[R] need help

[Weiwei Shi]

Hi, there:
here is some part from my previous email:

          [,1]      [,2]       [,3]       [,4]       [,5]
[1,] 34.216166 96.928587 330.125990 330.183222 330.201215
[2,]  2.819183  8.134491   8.275841   8.525256   8.828448
[3,]  2.819183  7.541680   7.550333   8.374636   8.690998
[4,]  4.672551  5.036353   5.072710   5.152218   5.223204
[5,]  5.470131  5.500513   5.674139   5.689151   5.770423
[6,]  4.480287  4.628300   4.797686   4.814106   4.823345

I want to filter out the first 3 cases from the rest and the criteria
is I am looking for a "gap". 

My way is using std(eachrow)/median(each) and set up a threshold,
which is very naive, but fast and good enough. But I want it better
and more "academic". Please be advised. I think clustering might help,
but it needs to be quick since t2 has 30000 rows.

Thanks,


On 8/12/05, Daniel Nordlund <res90sx5 at verizon.net> wrote:
> > -----Original Message-----
> > From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at stat.math.ethz.ch]
> > On Behalf Of Weiwei Shi
> > Sent: Friday, August 12, 2005 2:05 PM
> > To: r-help
> > Subject: [R] need help
> >
> > Hi, there:
> > I think i need to re-phrase my question since last time I did not get
> > any reply but i think the question is not that hard, probably i did
> > not make the question clear:
> >
> > I want to find cases like
> > 35, 90, 330, 330, 335
> >
> > from the rest which look like
> > 3, 3, 3, 3.2, 3.3
> > 4, 4.4, 4.5, 4.6, 4.7
> > ....
> >
> > basically there is one (or more) big 'gap' in the case i seek.
> >
> > thanks,
> >
> > weiwei
> >
> > --
> > Weiwei Shi, Ph.D
> 
> Weiwei,
> 
> You will have to specify what you mean by a big gap before anyone can help.  And I still don't understand what your data look like.  Is
> 
> 35, 90, 330, 330, 335
> 
> supposed to represent a sequence or a row of a matrix (or data frame)?
> 
> Dan Nordlund
> Bothell, WA
> 
> 
> 


-- 
Weiwei Shi, Ph.D

"Did you always know?"
"No, I did not. But I believed..."
---Matrix III