Scatter plot with two data sets of uneven values

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Vince Clementi
Vince Clementi 2020-1-10
评论： Adam Danz 2020-1-10
Hi All,
Is it possible to create a scatter plot using two datasets of uneven values. For example, D1 and D1 both have x values that span 0 120 and y values of different parameters (D1 = oxygen, D2 = chlorine). However, D1 consists of 80 data points, and D2 consists of ~20. Moreover, the x values for D1 and D2 do not overlap.
If not, is there a recommended solution to make this easier? The only thing I can think of is to resample the data to a common axis, but that introduces data that are not real.
Thanks!
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Vince Clementi
Vince Clementi 2020-1-10
I expect a fairly linear relationship between the variables. Option 2 sounds reasonable, but it would be best to mitigate any spruious data.
Adam Danz
Adam Danz 2020-1-10
"Option 2 sounds reasonable"
It sounds like this decision hasn't been though out. The results will not be meaningful unless the pairing is meaningful. There are lots of ways to pair the two datasets and each of them will produce a very different result with a different interpretation.

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Adam Danz
Adam Danz 2020-1-10
编辑：Adam Danz 2020-1-10
Here's a demo you can follow.
It produces 2 datasets per your description; then it pairs the y values from dataset1 to dataset 2 according to proximity of the x values.
Then in plots the results. The data are random so don't expect linearity.
% Produce 2 datasets, one longer than the other; x values range from 0:110
dataset1 = [rand(100,1)*110, rand(100,1)];
dataset2 = [rand(50,1)*110, rand(50,1)*10];
% Find the rows of dataset1 that is closest to the
% x values in dataset 2
D = pdist2(dataset1,dataset2); % distance between each (x,y)
% D = pdist2(dataset1(:,1),dataset2(:,1)); % distance between each (x)
[~, minRow] = min(D);
% Plot results
plot(dataset1(minRow,2), dataset2(:,2),'o')
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Vince Clementi
Vince Clementi 2020-1-10
Great modification that strengthens the method. Thank you.

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