How to add datetime from seconds?

Question

hanif hamden 2019-5-29

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464542-how-to-add-datetime-from-seconds

评论： hanif hamden 2019-6-13

采纳的回答： Peter Perkins

ex1.txt

在 MATLAB Online 中打开

I have txt file as attached.

I have initial date time on the first row.. How i want to add this datetime with seconds for each row from first column?

This is example of my coding:

%% Input data
A = dlmread('ex1.txt');
% Identify year, month, day, hour, minute, second [Y,M,D,H,Mn,S]
Y = A(1,1); M = A(1,2); D = A(1,3); H = A(1,4); Mn = A(1,5); S = A(1,6);
dt = datetime(Y,M,D,H,Mn,S)
% Identify parameter after 2nd Row
Ts = seconds(A(2:end,1)); lat = A(2:end,2); lon = A(2:end,3); h = A(2:end,4);
dt.Second = dt.Second + Ts

When I run, the error showed like this:

Error using Test (line 12)

Numeric input data must be real.

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Answer 1

Peter Perkins 2019-6-4

1
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https://ww2.mathworks.cn/matlabcentral/answers/464542-how-to-add-datetime-from-seconds#answer_377809

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That's not the error that I get, but it's possible that you are using an older version with different error handling.

In any case: The .Seconds property of a datetime, like all six of the time component properties, is a raw numeric value (it's the .Second property after all, there'd be no point in it having units). You are trying to add a duration to it. You want to either do this:

dt.Second = dt.Second + A(2:end,1)

or (better) this:

dt = dt + seconds(A(2:end,1))