Create a matrix with columns of both datetime and double format

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I want to create a matrix with these vectors:
a = [21-Mar-2021 07:44
21-Mar-2021 17:35
22-Mar-2021 07:48
22-Mar-2021 17:46
23-Mar-2021 07:49
23-Mar-2021 17:48];
b = [21
When I try the following sentence, MATLAB gives me an error:
Error using datetime/horzcat (line 1335)
All inputs must be datetimes or date/time character vectors or date/time strings.
I don't know how to merge both columns in a single matrix. Can you help me?

Accepted Answer

Mario Malic
Mario Malic on 2 May 2021
Use a cell array or a table to do so.
% Using cell array
{datetime('today'), 5}
ans = 1×2 cell array
{[02-May-2021]} {[5]}
% Using table
dt = datetime('now');
num = 5;
table(dt, num)
ans = 1×2 table
dt num ____________________ ___ 02-May-2021 07:20:58 5
  1 Comment
Steven Lord
Steven Lord on 2 May 2021
A table array would work, but a timetable array has some functionality for working with the date and time data above and beyond what you can do with a table.
dt = datetime('now');
num = 5;
tt = timetable(dt, num)
tt = timetable
dt num ____________________ ___ 02-May-2021 15:00:13 5

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