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Re: st: how to define a matrix with mathematical expression

From   Nina YIN <>
Subject   Re: st: how to define a matrix with mathematical expression
Date   Mon, 10 Sep 2012 14:55:05 +0200

Okay, Nick, thank you for your answer,  Symbolic manipulation is
exactly what I want.
Maybe I should return to Matlab to deal with it.

On Mon, Sep 10, 2012 at 2:49 PM, Nick Cox <> wrote:
> I don't think I can add much to my previous post. The key is that
> Stata expects to be given a number for each element of a matrix. It
> won't do symbolic manipulation, if that is what you are seeking.
> If you made concrete what your matrix is, that might help make clear
> what you are finding difficult to understand.
> Nick
> On Mon, Sep 10, 2012 at 1:37 PM, Nina YIN <> wrote:
>> Hi Nick,
>> Thank you for your reply!
>> Does you mean that I should make these derivations into vectors and
>> then define them into matrix?
>> However, it's a big matrix with size110*110. Also I want to define the
>> element "x_{ij}" as
>> if some condition satisfied, x_{ij}= partial Di/partial Pj;
>> else  x_{ij}=0.
>> Therefore, it would be a problem if it need me to define each element by hand.
>> Do you have any idea about this? Thank you very much!
>> Best,
>> Nina
>> On Mon, Sep 10, 2012 at 2:27 PM, Nick Cox <> wrote:
>>> I think you are correct. If your matrix is a matrix of partial
>>> derivatives, you have to do any calculus derivations yourself.
>>> Nick
>>> On Mon, Sep 10, 2012 at 1:22 PM, Nina YIN <> wrote:
>>>> I am trying to construct a matrix with elements defined in
>>>> mathematical expression. For example, a m*m matrix A with elements
>>>> "a_{ij}"=partial Di/ partial Pj. Di (Pj) is the i-th ( j-th ) element
>>>> of variable D(P).
>>>> I just know -matrix define and -mkmat, however I didn't find out that
>>>> these two commands could help me in this problem. Do I understand it
>>>> well?
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Best Regards,
Nina YIN

Toulouse School of Economics
Manufacture des Tabacs
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