MATLAB: Adding NaN values in a for loop

Question

I have a table of measurements and the corresponding depth where the measurements were taken. I'm trying to graph the depth where the difference between two adjacent measurements is larger than a certain value (ex, 1) for the first time (See this question). I find this depth using

list = [];
for t = 1:size(data,1)
    y1 = data.depth(find(abs(diff(data(t,:)))>1,1)+1);
    list = [list y1];
end

Since my objective is to graph this, I need the list be the same size at data. However, if there is no difference that is greater than one, it does not add anything to the list. This changes the size of list. I tried including

list = [];
for t = 1:size(data,1)
    y1 = depth(find(abs(diff(data(t,:)))>1,1)+1);
    if y1 == 0
        y1 = nan
    end
    list = [list y1];
end

but this doesn't work because, if there is no adjacent difference is greater than 1, then y1 equals nothing, not zero.

How can I add NaN for every time there is no adjacent difference greater than 1?

Answer 1

May be your should add

if isempty(y1)
y1 = NaN;
end