Please help: calculate average frequency of histogram

Hello everyone,

I hope anyone could help me, I'm kinda new to Matlab.

I have two variables, speed and time. I would like to calculate mean duration of each speed interval.

For example:

In Speed interval between 2-4 mph (shown in yellow color), i have 4 speed data. The first data was last for 1-sec only, and the others were last for 3 sec. The mean duration of speed stability is 2 sec.

I really appreciate any help you give.

Thank you for your time.

[George Papazafeiropoulos]

Could you write down the calculation you want to make in detail?

Answer 1

[Andrei Bobrov]

Sp=[3 9 1 2 3 2.5 7.8 6.5 9.3 9.1]';

[n,b] = histc(Sp,0:2:10);
c = accumarray(b,(1:numel(Sp))',[],@(x){x});
ii = cellfun(@(z)numel(unique(diff(sort(z)))),c);
ii(~ii) = 1;
out = n(1:end-1)./ii;

[llrb]

Hi Andrei,

Thank you very much. I was trying to use accumarray function as well but kinda stuck there. My function was "c=accumarray(b,Sp,[],@...)"

Would you mind to explain what does @(x){x} means? or maybe there's a link of fun index that i can use in the future? thanks

[Andrei Bobrov]

Please read about function accumarray