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POMATLAB: n-minute/hour/day averages of a time-series
 

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    <p>This is a follow-up to an earlier question of mine posted <a href="https://stackoverflow.com/questions/17032033/matlab-averaging-time-series-data-without-loops">here</a>. Based on Oleg Komarov's answer I wrote a little tool to get daily, hourly, etc. averages or sums of my data that uses accumarray() and datevec()'s output structure. Feel free to have a look at it <a href="http://pastebin.com/gkTyShZM" rel="nofollow noreferrer">here</a> (it's probably not written very well, but it works for me).</p> <p>What I would like to do now is add the functionality to calculate n-minute, n-hour, n-day, etc. statistics instead of 1-minute, 1-hour, 1-day, etc. like my function does. I have a rough idea that simply loops over my time-vector t (which would be pretty much what I would have done already if I hadn't learnt about the beautiful accumarray()), but that means I have to do a lot of error-checking for data gaps, uneven sampling times, etc.</p> <p>I wonder if there is a more elegant/efficient approach that lets me re-use/extend my old function posted above, i.e. something that still makes use of accumarray() and datevec(), since this makes working with gaps very easy.</p> <p>You can download some sample data taken from my last question <a href="https://dl.dropboxusercontent.com/u/9437411/sampledata_ts.mat" rel="nofollow noreferrer">here</a>. These were sampled at 30 min intervals, so a possible example of what I want to do would be to calculate 6 hour averages <em>without</em> relying on the assumption that they are free of gaps and/or always sampled at exactly 30 min.</p> <hr> <p>This is what I have come up with so far, which works reasonably well, apart from a small but easily fixed problem with the time stamps (e.g. 0:30 is representative for the interval from 0:30 to 0:45 -- my old function suffers from the same problem, though):</p> <p>[ ... see my answer below ...]</p> <p>Thanks to <a href="https://stackoverflow.com/questions/2323031/matlab-compute-mean-of-each-1-minute-interval-of-a-time-series">woodchips</a> for inspiration.</p>
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