Convert seconds to HH:MM:SS.FF

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Yu
Yu 2021-8-27
评论： Yu 2021-8-27
I have time stamps that have hh:mm:ss and nanoseconds in different columns and want to convert them to hh:mm:ss.ff.
I did as following but have no idea what to do next.
Any ideas on how can I do this?
Thanks.
clear
load sample.mat
sample.SECONDS = datenum(sample.TIME)+sample.NANOSECONDS*10^(-9);

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Walter Roberson
Walter Roberson 2021-8-27
sample.SECONDS = datenum(sample.TIME) + seconds(sample.NANOSECONDS*10^(-9));
sample.SECONDS.Format = 'hh:mm:ss.ff';
The second step will be rejected because datetime() objects have no 'ff' format specification. (And be careful, since for datetime() object, 'hh' is hour in 12 hour notation)
Perhaps you want to use datenum objects. However, datenum objects do not have a 'ff' specification either: they have a 'FF' specification.
I recommend
sample.SECONDS.Format = 'HH:mm:ss.SS';
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Walter Roberson
Walter Roberson 2021-8-27
sample.SECONDS = sample.TIME + seconds(sample.NANOSECONDS*10^(-9));
sample.SECONDS.Format = 'HH:mm:ss.SS';
Yu
Yu 2021-8-27
This worked well!
Thank you so much! I really appreciate your help.

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