How to find the difference between non-consecutive values

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Joy
Joy 2024-4-1
编辑： Voss 2024-4-1
How do I use diff() to find the difference between a certain number of indices? Furthermore, how do I turn the datetime into seconds to find the rate of X over time.
e.g., I have a datetime array t and another array X. I want to find the difference between every two elements of X and find the rate.
t1 = datetime(2013,11,1,8,0,0);
t2 = datetime(2013,11,5,8,0,0);
t = t1:t2
X = 1:5:25
for i = 1:2:length(X)
A = diff(X(i))/diff(seconds(t(i)))
end
However, I get an empty array in A.

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采纳的回答

Voss
Voss 2024-4-1
编辑：Voss 2024-4-1
Ran in:
t1 = datetime(2013,11,1,8,0,0);
t2 = datetime(2013,11,5,8,0,0);
t = t1:t2
t = 1x5 datetime array
01-Nov-2013 08:00:00 02-Nov-2013 08:00:00 03-Nov-2013 08:00:00 04-Nov-2013 08:00:00 05-Nov-2013 08:00:00
X = 1:5:25
X = 1x5
1 6 11 16 21
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A = diff(X(1:2:end))./seconds(diff(t(1:2:end)))
A = 1x2
1.0e-04 * 0.5787 0.5787
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