Difficulty in understanding Dynamic time warping plots

I have two signals, which I am trying to compare. Data 1 ranges from 0 to 15 seconds. Data 2 ranges from 0 to 12 seconds.

I have used dtw function and result can be seen in figure. From that figure I don't understand what is the x axis here. I suppose it is time in milli seconds, but then how did my data that ran for 0 to 15 and 12 seconds end up at 950 ms. Also in the figure, the original signal shows a much shorter x axis.

Answer 1

[Image Analyst]

The x axis is in elements or indexes. If you want it in millseconds you have to create an x vector and use it in plot

x1 = linspace(0, 15, numel(Data1));
x2 = linspace(0, 12, numel(Data2));
plot(x1, Data1, 'b-', 'LineWidth', 2);
hold on;
grid on;
plot(x2, Data2, 'r-', 'LineWidth', 2);