st: Using stata local macro in mata

[Benjamin Villena <b_villena@yahoo.com>]

Dear Stalist members,
My problem is as follows. I try to run a do file (let's call it rou.do) that contains
a mata routine using a parameter value kappa.
I would like to run rou.do several time using different values for kappa so
I built a forv loop such as

forv k=1/10{
     do rou.do
}

In rou.do, the first lines read like this

mata
kappa = strtoreal(st_local("k"))

However, I cannot make mata to read the local k correctly. The mata code
crashes because of that. While debugging in mata, the value of kappa is
just missing (a dot)

If I do this directly in stata's command line by typing

local k=1
mata
kappa = strtoreal(st_local("k")),

kappa's value is 1.


What's wrong with my approach? How could I "import" a local macro in mata
correctly?

 Thanks


Benjamín 

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