How to create an empty matrix in R?

matrix, na, r

Solution

The default for `matrix` is to have 1 column. To explicitly have 0 columns, you need to write

matrix(, nrow = 15, ncol = 0)

A better way would be to preallocate the entire matrix and then fill it in

mat <- matrix(, nrow = 15, ncol = n.columns)
for(column in 1:n.columns){
  mat[, column] <- vector
}

Problem

I am new to R. I want to fill in an empty matrix with the results of my `for` loop using `cbind`. My question is, how can I eliminate the NAs in the first column of my matrix. I include my code below: ``` output<-matrix(,15,) ##generate an empty matrix with 15 rows, the first column already filled with NAs, is there any way to leave the first column empty? for(`enter code here`){ normF<-`enter code here` output<-cbind(output,normF) } ``` The output is the matrix I expected. The only issue is that its first column is filled with NAs. How can I delete those NAs?

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