Hi All, 
I would like to create a matrix in R but I dont know the size of my matrix. I only know the size of the columns but not the size of the rows. So, is there any way to create a dynamic matrix of size NULL by n_cols? and then add to that matrix?
I know for a vector, I can do this: x= NULL but is there any way to do the same for a matrix as well?
Thanks a lot,Andra
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