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I've calculated the cophenetic coefficients for the NMF of gene expression data, but is giving error when performing the clustering information step as given below:

clustered_data <- NMF_estimate[[num.opt - 1]][[2]]

Error in NMF_estimate[[num.opt - 1]] : subscript out of bounds

Here num.opt is num.opt <- coph[which(coph[,2]==max(coph[-1,2])),1] which gives 2, 5 as outputs, and NMF Estimate is a list of 6 elements.

Please suggest a solution as soon as possible.

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