[R] Odp: Need to clean a table, and compute mean and SD

[Petr PIKAL]

Hi

r-help-bounces at r-project.org napsal dne 04.05.2009 09:53:19:

> 
> Hi
> 
> For a school project I have a file with 120 columns and  ~2000 lines. 
This
> file contains timestamps of spike detected in 60 channels, and the time
> elapsed between the last spike.
> 
> I need to clean too high values. About 98% of values are between 0 and 
2000
> and 2% are between 2000 and 20'000. I want to get rid of theses values.
> 
> Please could you help me?

Decide your threshold value. Let say it is 2000. Then it depends how do 
you want to get rid of the data.

e.g.

mat[mat>2000]<-NA

shall put NA values instead all items which were bigger than 2000.

Regards
Petr



> 
> Regards 
> 
> Thom
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