Problem: Error in output$nodeID: $operator is invalid for atomic Vectors when viewing variable columns using the “$” operator
output <- data$score output <- cbind(nodeID=dat$nodeID,score=output) head(output$nodeID) Error in output$nodeID : $ operator is invalid for atomic vectors # Check the type of output and find out it's matrix. class(output)  "matrix" #"data.frame" can only be used with "$", just use [,] here. head(output[,1])
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