calculation of time series.
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I have monthly (420 months) time series data of temperature . I need to calculate a another time series based on following formula:
x = T(month,i) - T(month,i-1)
where, T(month,i) is temperature of current month
T(month,i-1) is temperature of previous month
how to create a time series of x ?
回答（3 个）
diffdata = diff(ts.Data)
difftime = ts.Time(1:end-1)+diff(ts.Time)/2;
tsdiff = timeseries(diffdata, difftime)
Image Analyst
2015-11-6
If the second index is the month number, what does the first index represent? Have you tried
x = diff(T(month,:))?
2 个评论
SONI SONI
2015-11-6
Image Analyst
2015-11-6
But originally you said T was a 2-D array - it had two indexes: for a row and a column. Now you're saying T is a 1D array taking only one index. Totally inconsistent. Which is it?????
SONI SONI
2015-11-9
0 个投票
2 个评论
Image Analyst
2015-11-9
Now you're back to a 1-D array, NOT a 2-D array despite what you say, because it has only 1 index.
And your code just does diff() which is the same as what I gave you except in a function instead of a for loop.
I give up.
SONI SONI
2015-11-9
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