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st: Convert 3 variables to a matrix


From   Eilya Torshizian <[email protected]>
To   "[email protected]" <[email protected]>
Subject   st: Convert 3 variables to a matrix
Date   Tue, 14 Jan 2014 00:10:53 +0000

Dear Statalist members,

I need to convert three variables to a matrix. The values of variable A and B should be used as row and column names of the output matrix.  My variables are as follows,
A      B      C
A1 | A1 | C1
A1 | A2 | C2
A1 | A4 | C3
A1 | A5 | C4
A2 | A2 | C5
A2 | A1 | C6
A2 | A3 | C7

I need to convert these to the following matrix,

      A1 A2 A3 A4 A5
A1 C1 C2  0   C3  0
A2 C6 C5  C7  0   0

As I have wide range of observations, I would like to avoid nested loops.

Thanks,
Eilya.

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