Learn calculus and applied mathematics using the Symbolic Math Toolbox™. The example shows introductory functions
To manipulate a symbolic variable, create an object of type
Once a symbolic variable is defined, you can build and visualize functions with
f(x) = 1/(5+4*cos(x))
Evaluate the function at using math notation.
Many functions can work with symbolic variables. For example,
diff differentiates a function.
f1 = diff(f)
diff can also find the derivative. Here is the second derivative.
f2 = diff(f,2)
int integrates functions of symbolic variables. The following is an attempt to retrieve the original function by integrating the second derivative twice.
g = int(int(f2))
At first glance, the plots for and look the same. Look carefully, however, at their formulas and their ranges on the y-axis.
subplot(1,2,1) fplot(f) subplot(1,2,2) fplot(g)
is the difference between and . It has a complicated formula, but its graph looks like a constant.
e = f - g
To show that the difference really is a constant, simplify the equation. This confirms that the difference between them really is a constant.
e = simplify(e)