Have you tried searching and browsing the MathWorks documentation? It seems like linspace could be used effectively here...
I think more generally, you just need to think logically about what you want done and then tell the computer to do it step by step. For example, thinking about what you say, I come up with the following script:
x = 1:100;
y = cos(x);
plot(x,y)
NoData = length(y);
NoSections = 5;
DataPerSection = NoData / NoSections;
result = zeros(1,NoSections);
counter = 1;
for loop = 1:NoSections
result(loop) = mean(y(counter:counter+DataPerSection-1));
counter = counter + DataPerSection; % advance to next chunk
end
Then you can just change the number of sections, NoSections to some number ... but you'd need to be careful that it divides the data into an integer or the for loop will have an error.
