Adding NaN values in a for loop

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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];
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
list = [list y1];
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?

Accepted Answer

KSSV on 22 Jun 2020
May be your should add
if isempty(y1)
y1 = NaN;

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