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Excel VBA Discuss using VBA for Excel programming.
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Old October 27th, 2004, 04:12 AM
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Default How to reduce the processing time for this prob?

Hi all! I have a question on how to automated this process.

i have some data which looks like these:
Time Day Y X Speed
6:12:21 Monday 3.137623456 101.6953814 57
6:12:27 Monday 3.136615051 101.6952216 71
6:12:32 Monday 3.135641022 101.6951024 75
6:12:37 Monday 3.134624022 101.6949792 75
6:12:42 Monday 3.133702706 101.6947838 75
6:12:47 Monday 3.132911451 101.6942716 71
6:12:53 Monday 3.132395216 101.6934099 61
     . . . . .
     . . . . .

and i need to do some filtering on it which is based on the following criteria:

Day Time Segment
Monday 7:00:01 - 7:05:00 3.137263<=Y<=3.138149
Tuesday 7:05:01 - 7:10:00 3.136371<=Y<=3.137263
Wednesda 7:10:01 - 7:15:00 3.135472<=Y<=3.136371
Thursday 7:15:01 - 7:20:00 3.134575<=Y<=3.135472
Friday 7:20:01 - 7:25:00 3.133716<=Y<=3.134575
Saturday ... ... 3.13297<=Y<=3.133716
Sunday . Y<=3.13297AND101.693463<=X
              20:55:01 - 21:00:00 101.692597<=X<=101.693463

i.e. I need to have the average speed and standard deviation of a group of data that fall in OR meet the criteria:
certain "Day" (monday....sunday) and within certain "time" (between 7:00:00 to 7:05:00, 7:05:00 to 7:10:00, up to 20:55:00 to 21:00:00) and satisfy certain criteria "segment " (3.137263<=Y<=3.138149.and so on....until the last segment)

I know this can be done by using the "auto filtering", however it is too tedious as i have to repeatly select those criteria one by one which may results to 7(days) x 169 (duration) x 127 (segment criteria) = 150241 trials!!!!

I have tried pivot table too, but it cannot support the numbers of data that i have (around 30-40k). When i try a small portion of my data using pivot tables, instead of select "range of criteria" i.e. (say time from 7:00:00 to 7:05:00) it can only select "a particular criteria" i.e. (say, 7:01:30 or 7:02:01 and etc).

Besides, there are 3 types of criteria in the "segment" criteria. 1) involve satisfying variable Y only, 2) involve satisfying variable X only, 3) involve satisfying variable X and Y.

The expected VBA may be extremely slow, is there any faster way to do this? If there is no, how can i write that slow VBA?

Please guide me in detail as i just start to know VBA not more than 7 days. Any reply is appreciated, thanks!

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