Create an array of empty durations
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Is there a way to create an array of durations similar to the way I can create an array of strings, zeroes etc. i.e.
str = strings(size, 0)
i tried something like
dur = durations(size, 0)
but that does not work.
采纳的回答
Walter Roberson
2017-11-21
编辑：Walter Roberson
2017-11-21
duration(nan(NumberOfEntries,3))
If you want a 2D array of durations then you would probably need to reshape() the above.
Alternately you could use
NaT(numrows, numcols) - NaT(1)
to get a numrows x numcols duration array.
3 个评论
Christian Breinholt
2017-11-22
Raphaël Nussbaumer
2021-4-21
Look like the second method is not working anymore with R2020b at least...
For instance
tmp = NaT(1,2)
tmp(1)=duration(0,0,1)
returns:
Error using datetime/parenAssign (line 66)
Right hand side of an assignment must be a datetime array or text representing dates and times.
tmp is a datetime array. The output of duration is a duration array.
What do you expect to occur when you allocate a duration to a datetime array? What date is "five minutes" ?
"Look like the second method is not working anymore with R2020b at least... "
It works when I try it:
X = NaT(2,3)-NaT(1)
更多回答（2 个）
Jan
2017-11-21
I asssume that https://www.mathworks.com/help/matlab/ref/nat.html: "Not-a-Time" does not help directly. What about:
duration(NaN(size));
1 个评论
Karol Ondrejkovic
2022-6-17
For me duration(strings(size)) works well.
Example:
duration(strings([2,3]))
Another way to create an empty array of duration objects is to use the empty function for the class.
d = duration.empty(5, 0)
2 个评论
Raphaël Nussbaumer
2021-4-21
Nice one! Much better. It would be nice to be able to do:
duration.empty(size(X))
with X another matrix od any size.
Thanks anyway!
As long as X is empty you can.
X = zeros(1, 2, 3, 4, 0);
D = duration.empty(size(X));
size(D)
An empty array in MATLAB must have the size in at least one dimension equal to 0 (as per the documentation for the isempty function) so something like this wouldn't work as the error message clearly states.
X = 1:10;
D = duration.empty(size(X))
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