MATLAB: Not overwriting array in if-elseif loop

for loopif loop

Hi,
I have the following code
        for k = 1:length(yarray)-1
            if yarray(k+1) <= A & yarray(k) >= A
        M = [yarray(k) yarray(k+1) k k+1]
            elseif yarray(k+1) >= A & yarray(k) <= A
        M = [yarray(k) yarray(k+1) k k+1]
            end
        end
Where yarray is an array of y values in a plot, and A is the y value that I want to find corresponding x values to. I am expecting the if and elseif conditions to be satisfied 4 times, resulting in 4 M arrays. However, each time this is satisfied, M is overwritten. How can I come up with 4 different arrays which I can recall later?Let me know if this needs more clarification. Thanks!

Best Answer

Preallocate M before the loop and index it inside the loop:
M = zeros(length(yarray)-1,4);
for...
M(k,:) = 
end
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