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Re: st: editing string variables to remove letters and keep only numbers


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: editing string variables to remove letters and keep only numbers
Date   Tue, 18 Jun 2013 01:09:18 +0100

Should be

forval i = 1/`lmax' {


Nick
njcoxstata@gmail.com


On 18 June 2013 01:06, Michael McCulloch <mm@pinestreetfoundation.org> wrote:
> In implementing the example, I wrote, based on the variable "id":
>
> gen length = length(id)
> su length, meanonly
> local lmax = r(max)
> gen numstr = ""
> gen letterstr = ""
>
> forval i = 1/`max' {
>      replace numstr = numstr + substr(id, `i', 1) if
> inrange(real(substr(id, `i', 1)), 0, 9)
>      replace letterstr = letterstr + substr(id, `i', 1) if
> !inrange(real(substr(id, `i', 1)), 0, 9)
> }
>
> The forval statement is where I am getting the invalid syntax error.
>
>
> Best wishes,
> Michael McCulloch, LAc MPH PhD
>
> --
> Pine Street Foundation, since 1989
> 124 Pine Street | San Anselmo | California | 94960-2674
> P: (415) 407-1357 | F: (206) 338-2391 | http://www.PineStreetFoundation.org
>
> On Jun 17, 2013, at 5:02 PM, Nick Cox wrote:
>
>> Yes. The negation is intended. If a character isn't 0 to 9, it's
>> regarded as a a letter.
>>
>> Show us the exact code you typed to get a better answer.
>> Nick
>> njcoxstata@gmail.com
>>
>>
>> On 18 June 2013 00:51, Michael McCulloch <mm@pinestreetfoundation.org> wrote:
>>> Thanks Nick.
>>>
>>> On the second inrange argument, does the "!" belong there?
>>> When I run that forval command, an invalid syntax r(198) code is returned.
>>>
>>>
>>>
>>> Best wishes,
>>> Michael McCulloch, LAc MPH PhD
>>>
>>> --
>>> Pine Street Foundation, since 1989
>>> 124 Pine Street | San Anselmo | California | 94960-2674
>>> P: (415) 407-1357 | F: (206) 338-2391 | http://www.PineStreetFoundation.org
>>>
>>> On Jun 17, 2013, at 4:10 PM, Nick Cox wrote:
>>>
>>>> There are is a dedicated functions in -egenmore- (SSC) (-sieve()-)
>>>> but let's take it from first principles.
>>>>
>>>> gen length = length(strvar)
>>>> su length, meanonly
>>>> local lmax = r(max)
>>>>
>>>> gen numstr = ""
>>>> gen letterstr = ""
>>>>
>>>> forval i = 1/`max' {
>>>>     replace numstr = numstr + substr(strvar, `i', 1) if
>>>> inrange(real(substr(strvar, `i', 1)), 0, 9)
>>>>     replace letterstr = letterstr + substr(strvar, `i', 1) if
>>>> !inrange(real(substr(strvar, `i', 1)), 0, 9)
>>>> }
>>>> Nick
>>>> njcoxstata@gmail.com
>>>>
>>>>
>>>> On 17 June 2013 23:53, Michael McCulloch <mm@pinestreetfoundation.org> wrote:
>>>>> I have a variable in my dataset that (due to changes in data entry practices over time) contains several styles of the variable ID:
>>>>>
>>>>>       - a number (e.g. 164)
>>>>>       - a letter-number combination (e.g. e64)
>>>>>       - a comma-separated letter-number combination (e.g. e64,e65)
>>>>>
>>>>> In seeking to (A) remove the letters, and (B) separate the comma-separated into two separate variables, ID1 and ID2, I wrote the following argument:
>>>>>
>>>>> . split ID, p(",")
>>>>> . gen str id1_new =""           // make new ID to separate out the "e" from ID
>>>>> . replace id1_new=substr(id1,2,3)
>>>>>
>>>>>
>>>>> This successfully splits ID into ID1 and ID2.
>>>>>
>>>>> This also works if:
>>>>>       a 3-digit variable has a preceding letter (e64 is changed to 64)
>>>>>
>>>>> However, in the case of a 3-digit values WITHOUT PRECEDING LETTER, the first digit is removed (164 is changed to 64).
>>>>>
>>>>> Any suggestions would be appreciated.
>>>>>
>>>>>
>>>>> Best wishes,
>>>>> Michael McCulloch, LAc MPH PhD
>>>>>
>>>>> --
>>>>> Pine Street Foundation, since 1989
>>>>> 124 Pine Street | San Anselmo | California | 94960-2674
>>>>> P: (415) 407-1357 | F: (206) 338-2391 | http://www.PineStreetFoundation.org
>>>>>
>>>>>
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