[R] How can I make a list using aggregate function?

[sureshraj]

Hi friends, 

   I need to generate a list, that should contain the quantile value of one
column in a data frame. while I am compiling this one i am facing one bug,,
Really I cannot find out that where the problem has occurred?  Could any one
help me to come out from this bug?? 

Here is the code, 
data <- lapply(comb.data$zFE, function(x) aggregate(x,
by=list(comb.data[["sequence"]]), quantile, probs=c(0.5,0.8,0.9), na.rm=T))

And I am facing bug like this, 
"Error in aggregate.data.frame(as.data.frame(x), ...) : 
  arguments must have same length"

Thanks, 
Suresh

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