Compute error between two graphs, each graph contains point data forming multiple curves.

2023 1 8
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更新时间：2023 1 20
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I have a experimental x-y data which forms multiple intersecting and non-intersecting curves. I then have another x-y data which comes from simulation containing similar x-y data. How to I compute the error between those two graph. In the end, I want to match the experimental x-y data with the simulation x-y data.

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Matt J
Matt J 2023-1-8
编辑：Matt J 2023-1-8
Are the number of data points in each set of (x,y) data the same? Do the x-coordinate data match for all data sets?
Cardim
Cardim 2023-1-19
No, the datasets are different. Each dataset when plotted looks like multiple overlapping curves. What I want to know is if I have two different dataset, how close are they to each other, or in other words, do they match with each other. The trend should match, one dataset can have sparse points as compared to other.
Cardim
Cardim 2023-1-19
Here is the example of two sample data set I want to correlate.
Cardim
Cardim 2023-1-19
FYI: The data cannot be upsampled or downsampled as the dataset length varies for eah dataset
Matt J
Matt J 2023-1-20
Very well, then please comment on one or both of the answers below.

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回答（2 个）

Ran in:

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Ran in:
There are a few ways to do it.
x=linspace(0, 2*pi);
f = 3.5*sin(2*x); % Fit model
y = f+randn(size(x)); % Experimental data
scatter(x,y), hold on
plot(x,f, 'k-'), grid on
df = abs(f)-abs(y); % The difference (Error)
figure
plot(1:numel(x), df)
title('Error')
ylabel('Error')
xlabel('Data orders')
grid on

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Cardim
Cardim
2023-1-8

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Matt J
Matt J
2023-1-20

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