeep,c(-4,-0.35,0.35,4))) 
plot(zeepcut,col=c("red","yellow","green")[zeepcut])


Jim

--
At the risk of promoting my own code :-),  if you want to plot lines 
with this sort of value-dependent color instead of points (or in 
addition),  the function clplot() in the Plotrix package will do it for you.


Carl

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