Create a vector in 15-minute intervals (from 0 am to 24 pm)

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Renan Santos
Renan Santos am 13 Jun. 2021
Bearbeitet: Walter Roberson am 19 Jun. 2021
Hi everyone!
I need to create a bar graph with the x axis in 15-minute intervals (from 0 am to 24 pm). Can someone help me to create a vector to do this with HH:MM on the plot?

Antworten (1)

Walter Roberson
Walter Roberson am 13 Jun. 2021
Bearbeitet: Walter Roberson am 13 Jun. 2021
Sure, you can xticks() with datetime objects if you have a datetime ruler.
The problem is being able to read it. Every 15 minutes for a day is 96 ticks.
Though for your purposes, perhaps just leaving out the xticks() call on this example would be enough for your purposes.
BT = datetime('yesterday')
BT = datetime
12-Jun-2021
T = BT + minutes(sort(1440*rand(1, 500)));
T(1:10)
ans = 1×10 datetime array
12-Jun-2021 00:03:05 12-Jun-2021 00:03:54 12-Jun-2021 00:03:56 12-Jun-2021 00:04:57 12-Jun-2021 00:07:07 12-Jun-2021 00:15:35 12-Jun-2021 00:23:47 12-Jun-2021 00:23:58 12-Jun-2021 00:24:00 12-Jun-2021 00:27:15
V = rand(size(T))
V = 1×500
0.9208 0.8995 0.6975 0.5460 0.2480 0.6074 0.6270 0.5911 0.8992 0.7790 0.8939 0.5660 0.9413 0.7454 0.2384 0.5734 0.3513 0.5612 0.8775 0.7663 0.3734 0.7775 0.0866 0.8703 0.9714 0.2642 0.8139 0.0315 0.7880 0.0938
ticks = BT + minutes(0:15:1440);
Vdis = accumarray(discretize(T(:), ticks), V(:), [length(ticks),1]);
bar(ticks, Vdis)
xticks(ticks)
  4 Kommentare
Renan Santos
Renan Santos am 19 Jun. 2021
Thanks for all, but I'd like to know if there is any way to do it running in MATLAB 2014 R2014a.
In this version doesn't have functions like minutes, datetime, etc.
Walter Roberson
Walter Roberson am 19 Jun. 2021
Bearbeitet: Walter Roberson am 19 Jun. 2021
as_minutes = 0:15:(24*60)-1;
as_days = as_minutes ./ (24*60);
y = rand(size(as_days)); %something to plot
plot(as_days, y);
datetick('x', 'HH:MM')

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