Dear Statalisters,
I want to return a string among the r() values from a Mata function.
According to the manual, the following function is to be used in this case:
st_strscalar(string scalar name, string value)
(see help st_numscalar)
The manual says that "1. All functions allow name to be ... r() scalar
such as r(mean)"
It does not seem to work however. The following is what happened:
**-------------1------------------------------------------------------------------------------
: mata clear
: void function my_test() {
> st_strscalar("r(my_name)" ,"my_value")
> }
: my_test()
st_strscalar(): 3300 argument out of range
my_test(): - function returned error
<istmt>: - function returned error
r(3300);
As an alternative, I tried to store my string value to a local via st_local:
**-------------2------------------------------------------------------------------------------
: mata clear
: void function my_test() {
> st_local("r(my_name)" ,"my_value")
> }
: my_test()
_r(my_name) invalid name
st_local(): 3300 argument out of range
my_test(): - function returned error
<istmt>: - function returned error
r(3300);
Finally, to make sure the problem is related to strings I tried the numbers:
**-------------3------------------------------------------------------------------------------
: mata clear
: void function my_test() {
> st_numscalar("r(my_name)" ,123)
> }
: end
. mata my_test()
. return list
scalars:
r(my_name) = 123
**--------------------------------------------------------------------------------------------
My question is: does st_strscalar() work as described in the manual? Can
anyone provide an example, please?
If it does not work or serves a different purpose, what is a way to
return strings
as r() values from Mata? (I know I can write to local or global
macros, this is not
an issue here, I want to write to r()).
Thank you,
Sergiy Radyakin
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