create a unique random integer.

[Cyprienne Boedard]

Hello, I want to create a unique random integer.
I have 34 observations and I wish to have for each observation a number between 1 and 34 which is not identical to the observation


Here is my code: With this code, no data is modified in the table

gen expert= runiformint(1, 34)
bysort expert: gen doublon=_n

while doublon!=1 | a==expert{
replace expert= runiformint(1, 34)
drop doublon
bysort expert: gen doublon=_n }




Example: I don't want the errors in lines 4 and 5

a	expert	doublon
1	11	1
2	6	1
3	15	1
4	15	2
5	5	1

[Nick Cox]

set seed 18012022 
gen double random = runiform()
sort random 
gen wanted = _n 
isid wanted

[Cyprienne Boedard]

Thank you, I did not know these formulas set seed and isid !