Sensing the data changes and plotting
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I have a table "a" which has multiple rows and 2 columns; t for time and q for data. I attached here.
I want to plots the period only where the sudden change of value happens (from start to end of the changes) such as I showed in figure where the value jumped from nearly -4 to -43.65.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1171818/image.png)
After that I'd like to generate a table of the data of the plot. There will be many periods where such kind of data changes occurs so I want to plot everytime with that data changes.
load = 'newdata3.csv';
data = readtable(load);
data = sortrows(data,'Var1','ascend');
timetable(data.Var1, data.Var2);
plot(data.Var1,data.Var2)
findchangepts(data.Var2,'MaxNumChanges',20)
Here, I tried and it is not showing at the correct changes points. There are 12 changes points and it is only showing 5 of them. I don't know how to fix this.
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Image Analyst
le 27 Oct 2022
Do you have the Image Processing Toolbox? If so, it's easy.
v = a.V;
mask = v > 200
props = regionprops(mask, 'PixelIdxList');
numRegions = numel(props);
coords = vertcat(props.PixelIdxList);
startingRows = coords(:, 2);
or something similar. It would have been easier if you had read the posting guidelines and remembered to attach your data.
To learn other fundamental concepts, invest 2 hours of your time here:
If you have any more questions, then attach your data and code to read it in with the paperclip icon after you read this:
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Image Analyst
le 1 Nov 2022
Yes. But I don't know what you want.
If you have any more questions, then attach your data and code to read it in with the paperclip icon after you read this:
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