Hi, Ligia, I'll need your help with defining the batch slot in cellHTS2 again.I run into problem and I think either there's a bug in the function code of cellHTS2 or I'm doing something extremely stupid here. I have 76 plates(in 96 well format) in dulipate, and first 3 batch each has 20 plates within a batch(with duplicate, which means 40 plates total for each batch). my code to define the batch as follows: (regards to the description of the package I need to define a array with dimension of (96*76,2,1) to feed to "batch" function) "DL" is my cellHTS object; ind=c(rep(1:3,each=96*20),rep(4,96*16)) bt=array(rep(ind,2),dim=c(96*76,2,1)) #an array with dimensions 'Features x Samples x Channels' (7296 x 2 x 1) batch(DL) <- bt but I got error message as follows,which is very confusing(asked me to build array with dimension of plate number,sample and channel): >Error in `batch<-`(`*tmp*`, value = c(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, : 'value' should be an array of integer values corresponding to the batch number for each plate, sample and channel! So, I changed the array as suggested by the error message due to curiosity: ind2=c(rep(1:3,each=20),rep(4,16)) bt2=array(rep(ind2,2),dim=c(76,2,1)) batch(DL) <- bt2 But then got error message as belows: >Error in `batch<-`(`*tmp*`, value = c(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, : 'value' should be an array with dimensions 'Features x Samples x Channels' (7296 x 2 x 1). Which suggested I should use the code from the first block. I fell into a loop here, which I couldn't figure out what's wrong. Could you help to point out to the right direction or give me some clues here? thanks a lot. yan