determine the points where cancellation occurs in matlab

To determine the points where cancellation occurs in Matlab, you need to analyze your data and detect the points where the signs change. Here's a simple way to do it:

1. Load your data into Matlab using the load function.
2. Compute the sign of the data using the sign function, which returns -1, 0 or 1 depending on the sign of the input.
3. Compute the difference between consecutive elements of the sign vector using the diff function.
4. Find the indices of the non-zero elements using the find function.

Here's the code to implement these steps:

main.m
% Load data from file
data = load('data.txt');

% Compute sign of the data
s = sign(data);

% Find points where the signs change
idx = find(diff(s)~=0);
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The idx vector contains the indices of the points where the signs of the data change, i.e. where cancellation occurs.