Replacing string character in specific position in the variable

[Agus Ruslani]

Hello, everyone.

I am sorry if I repeated the same topic with, someone did.
I have a problem in replacing string character in a specific position. Let say; I have a variable ID which its type is the string and 10 char long.

ID
0013003001
0013004001
0023001003
0033001003
0033003003

I want to make a new variable that consists of ID variable value but replacing the "3" character in coordinate position (3,1) only by "1" character . If I could make it, the new variable will become like this:

ID_new
0011003001
0011004001
0021001003
0031001003
0031003003

How to make it using a command in stata?
Thank you.

[Nick Cox]

I have worked to reproduce your example. I can't make sense of "coordinate position (3, 1)" as a description of what you want.

clear 
input str10 ID
0013003001
0013004001
0023001003
0033001003
0033003003
end 

gen ID_new = substr(ID, 1, 3) + "1" + substr(ID, 5, .) 

list 


     +-------------------------+
     |         ID       ID_new |
     |-------------------------|
  1. | 0013003001   0011003001 |
  2. | 0013004001   0011004001 |
  3. | 0023001003   0021001003 |
  4. | 0033001003   0031001003 |
  5. | 0033003003   0031003003 |
     +-------------------------+

[Agus Ruslani]

Solved by your help Nick. Thank you so much.