# Thread Subject: NaN for time series collection

 Subject: NaN for time series collection From: Mads Date: 31 May, 2012 08:05:13 Message: 1 of 6 Hi, I have a time series collection with 57 periods and i want to resample to 60 periods instead. For the last 3 periods where i have no data i want the data points to be zero. As default they become NaN, is there a way to do this? Thx
 Subject: NaN for time series collection From: Ben Date: 31 May, 2012 14:40:11 Message: 2 of 6 "Mads" wrote in message ... > Hi, > > I have a time series collection with 57 periods and i want to resample to 60 periods instead. For the last 3 periods where i have no data i want the data points to be zero. As default they become NaN, is there a way to do this? > > Thx try looking at the isnan function. (I also use logical indexing in this example, so that would be another googleable term for you to look into.) %Setting up a test array >>a = [1:60]; >>a(58:60)=NaN; %Change the last three to be NaNs %Change all the NaNs in the data to be equal to zero >>a(isnan(a))=0;
 Subject: NaN for time series collection From: Mads Date: 31 May, 2012 14:52:07 Message: 3 of 6 Thank you for helping. You misunderstand my problem, though. I have a collection of timeseries which are organized as a matlab timeseries collection (tscollection function). I want to apply an isnan-type function to this whole collection of time series. "Ben" wrote in message ... > "Mads" wrote in message ... > > Hi, > > > > I have a time series collection with 57 periods and i want to resample to 60 periods instead. For the last 3 periods where i have no data i want the data points to be zero. As default they become NaN, is there a way to do this? > > > > Thx > > try looking at the isnan function. (I also use logical indexing in this example, so that would be another googleable term for you to look into.) > > %Setting up a test array > >>a = [1:60]; > >>a(58:60)=NaN; %Change the last three to be NaNs > > %Change all the NaNs in the data to be equal to zero > >>a(isnan(a))=0;
 Subject: NaN for time series collection From: Ben Date: 31 May, 2012 15:07:07 Message: 4 of 6 "Mads" wrote in message ... > Thank you for helping. You misunderstand my problem, though. > > I have a collection of timeseries which are organized as a matlab timeseries collection (tscollection function). I want to apply an isnan-type function to this whole collection of time series. I haven't used tscollection before, but it just looks like a specific structure format -- right? So why won't isnan work for you by looping through the fields of the structure?
 Subject: NaN for time series collection From: Mads Date: 31 May, 2012 15:30:17 Message: 5 of 6 It will and thats what i have done. But the timeseries collection object has a bunch of functions attached which operate on all timeseries in the collection, so i thought maybe someone would know how to use a tscollection operator to do this. "Ben" wrote in message ... > "Mads" wrote in message ... > > Thank you for helping. You misunderstand my problem, though. > > > > I have a collection of timeseries which are organized as a matlab timeseries collection (tscollection function). I want to apply an isnan-type function to this whole collection of time series. > > I haven't used tscollection before, but it just looks like a specific structure format -- right? So why won't isnan work for you by looping through the fields of the structure?
 Subject: NaN for time series collection From: Ben Date: 31 May, 2012 15:54:07 Message: 6 of 6 "Mads" wrote in message ... > It will and thats what i have done. But the timeseries collection object has a bunch of functions attached which operate on all timeseries in the collection, so i thought maybe someone would know how to use a tscollection operator to do this. > Hmm... well, if it works, don't break it! Although, there are a few reasons I can come up with for why you'd want to do this: 1) you're unsatisfied with the speed of your implementation, 2) you want your code to be cleaner or 3) you want to learn a new function. But since I haven't used timeseries before, I can't help. You could look at one of the other tools that Mathworks has written for you and take a crack at writing one of your own... Good luck.

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