docs: public static DMatrixRMaj loadCSV(String fileName , int numRows , int numCols )
          throws IOException
      {
          FileInputStream fileStream = new FileInputStream(fileName);
          ReadMatrixCsv csv = new ReadMatrixCsv(fileStream);
  
          DMatrixRMaj ret = csv.readDDRM(numRows, numCols);
  
          fileStream.close();
  
          return ret;
      }