
Hi,

I tried to use esApply to analyze affy data (aaa) saved in affyBatch. However it created some problem.

f<- function(x) 
{  
   tmp <- t.test(x[index2-1],x[index1-1])
   c(mean(tmp$estimate), diff(tmp$estimate), tmp$statistic, tmp$p.value)
}

scores <- esApply(exprs(expr), 1, f)

Error in function (classes, fdef, mtable)  : 
unable to find an inherited method for function "esApply", for signature "matrix"

Can anybody help me out. what is the problem? Thank you in advance!

LL



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