You define an anonymous function of one variable. In the next line you define a second anonymous function and ask to fplot it. When invoked, the second anonymous function does a calculation and tries to add the first anonymous function to the result.
This fails because it is not permitted to do arithmetic on anonymous function handles.
Remember that the only operations permitted on anonymous functions are:
- displaying the anonymous function
- calling functions() to get some internal information about the anonymous function
- asking for the formula associated with the function (as text)
- asking for a text representation of the anonymous function
- storing the handle into a variable except one indexed using ()
- obscure exception: storing the handle to a non-existent variable indexed with (1)
- passing the handle as a parameter
- or invoking the anonymous function, which always requires () after the handle unless you use feval()
In no situation can you do something like
f = @(x)x*2
f + 5
as that is not one of the listed operations.
In your second anonymous function you are not invoking the first function: invoking would require passing a parameter to the first function.
