Can lineOffSet find last occurance?

Ken Ray kray at sonsothunder.com
Fri Aug 30 13:56:01 EDT 2002


----- Original Message ----- 
From: "Bill Vlahos" <bvlahos at jpl.nasa.gov>
To: <use-revolution at lists.runrev.com>
Sent: Friday, August 30, 2002 1:23 PM
Subject: Can lineOffSet find last occurance?


> I need to process a subset of lines in a field which has been sorted. 
> All of the group of lines I want are together because of the sort. What 
> I'm doing now is using a repeat for each line command and checking each 
> line to see if it contains what I'm looking for. This works fine but 
> will eventually slow down with big data sets. I would like to use the 
> repeat for each feature which includes the starting and ending lines.
> 
> The lineOffSet command neatly finds the first line of what I want but 
> how can I find the last line? Can lineOffSet be made to start and the 
> end?
> 
> I could leave the check for what I want and exit the handler after 
> starting at the offset but it should be faster if I could remove the 
> check. I am confident that the sorting will put what I want together.
> 
> Another option would be to put the field into a variable and then 
> filter the variable and do the processing on what remains. I don't know 
> how much of a performance hit the putting and filtering would be. This 
> lineOffSet command seems pretty fast.
> 
> Thanks,
> Bill Vlahos
> 
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