How to calculate each consecutive 2data standard deviation

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,

Answer 1

[Walter Roberson]

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)

[Mekala balaji]

Thanks Sir, But I just wonder will it work for the odd data size(size is 21, not divisible by 2)

[Walter Roberson]

You have not defined the result that you want for the isolated row.