[BioC] how to add SD onto a plot

[James W. MacDonald]

Hi Jianping,

Jianping Jin wrote:
> Dear list,
> 
> Does any one know how to add SD information of a data set onto a plot which 
> displays mean values for each group? I did something like:
> 
> 
>>x = c(0,1,2,3)
>>y = apply(data,2,mean)
>>plot(x,y)
z <- apply(dat, 2, sd)/2
for(i in seq(along = x)) arrows(x[i], y[i]-z[i], x[i], y[i]+z[i], 
angle=90, length=0.1, code=3)

Best,

Jim


> 
> 
> Thanks for you help!
> 
> Jianping
> 
> ##################################
> Jianping Jin Ph.D.
> Bioinformatics scientist
> Center for Bioinformatics
> Room 3133 Bioinformatics building
> CB# 7104
> University of Chapel Hill
> Chapel Hill, NC 27599
> Phone: (919)843-6105
> FAX:   (919)843-3103
> E-Mail: jjin at email.unc.edu
> 
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-- 
James W. MacDonald, M.S.
Biostatistician
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109
734-647-5623


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