Thanks for your replies, Chris, Josh, Mark, and Richard,
You've confirmed what I suspected: that it will be tricky to get the
filter command to do this. This is especially true in my case
because the data field has 56 columns by default but individual rows
may have data appended later, and so may grow beyond 56.
I think I'll do what I used to do before the filter command was
around, and that is to repeat an itemOffset over the data. I tested
the function below, which is much like Josh's, and it filters more
than 300 lines in 1 tick; the same code as a message handler rather
than a function takes 5 ticks; and the filter command on the same
data takes 39 ticks.
Thanks once again,
Gregory
function filterByColumn theData,columnNum, theSearchString
-- This function filters tab-delimited data by column
if columnNum is an integer
then
set the itemDelimiter to tab
repeat for each line thisLine in theData
if item columnNum of thisLine is theSearchString
then
put thisLine & return after filteredData
end if
end repeat
delete the last character of filteredData
return filteredData
else
return "The column number must be an integer."
end if
end filterByColumn
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