Hugh, just did a test.. Rather than putting empty into the line and then filtering without empty, seems to be quite a bit faster to "then delete line x of tVar"
Still has the slowdown caused by accessing the lines of the var using "line x of.." but saves the time for the filter. With the data I generated for the test, 100k lines, the delete method took 5.3 secs, the filter method took 14.5. The system i'm on at the moment, only has LC 6.6.2 though, and I seem to remember someone mentioning large speed differences depending on LC version, so if i'm running into that, someone let me know. Or if there is a reason to NOT directly delete the line, let me know that too. On Sat, Aug 30, 2014 at 1:45 AM, FlexibleLearning.com < ad...@flexiblelearning.com> wrote: > Peter Haworth <p...@lcsql.com> wrote > > > There's another situation where I use repeat with even though it's a > little > > slower than repeat for and I also alter the contents of the data I'm > > repeating through without any problems. > > > > repeat with x=the number of lines in tVar down to to 1 > > if <data condition on line x of tVar> then > > delete line x of tVar > > end if > > end repeat > > This is an insightful observation. Nice one, Pete! > > My stock method (and presumably the method you allude to above) is... > > repeat for each line L in tVar > add 1 to x > if <data condition on L> then put "" into line x of tVar > end repeat > filter tVar without empty > > Both methods operate on a single data set and avoid putting the output into > a second variable which, for large datasets, involve an unnecessary memory > overhead.. > > Hugh Senior > FLCo > > > > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your > subscription preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode > _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
