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Re: st: Generating a vector
On May 20, 2006, at 1:07 AM, Gauri Khanna wrote:
I would like to generate an 1 x n vector, (n=326 rows) for cross
sectional data. This is actually an input price vector.
I would then want to fill it with three or four input prices that I
have computed elsewhere. Hence the same value for each of the
inputs will be repeated 326 times.
I don't understand; if the vector is 1 x 326, and if each value will
be repeated 326 times, then you'll need 4 separate vectors to hold
the 4 values, no?
I guess the first step would be to generate an empty(?)/null vector
and then fill it with values for each of the inputs.
I'm sorry, but there's really not enough here to give much of an
answer. If you want to generate a matrix containing a constant
value, then you want to use the function J(), like so:
. mat a = J(1,5,23)
. mat li a
c1 c2 c3 c4 c5
r1 23 23 23 23 23
Note that -help matrix- (followed by clicking on "matrix functions")
would have also given you this answer. So, the first "meta-answer"
to your question is really a suggestion that if you want to work with
matrices in Stata, you should spend some time with [P] matrix.
In addition, it looks as though your immediate question is just the
first step in what is really a larger problem you are trying to
tackle. If this is true, then it is really better to ask "I'm trying
to do X and I think Y is a good place to start, but I'm having
problems" rather than just asking "I can't figure out how to do Y".
There are at least two reasons for this. First, Y may not be the
best way to start, so you should give people on the list an
opportunity to tell you that; after all, getting you started on the
right path is half the battle. Second, if you are having problems
with Y, there's a good chance you will also have problems with
subsequent steps, and it's a lot more efficient for everyone involved
if you just give your whole problem up front and let people help you
with the entire thing. Moreover, this makes for much more useful
list archives (i.e., those who come along later with the same problem
will be able to find the answer in a single posting or two, instead
of spread across many).
That said, your question suggests that you are working on a economic
problem, and not being an economist, I'm afraid others may need to
help you solve it (but I too will read their answers and learn). I
apologize to the economists on the list for having volunteered your
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