calculating max value of each interval in a data and apply loop for each interval.

hello. i have a column of 18200 values. i want to divide it into interval of 10 elements each. and then calculate the max value of each interval. but, when i want to calculate the max value of 2nd interval, i want to consider all values from the previous interval. and then calculate the max value of 1st 20 elements.i want to do the same to the rest of the intervals. please help me how can i apply such a loop? thank u.

Answer 1

[Aditya Salveru]

Hi sud,

You can do this by by finding the max of 1-10,1-20,1-30....elements. The code for the same is as follows:

k=randi(500,18200,1);
n=1:10:length(k); % n becomes [1,10,20,...18200]
maximum=[];
for i=1:length(n)
    maximum(i)=max(k(1:n(i))); % i'th element of maximum would be the max upto i'th interval of k.
end
maximum

I have taken array k to be 18200 random values you can change it as you want.

Hope this helps.

[sud]

hi aditya, it was very helpful. thanks. but 1. the 1st element i am getting is not the max value of 1st 10 elements. its starting to give me correct max values from the 2nd element. 2. also i want to put this max values in a column and plot it with i (10,20,30) your help is much appreciated

[sud]

also i want i to go from 1 to 4000 and not the whole length of k

[sud]

thanks a lot. its done.

Answer 2

[KSSV]

YOu can use reshape to divide into intervals..and then use max. Read about reshape and max

[sud]

thanks but reshape is not really useful for what i want to do.