Process function at iterated linear indices

I'm trying to create a for loop that will calculate avg = mean(var(n:(n+500))) for all values of n. What I mean by that is that I want to average over the range from n to n+500 for each value of n, so if n has 500 values, I want to average over 500 different ranges. Mean is the function, var is a variable loaded to the workspace, and n is the linear index of values of the variable. I'm a pretty beginner-level matlab user and have almost no experience with looping, hence the difficulties.

Here's the code I have created, which yields only a single value for avg (the result for n=1):

load data.mat
[peaks, locs] = findpeaks(data1);
locs1 = locs-400;  
locs2 = locs+400;

for locs = locs(1:end);
avg1 = mean(abs(data1(locs_minus:locs)));
avg2 = mean(abs(data1(locs:locs_plus)));
end

Any advice would be greatly appreciated. It seems like a very simple problem that I'm just too ignorant of matlab to figure out.

Answer 1

[Fangjun Jiang]

avg1 and avg2 are over-written every time inside the loop.

outside of the for-loop, initialize avg1 and avg2 first:

avg1=zeros(size(locs));
avg2=zeros(size(locs));

Inside the for-loop, use

for k= 1:length(locs);
  avg1(k) = mean(abs(data1(locs_minus:locs(k))));
  avg2(k) = mean(abs(data1(locs(k):locs_plus)));
end

[Sarah]

Awesome! I tried something amazingly close to this, but the devil's really in the details. Thanks so much!