MATLAB: How the error value appears in the graph

error

Hello, I am trying to plot the difference between two polynomials some of graphs I could not get the value of the error on it like the following graph.
so what I can do to make the value of the error appears in the graph?
Error=abs(p1-p2);

Best Answer

hold on
plot(x, Error, 'r')
where x is the name of the variable being used for the x axis.
Note that it is possible that the error is small enough that it would not be visible on the graph except as a (red) line against the bottom. For example if the error were about 1E-15 then it would only be 1/10000 the span of your y axes.
Related Question