How to turn a vector into a matrix in R

Question

I have a vector with 49 numeric values  I want to have a 7x7 numeric matrix instead    Is there some sort of convenient automatic conversion statement I can use  or do I have to do 7 separate column assignments of the correct vector subsets to a new matrix  I hope that there is something like the oposite of c myMatrix   with the option of giving the number of rows and or columns I want to have  of course

User · Accepted Answer

Just use matrix   matrix vec nrow   7 ncol   7    One advantage of using matrix rather than simply altering the dimension attribute as Gavin points out  is that you can specify whether the matrix is filled by row or column using the byrow argument in matrix

User · Answer

A matrix is really just a vector with a dim attribute  for the dimensions   So you can add dimensions to vec using the dim   function and vec will then be a matrix   vec  lt - 1 49 dim vec   lt - c 7  7       rows  cols  vec   gt  vec  lt - 1 49  gt  dim vec   lt - c 7  7       rows  cols   gt  vec        1    2    3    4    5    6    7   1      1    8   15   22   29   36   43  2      2    9   16   23   30   37   44  3      3   10   17   24   31   38   45  4      4   11   18   25   32   39   46  5      5   12   19   26   33   40   47  6      6   13   20   27   34   41   48  7      7   14   21   28   35   42   49

[r] How to turn a vector into a matrix in R?

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