Hi,
I have some data that I am collecting from some equipment. The data include x, y, and z values. x and y refer to the position and the z values are heights of the surface in micro meters. First three columns are x, y, and z. Last 3 columns are RGB codes (can be ignored now)
The data is attached. The y values change at constant intervals, and if you go to row 1860 you will notice that the y value changes. It will change at that same interval e.g. 1860, 3720. I am trying to write code that identifies at which row the y value changes. It will change multiple times in the data, and I want to identify at each point where it changes by telling the user "The y values are changing at 1860, 3720, etc".
The reason I need this to be flexible is that this piece of code should handle any data thrown at it (obviously in a similar format). So whether the y values change at 1860, 2000, 5, or whatever number, the user is informed of the positions.
I have tried using the code below:
filename = uigetfile("*.txt");
data = readtable(filename,"VariableNamingRule","preserve");
x_data = table2array(data(:,"Var1"));
y_data = table2array(data(:,"Var2"));
z_data = table2array(data(:,"Var3"));
numRows = size(y_data,1);
diffA = gradient(y_data);
Rows2Idx = zeros(length(y_data),1);
while diffA(1:numRows,:) ~= 0
msgbox(y_data(1,Rows2Idx))
As you can see, I tried an If statement and while loop, I've tried a lot of other different things but I would say I'm officially stuck now. Any help would be appreciated. I've also tried using the diff function to identify when the difference between points is not equal to zero, and use that to index, but I am struggling.
Apologies if this is a bit confusing, happy to answer any questions.
