How can I add a trendline to a scattergraph of multiple data sets?

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Lala0099
Lala0099 2019-11-6
评论： Star Strider 2024-2-6
Hey Everyone,
I have uploaded my code and a data set that I am trying to process.
So I created a code that works well enough for my purposes. The trouble that I am having is that I need a scatter graph, with all the points that i included in the plotting section. But i also need a trendline for each plot within that one graph. And I need to find the gradient of the trendline for each data set and store it in a variable.
I tried to use, this command, but i am not sure if it the same as a trendline in excel and also cannot get the gradient for this. I would appreciate any help!!
lsline

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Star Strider
Star Strider 2019-11-6
The lsline function needs a bit of help to give up its secrets.
Try this:
figure
scatter(rand(1,10), rand(1,10))
hold on
scatter(rand(1,20), rand(1,20))
hold off
h = lsline;
for k = 1:numel(h)
B = polyfit(h(k).XData, h(k).YData,1);
slope(k) = B(1);
intercept(k) = B(2);
end
Experiment with your own data and plots to get the result you want.
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Sena
Sena 2024-2-6
Hello, I wanted to do the same thing and used your code.
How to I tweak this code so it is using my data points? Everytime I try to add it into the line, B = polyfit(h(k).XData, h(k).YData,1); with dot indexing it does not work, it gives me this error:
Unrecognized method,
property, or field
'VariableName' for class
'matlab.graphics.primitive.Line'.
Star Strider
Star Strider 2024-2-6
@Sena — I would have to know more about your particular problem. I just tested it again using R2023b and it still works.

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