[R] Excluding all teh columns from a data frame if the standard deviation of that column is zero(0).

[siddu479]

Hi All,

  I have a data frame where nearly 10K columns of data, where most of them
have standard deviation( of all rows) as zero.
I want to exclude all the columns from the data frame and proceed to further
processing.

I tried like blow.  
*data <- read.csv("data.CSV", header=T)

for(i in 2:ncol(data))
 if(sd(data[,i])==0){
 df[,i] <-NULL
}
*
where I have the data columns from 2:ncol, but getting the error "Error in
df[, i] <- NULL : object of type 'closure' is not subsettable"

Can any one suggest the right method to accomplish this.






-----
Sidda
Business Analyst Lead
Applied Materials Inc.

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