On Apr 1, 2009, at 5:57 PM, Jacob Wegelin wrote:
Suppose we have a matrix BETA with -rownames- and -colnames-.
Given the names of a row and of a column in BETA, it is possible to
extract the indices of that row and of that column, as shown below.
But is there an equally simple approach to the reverse problem? I
mean: Given a row index, is there an elegant way to extract the name
of that row?
You can use the Mata functions st_matrixrowstripe() and
st_matrixcolstripe(). For example, a minimal implementation of your
getRowName program would be:
mata:
string scalar getRowName(string scalar matname, real scalar row)
{
return(st_matrixrowstripe(matname)[row, 2])
}
end
Then, to get the name of the 5th row (i.e., "flea" in your example),
you would use:
mata: getRowName("BETA", 5)
-- Phil
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