What is the Horizontal axis represent in R value figure in the ANN fitting?

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I am using the fitting app in Matlab ANN (nnstart), but I am confused about the R value figure generated by the tool after traing. What is the Horizontal axis represent in R value figure in the ANN fitting? For example, the attached figure is R value of a ''body fat'' training example. Why the x-axis range is 0-40 or 0-50? It is not the sample number? How does the x-axis (Target) is obtained? Could anyone help me? Thanks.

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Aditya Patil
Aditya Patil 2021년 5월 17일
The plot shown is created using plotregression function. It shows relation between the targets on the y axis, and the predicted output on the y axis. the axis limits are based on the limits of these two values. See the following code for example.
targets = randi(100, [1 100]); % expected output
outputs = targets + randi(10, [1 100]); % predicted output
plotregression(targets,outputs)
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Aditya Patil
Aditya Patil 2021년 5월 21일
With multiple outputs, you should plot independent plot for each output-target pair. A combined plot simply takes all the values, which won't be meaningful. For example, if one output is age and another output is weight, it doesn't make sense to plot age and weight on the same axis, and fit a regression to it.
Sunny
Sunny 2021년 5월 21일
That makes sense. Thank you Aditya.

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