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st: matrix-addressing rownames-inserting missings


From   "Nicole Schneeweis" <Nicole.Schneeweis@jku.at>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: matrix-addressing rownames-inserting missings
Date   Fri, 03 Jun 2005 11:24:56 +0200

hello,

i'm exporting cells out of matrices, and have a problem when cells are
missing.

To be more precise:

it's important for me, to address the relevant row of a matrix with its
name, not with its number (because it's a loop and numbers are changing,
not names)

e.g. matrix M  is defined with rownames, a, b, c. I need the first
column of row "b" and therefore I create a new matrix: matrix
B=M["b",1].

Now, the problem is the following: in some matrices (of the loop) not
all rows are available, but eg only the rows a and c.

The loop stops when "b" is not found! I want Stata to insert a missing
and going on, rather than giving the error message and stopping the
loop!

Possilbly there is an option, how to treat not-found-rows or an
if-function has to be implemented. But how?

Does anyone know a solution to this problem???

Thanks 
Nicole


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