How to write code for this?

Dear All,

I want to plot ROTI. Would you please help me? The ROTI is defined as the standard deviation of ROT, given by (<ROT^2> - <ROT>^2)^1/2 for each 5-min interval.

Answer 1

[KSSV]

x = rand(100,1) ;
y = sqrt(mean(x.^2)-mean(x)^2) 

y = 0.2657

[KSSV]

@Ara comment moved here:

Thank you for you reply.

How to calculate standard deviation for each 5 min interval?

y=std(sqrt(mean(x.^2)-mean(x)^2));

Is that correct

[KSSV]

You see, (sqrt(mean(x.^2)-mean(x)^2) is a single number, you cannot find stanard deviation. May be you need to find this number for every five minutes ata and then get Std of that array.

[Ara]

I think you are right. I have a column of time. How to write for every 5 min data and then get the std?

[Stephen Tete]

Kindly check the code again that is not how to calculate ROI