How to calculate each consecutive 2data standard deviation

2017 11 19
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更新时间：2017 11 19
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Hi,
I have the below data:
0.12 0.235 0.362
0.125 0.254 0.362
0.131 0.254 0.356
0.235 0.254 0.563
0.326 0.258 0.635
0.362 0.562 0.635
0.362 0.562 0.635
0.523 0.568 0.725
0.555 0.598 0.789
0.555 0.598 0.568
0.555 0.598 0.568
0.555 0.598 0.568
0.555 0.598 0.568
0.555 0.598 0.568
0.555 0.598 0.568
0.555 0.598 0.568
Want to calcaulate STD of each two consecutive data by column.
Kindly help someone, many thanks in advance,

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回答（1 个）

Walter Roberson
Walter Roberson 2017-11-19

0 个投票

reshape( std(reshape(YourData, 2, size(YourData,1)/2, size(YourData,2))), [], size(YourData,2))
or
abs(YourData(1:2:end,:) - YourData(2:2:end,:))/sqrt(2)
The second of these works because the standard deviation between exactly two values X and Y is abs(X-Y)/sqrt(2)

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Mekala balaji
Mekala balaji 2017-11-19
Thanks Sir, But I just wonder will it work for the odd data size(size is 21, not divisible by 2)
Walter Roberson
Walter Roberson 2017-11-19
You have not defined the result that you want for the isolated row.

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