How the error value appears in the graph?

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Momo
Momo 2018-3-7
评论： Momo 2018-3-8
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);
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Rik
Rik 2018-3-7
What is the code that you are using and how exactly to do want the error to be shown?

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Walter Roberson
Walter Roberson 2018-3-7
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.
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Walter Roberson
Walter Roberson 2018-3-8
ax = gca;
ax.YAxis.Exponent = 0;
this would disable using the exponent on the Y axis.
If you use a value other than 0 then that exponent will be used; for example you can use a value of -1 or 1.
However, if you want 10^0 to be specifically marked then you have to use an exponent of 0 and then text() the 10^0 into place.

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