Create a data frame with m columns and 2 rows

Question

I would like to create a data frame in R with m  a variable  number of columns  for example 30   and 2 rows and fill all the values in the data frame initially with 0 s  It seems as though data frame populates values based on rows rather that columns  any suggestions how I can do this  Thanks

User · Answer

Does m really need to be a data frame   or will a matrix   suffice   m  lt - matrix 0  ncol   30  nrow   2    You can wrap a data frame   around that if you need to   m  lt - data frame m    or all in one line  m  lt - data frame matrix 0  ncol   30  nrow   2

User · Answer

For completeness   Along the lines of Chase s answer  I usually use as data frame to coerce the matrix to a data frame   m  lt - as data frame matrix 0  ncol   30  nrow   2    EDIT  speed test data frame vs  as data frame  system time replicate 10000  data frame matrix 0  ncol   30  nrow   2        user  system elapsed    8 005   0 108   8 165   system time replicate 10000  as data frame matrix 0  ncol   30  nrow   2        user  system elapsed    3 759   0 048   3 802    Yes  it appears to be faster  by about 2 times

[r] Create a data.frame with m columns and 2 rows

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