Problem in creating a string variable

[Paris Rira]

Hi dear profs and colleagues,

I am going to create the native_districts_constant variable. The variable is "metro".
I use this code:

label define  metroo 1  "Centro-Lisboa" 0 "other"
label values metro metroo
decode metro, gen(metarea_str)
replace metarea_str=proper( metarea_str)
split metarea_str, p(,)
drop metarea_str
replace metarea_str =upper(metarea_str)
egen metarea_str=concat(metarea_str1 metarea_str2), p(",")

BUT it says:variable metarea_str2 not found, it is supposed to be but is not. Could anyone have a look at my code to see what is missing? Thank you so much.

 egen metarea_str=concat(metarea_str1 metarea_str2), p(",")
variable metarea_str2 not found

* Example generated by -dataex-. For more info, type help dataex
clear
input float metro
1
1
0
1
1
1
0
1
0
1
0
1
0
1
1
0
0
0
1
0
1
1
0
1
0
1
1
1
1
0
1
0
0
1
0
end
label values metro metroo
label def metroo 0 "other", modify
label def metroo 1 "Centro-Lisboa", modify

Cheers,
Paris

[Carlo Lazzaro]

Paris:
actually, running your code, I was not able to find out -metarea_str2-:

. set obs 2
Number of observations (_N) was 0, now 2.

. g metroo=_n-1

. label define  metroo 1  "Centro-Lisboa" 0 "other"

. label values metro metroo

. decode metro, gen(metarea_str)

. replace metarea_str=proper( metarea_str)

. drop metarea_str

. replace metarea_str =upper(metarea_str)

. list

     +-------------------------------+
     |        metroo    metarea_str1 |
     |-------------------------------|
  1. |         other           OTHER |
  2. | Centro-Lisboa   CENTRO-LISBOA |
     +-------------------------------+

.

[Paris Rira]

Dear Carlo,

Thank you for getting back to me.
You are right. I don't know why I thought that should exist --metarea_str2.
I run yours:

 
 drop metarea_str  replace metarea_str =upper(metarea_str)
variable metarea_str not found

[Carlo Lazzaro]

Paris:
this is your turn to be right !
Just drop the following chunk of code:

 drop metarea_str

and things should work out fine.

[Paris Rira]

That worked perfectly.
All my thanks Prof Carlo.