
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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Accepted Answer
Aditya Patil
on 17 May 2021
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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