MATLAB: Process function at iterated linear indices

for loopiterationlinear 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.

Best Answer

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
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