Calculate Standard Deviation on a Certain X Point

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Hi!
So now I have obtained a linear fit according to scatter plots of 10 data sets with different sizes. The data sets consists of millions of displacement data on fixed force value, in the multiples of 9.81. Now I want to calculate the standard deviation of displacement value on each force value, namely 9.81,19.62 etc...Is there any way to do it fast in Matlab?
I have attached my code here too.
  2 Comments
Huichen Zhang
Huichen Zhang on 29 Mar 2017
Yes it will be much better if the force values can be classified to groups. I want to group the displacement value with force input of 9.81 together, displacement value with force input of 19.62 together etc. However, now a dataset now consists of displacement with force inputs of 9.81,19.62...., and a total dataset, which is simply merging all data sets together, consists of displacement with force inputs of 9.81,19.62...;then again 9.81,19.82...;then again 9.81,19.62...; is there any fast way to group?

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