Dear users, I met an error when I tried to run expression data after normalization. The first two columns are probe_id and gene symbol, the rest 12 columns are sample expression values. The file was saved in .csv format and read with function as: datE=read.csv("expression.csv") When I tried to use sampleNetwork() function to load the data, it generate an error: Error in SampleNetwork(datExprT = datE, method1 = "correlation", impute1 =FALSE, : expression matrix contains non-numeric data I changed all expression dataset to numeric, using datE.2=apply(datE[,3:14],2,as.numeric) while running the function, it has the same error. Could someone help to fix it? I do appreciate it. Thanks a lot -- output of sessionInfo(): R version 3.0.0 (2013-04-03) Platform: x86_64-apple-darwin10.8.0 (64-bit) locale: [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8 attached base packages: [1] stats graphics grDevices utils datasets methods base -- Sent via the guest posting facility at bioconductor.org.