extract number of genes in normalised_data.rData which is in object

Question

[cara78]

Hello,

i am trying to extract the number of genes from normalised_data to use in a for loop

norm_data <- just.gcrma(cel_files)

get the number of genes out of norm_data

and then use in for loop

So my question is to get that out so can use

thanks

Answer 1

[Devon Ryan]

just.gcrma() returns an ExpressionSet, so exprs(norm_data) should work. BTW, try to avoid for loops in R if you can, they're really slow.