How to create a vector?

How can I create a vector containing all the k values? Thank you!

beat_count=0;

for k=2:length(val)-1;

if(val(k)>val(k-1)&val(k)>val(k+1)&val(k)>1)

k

disp('Prominant peak found');

beat_count=beat_count+1;

end

end

Answer 1

[Kevin Phung]

v = [];
for k=2:length(val)-1;
    if(val(k)>val(k-1)&val(k)>val(k+1)&val(k)>1)
        k
        disp('Prominant peak found');
        beat_count=beat_count+1;
        v(end+1) = k % save k value into vector v;
    
    end
end

[Ioana Mateescuu]

Thank you!

[Stephen23]

https://www.mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html