Creating histogram from a datetime vector
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Hello guys!
I was trying to plot a datetime arrangement (vector) in a 12-hour histogram.
The problem is that when I try to plot it, it considers the whole date (since each element has a dd-MM-yy HH:mm:ss format), so I was wondering if is possible to isolate the hour in order to get an histogram that shows the hourly frecuency in a single day (only considering the hour). Another option I was considering is transforming the HH element into another data type easier to plot, but once again, I am not sure how to do it.
Thank you in advance,
Carlos.
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Star Strider
2020-12-30
I am not certain what your data are or the actual result you want.
Try this:
DT = datetime('now')+hours(0:72).'; % Create ‘datetime’ Array
T1 = table(DT, rand(size(DT))); % Create Table With Data
[UCol1,~,ix] = unique(mod(hour(T1{:,1}),12)); % Unique Values & Indices
Tally = accumarray(ix, T1{:,2}); % Counts
figure
bar(UCol1, Tally)
grid
.
更多回答（1 个）
rightNow = datetime('now')
howLongSinceMidnight = timeofday(rightNow)
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