Storing scalars into a vector - help with a loop

[Matteo Bulgarelli]

Good evening to everyone,

I need to basically append an empty list: after a loop in which I create some scalars, at the end of each scalar creation I would love to plug it into a cell. I think it should be possible with some combinations of

 generate

and

 replace

, but I can't figure out how to solve the issue... Here is the code:

forvalues i = 2(1)48{
    count if Z_`i' == 1 & Prom__20161 >= 4 & Prom__20161 !=.
    scalar NZ_`i'_1 = r(N)
    count if Z_`i' == 1 & Prom__20161 !=.
    scalar NZ_`i'_1_tot = r(N)
    scalar P_Y1_4_Z_`i'_1 = NZ_`i'_1 / NZ_`i'_1_tot
    
    count if Z_`i' == 0 & Prom__20161 >= 4 & Prom__20161 !=.
    scalar NZ_`i'_0 = r(N)
    count if Z_`i' == 0 & Prom__20161 !=.
    scalar NZ_`i'_0_tot = r(N)
    scalar P_Y1_4_Z_`i'_0 = NZ_`i'_0 / NZ_`i'_0_tot    
    scalar DIFF_`i' =  P_Y1_4_Z_`i'_1 - P_Y1_4_Z_`i'_0
    di DIFF_`i'
}

I would simply love to plug the values of DIFF_`i' into a column vector.

[William Lisowski]

Perhaps this will point you in a helpful direction.

. matrix a = (.)

. forvalues i = 2/5 {
  2.         local diff = 5 * `i'
  3.         matrix a = (a \ `diff')
  4. }

. matrix list a

a[5,1]
    c1
r1   .
r2  10
r3  15
r4  20
r5  25

For more details on Stata's matrix commands start with the output of help matrix and follow the links. Do note that Stata's matrix commands are separate from Stata's Mata language, which also concerns itself with matrices, and much else.