How to build a time record from several matrices?

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EB
EB 2017-4-11
回答： Peter Perkins 2017-4-12
Hi, I have four matrices A, B, C, D and they are each (1x409752). These matrices are actually extracted from a time record that had format "Y-M-D H:MI:S:MS". A is now equal to H B is equal to MI C is equal to S D is equal to Ms
The start time from "Y-M-D H:MI:S:MS" is 13:58:52.12000 and the end time is 14:01:02.932000. Or from separate matrices: A(1) = 13; B(1) = 58; C(1) = 52; D(1) = 12000;
A(end) = 14; B(end) = 01; C(end) = 02; D(end) = 932000;
How can I combine matrix A, B, C and D to build a time stamp in seconds? I need this time stamp for plotting recorded data.
Many thanks!

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回答（2 个）

KSSV
KSSV 2017-4-11
You can read the data from each file and combine them:
t = [A ; B ; C; D] ;
Peter Perkins
Peter Perkins 2017-4-12
If you're using R2014b or newer, use durations:
>> A = [1;2;3;4]; B = [5;6;7;8]; C = [9;10;11;12]; D = [13;14;15;16];
>> dt = duration(A,B,C,D);
>> dt.Format = 'hh:mm:ss.SSS'
dt =
4×1 duration array
01:05:09.013
02:06:10.014
03:07:11.015
04:08:12.016
>> plot(dt,x)
If you are creating A,B,C,D from text, you should skip the middle man and create a datetime from the text, then call timeofday to get the durations.

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