Hi, all! I have a array of monthly log returns from 1962 to 2016, I wish to extract the monthly values, every 12th value.

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Ola Sveen
Ola Sveen 2017-10-13
评论： KL 2017-10-17
Can andybody assist with this issue? How do I extract every 12th value?
Thanks!

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KL
KL 2017-10-13
编辑：KL 2017-10-13
data = 1:144; %sample data
data_mean = arrayfun(@(a,b) mean(data(a:b)),1:12:numel(data),12:12:numel(data))
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Ola Sveen
Ola Sveen 2017-10-16
KL, i´m sorry for the late reply. Many thanks for your assistance. The task have developed some, and we want to sum every 12th value like you prepose, du you know how this is done?

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Ola Sveen
Ola Sveen 2017-10-13
编辑：Ola Sveen 2017-10-13
Thx KL!
Now I would like to extract annual log returns from a dataset containing prices and dates. Do you know how to solve this? I have calculated the monthly log returns, how do I calculate the annual. I guess I need some sort of loop function, taken in consideration the formula for log return.
many thanks

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