How to write columns from multiple files into one dataframe

I have about 100 text files, each containing 3 columns. I want to read each file in an object and then the content into a matrix that has 300 columns.

Matrix created:

ptamat <- matrix(ncol=300, nrow=2665)

      

        
        
        
      

    

Reading files into an object

myfiles <- lapply(Sys.glob('pta_out__*'), read.table)

      

        
        
        
      

    

Show contents of first 2 files in myfiles object

myfiles[[1:2]]

      

        
        
        
      

    

Copy files to 'myfiles' object in matrix

ptamat[,1:300] <- myfiles[[1:100]]

      

        
        
        
      

    

The last part doesn't work. Any ideas?