how to output the results from mata to stata variable?

[Fred Lee]

I want to store the reuslts "1", how to do that?

* Example generated by -dataex-. To install: ssc install dataex
clear
input byte(k61 gender) float age byte edu
0 1 40 5
0 1 73 5
0 2 54 5
0 1 41 5
0 2 35 5
0 1 49 5
0 1 46 5
0 1 45 5
2 2 37 5
1 1 40 4
end
reg k61 i.gender age edu

matrix list r(table)
mata : table = st_matrix("r(table)")

mata : sum(table[4, .] :< 0.2)

[Mike Lacy]

I'm guessing that you mean you want to store the value produced by your last Mata statement, but you don't say whether you want to store it in Mata, or in Stata as a local or as a scalar.

mata: MyResult = sum(table[4, .] :< 0.2)  // Mata variable
mata: st_local("MyResult1", strofreal(sum(table[4, .] :< 0.2)))  // Stata local
mata:  mata: st_numscalar("MyResult2", sum(table[4, .] :< 0.2)) // Stata scalar

For more information, take a look at -help m4_stata-, which describes " Stata interface functions."

[Mike Lacy]

Note, by the way, that assigning that result value to a Stata *variable* would make no sense, as the result is a single value and variables have values for each observation.

[Fred Lee]

Note, by the way, that assigning that result value to a Stata *variable* would make no sense, as the result is a single value and variables have values for each observation.

Thanks so much Mike! I solved this problem. This is part of my loop statement, therefore, the values make sense. Thanks again!