How do I linearly resample data?

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Justin Berquist
Justin Berquist 2016-5-4
评论： Chad Greene 2016-5-4
I would like to linearly resample a matrix. For example if A = [0,0;5,10;10,20] I would like to resample it such that B = [0,0;1,2;2,4;3,6;4,8;5,10;6,12;7,14;8,16;9,18;10,20]
B =
0 0
1 2
2 4
3 6
4 8
5 10
6 12
7 14
8 16
9 18
10 20
I originally thought that this is what the resample function did, but upon further analysis I was wrong. Please keep in mind that I am doing this for large sensor files, files which contain data for weeks at 5 minute timesteps.
Thank you for any help

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回答（2 个）

Chad Greene
Chad Greene 2016-5-4
A = [0,0;5,10;10,20];
B(:,1) = 1:10;
B(:,2) = interp1(A(:,1),A(:,2),B(:,1),'linear')
B =
1.00 2.00
2.00 4.00
3.00 6.00
4.00 8.00
5.00 10.00
6.00 12.00
7.00 14.00
8.00 16.00
9.00 18.00
10.00 20.00
  2 个评论
Justin Berquist
Justin Berquist 2016-5-4
That was just an example, I need to do it for a scenario where A is a 2xn matrix and the values within are not known. How would I go about that?
Thank you

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Star Strider
Star Strider 2016-5-4
You can certainly use the resample function. You simply have to create a timeseries object from your data.
See my Answer to your previous Question in: http://www.mathworks.com/matlabcentral/answers/282548-how-can-i-resample-a-set-of-data
  3 个评论
显示 1更早的评论
Justin Berquist
Justin Berquist 2016-5-4
When i simply do A = resample(A,5,1) my data is not linearly aligned
Star Strider
Star Strider 2016-5-4
I would have to see your ‘Canal5208RadiatorT_out.csv’ file. If your data are regularly sampled (fixed sampling interval), linearly interpolating it is straightforward, using the linspace function, for instance, to generate the ‘query’ vector. If it’s not regularly-sampled, this becomes more difficult, because four points in every individual interval have to be created.

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