How to build a time record from several matrices?

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!

Answer 1

[KSSV]

You can read the data from each file and combine them:

t = [A ; B ; C; D] ;

Answer 2

[Peter Perkins]

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.