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 simple question about time columns
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noff73

USA
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Posted - 11/22/2006 :  06:07:21 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi! I think my question is pretty simple but I still struggle to solve it:( So, I am calculating the experimental data in my beta-galactosidase assay. I have one column (say, ColB), which has the time format (mm:ss). ColumnC has some numerical values (optical density of samples at 420nm). For estimating the activity I have to do the division procedure: ColC/ColB. But whenever I am doing that - I am getting some weird numbers (f.ex. 0,436 / 24:45 - the result is 25.3673)...
- Could you tell me, please, what can be wrong?
- Or, as alternative, is there any simple way for converting my original time format (mm:ss) into secunds only?

Sincerely,
Ilya

Mike Buess

USA
3037 Posts

Posted - 11/22/2006 :  08:42:26 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Cells of date columns are Julian dates with unit equal to number of seconds per day = 87840. Therefore 24:45 is really 0.0171875 and 0.436/0.0171875 = 25.3673. If you want to divide by seconds use ColC/(ColB*87840)

Mike Buess
Origin WebRing Member
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noff73

USA
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Posted - 11/22/2006 :  11:01:09 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thank You very much:)
Ilya
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