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From: Richard Wylde on 23 Jun 2010 06:02
Hi there,

I'm somewhat new to matlab (and in general, programming) and therefore require some help.


I have a data set of temperatures over a 5 minute interval. I wish to average these temperatures over a 30 minute interval instead. I therefore know that I need to add up each 6 entries, and then divide by 6. I need to repeat this process every 6 entries until I have completed the process for the entire data set. Once this is done, I then want to put the new averaged data into a new array.

For example, say I have the following (representing 60 minutes of data):

1
2
6
2
1
4
6
2
6
8
5
2

I wish to turn it into the following:

2.6
4.8



How would I go about this? Any help would be hugely appreciated.

Richard.
From: us on 23 Jun 2010 06:11
"Richard Wylde" <rwylde(a)gmail.com> wrote in message <hvsm2u$p35$1(a)fred.mathworks.com>...
> Hi there,
>
> I'm somewhat new to matlab (and in general, programming) and therefore require some help.
>
>
> I have a data set of temperatures over a 5 minute interval. I wish to average these temperatures over a 30 minute interval instead. I therefore know that I need to add up each 6 entries, and then divide by 6. I need to repeat this process every 6 entries until I have completed the process for the entire data set. Once this is done, I then want to put the new averaged data into a new array.
>
> For example, say I have the following (representing 60 minutes of data):
>
> 1
> 2
> 6
> 2
> 1
> 4
> 6
> 2
> 6
> 8
> 5
> 2
>
> I wish to turn it into the following:
>
> 2.6
> 4.8
>
>
>
> How would I go about this? Any help would be hugely appreciated.
>
> Richard.

one of the solutions

v=[1 2 6 2 1 4 6 2 6 8 5 2].';
r=mean(reshape(v,[],2))
% r = 2.6667 4.8333

us
From: Oleg Komarov on 23 Jun 2010 06:14
"Richard Wylde" <rwylde(a)gmail.com> wrote in message <hvsm2u$p35$1(a)fred.mathworks.com>...
> Hi there,
>
> I'm somewhat new to matlab (and in general, programming) and therefore require some help.
>
>
> I have a data set of temperatures over a 5 minute interval. I wish to average these temperatures over a 30 minute interval instead. I therefore know that I need to add up each 6 entries, and then divide by 6. I need to repeat this process every 6 entries until I have completed the process for the entire data set. Once this is done, I then want to put the new averaged data into a new array.
>
> For example, say I have the following (representing 60 minutes of data):
>
> 1
> 2
> 6
> 2
> 1
> 4
> 6
> 2
> 6
> 8
> 5
> 2
>
> I wish to turn it into the following:
>
> 2.6
> 4.8
>
>
>
> How would I go about this? Any help would be hugely appreciated.

temp = [1
2
6
2
1
4
6
2
6
8
5
2];

mean(reshape(temp, 6,[]))

this solution works only if rem(numel(temp),6) == 0, that is if the number of elements is divisible by 6 with no remainder.
If it is not just add up som Nan at the end and instead of mean, use nanmean (Stats TB)

Oleg
From: Richard Wylde on 23 Jun 2010 06:30
Thanks for both of the answers, that worked perfectly. I appreciate the speed of the replies.

Richard.
From: ImageAnalyst on 23 Jun 2010 07:06
Richard:
An alternative method that you may find handy sometime is
blockproc(). With that you can also use a much more complicated
function than a simple average.

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