If you work in a scientific environment, you might work with LaTex. The question is how to get the table which we calculated with R to our LaTeX-paper without typing by hand.
One answer (as usual, there is always more than one way)  is to use the package “xtable”. To use this package, we have to install it first.

 install.packages("xtable")

And of course load it into our actual environment.

 library(xtable)

Now we can try it. Therefore we create a sample matrix result

result <- replicate(6, rnorm(10)) # random matrix

It should look similar, with different numbers, because we generated “random” numbers with rnorm:

            [,1]       [,2]        [,3]       [,4]       [,5]
 [1,]  1.5238250  0.6211481 -0.84720876  0.6180783 -0.1183714
 [2,] -0.8544256 -0.6308093 -0.72569442 -0.5762616  0.5040542
 [3,]  0.2988900 -1.5284343 -0.98393547 -1.5724599  0.3786788
 [4,]  1.9434472 -0.8336343  1.00989785  0.6229649 -0.7081008
 [5,]  0.9100517  1.1592287  0.08582132 -0.4478348 -2.0522663
 [6,] -0.4425697 -0.7471994 -0.22674705 -1.4229096  0.9369558
 [7,]  0.4013912 -0.7872627  1.48209638  0.2740836 -0.5614954
 [8,] -0.4750461 -0.4686828  0.80015906  1.2461592 -0.5779230
 [9,] -1.9628477  0.5800184  0.30853656  0.0465059  0.8173968
[10,]  1.2018598 -1.4571664  0.49775135 -0.2378211 -1.8798817

The LaTeX code can now be generated with

xtable(result)

The result should look like this:

% latex table generated in R 2.13.1 by xtable 1.6-0 package
% Thu Nov 10 14:00:07 2011
\begin{table}[ht]
\begin{center}
\begin{tabular}{rrrrrr}
  \hline
 & 1 & 2 & 3 & 4 & 5 \\
  \hline
1 & 1.52 & 0.62 & -0.85 & 0.62 & -0.12 \\
  2 & -0.85 & -0.63 & -0.73 & -0.58 & 0.50 \\
  3 & 0.30 & -1.53 & -0.98 & -1.57 & 0.38 \\
  4 & 1.94 & -0.83 & 1.01 & 0.62 & -0.71 \\
  5 & 0.91 & 1.16 & 0.09 & -0.45 & -2.05 \\
  6 & -0.44 & -0.75 & -0.23 & -1.42 & 0.94 \\
  7 & 0.40 & -0.79 & 1.48 & 0.27 & -0.56 \\
  8 & -0.48 & -0.47 & 0.80 & 1.25 & -0.58 \\
  9 & -1.96 & 0.58 & 0.31 & 0.05 & 0.82 \\
  10 & 1.20 & -1.46 & 0.50 & -0.24 & -1.88 \\
   \hline
\end{tabular}
\end{center}
\end{table}

This is the generic LaTeX code to generate a table in your paper. The standard settings will print just two digits. If we want to have more, we can tell xtable to write more. The command

xtable(result, digits=3)

gives us the same table but with three digits.
If you want, you can also print the table into a document. The command

print(xtable(result, digits=3), type="latex", file="output.tex")

does that for you.

Sometimes, especially if you use a variable as a container for a lot of calculation results, e.g., if there are correlations to calculate for a set of variables, you want to save the output to a file to print it out or use it otherwise. For tables that is not a problem. Here we can use the write command in R. But what to do if there is a list saved in the variable?
Here we can use the command sink(). Like pdf(), sink() sends the output of the following commands to a file.

So

sink("sink-examp.txt")
i <- 1:10
outer(i, i, "*")
sink()

writes

      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
 [1,]    1    2    3    4    5    6    7    8    9    10
 [2,]    2    4    6    8   10   12   14   16   18    20
 [3,]    3    6    9   12   15   18   21   24   27    30
 [4,]    4    8   12   16   20   24   28   32   36    40
 [5,]    5   10   15   20   25   30   35   40   45    50
 [6,]    6   12   18   24   30   36   42   48   54    60
 [7,]    7   14   21   28   35   42   49   56   63    70
 [8,]    8   16   24   32   40   48   56   64   72    80
 [9,]    9   18   27   36   45   54   63   72   81    90
[10,]   10   20   30   40   50   60   70   80   90   100

to the file.