How can the data point, where values start to increase for the first time in a data, be found, as this increase continues at the following 30 values?

Hi,

I have 1*1630 data. I want to find the first data point where the values in this data start to increase. However, to accept this as the value I am looking for, this increase should continue in the next 30 values after the first increase.

How do I find this data point? Can you help me with that, please?

Regards

Answer 1

[Matt J]

This uses the File Exchange contributions groupTrue and groupFcn (Download):

G=groupTrue( diff(data)>0 );

g=find(  groupFcn(@numel,G,G)>=30 , 1);

if isempty(g), error 'No increasing region of length 30 found'; end

start=find( G==g , 1)

[Canan Yuksel]

Many thanks for this reply, Matt. However, I am taking a notification saying 'Unrecognized function or variable 'groupTrue''. I am novice in Matlab and I could not find where the problem is. Can you advise me anything about that?

Thanks

[Matt J]

That is almost certainly because you did not download it from the Download link that I gave you.

[Canan Yuksel]

Okay, thanks, Matt.