Problem 733. Extract Built In Functions and Toolbox Functions from String or Function Handle

Created by Richard Zapor

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Find the Built-In functions and Toolbox functions in either a string or a function handle.

Generate a string of alphabetized Built-In functions followed by alphabetized Functions.

Inputs:

fh=@(x)log10(x)+log2(x)+abs(x)

str='smooth3(x,y)-filter(x)+abs(n)+filter2(u)+sin(x)+numel(z)'

Outputs:

'abs log2 log10'

'abs filter numel sin filter2 smooth3'

Related to Cody_464

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Last Solution submitted on Dec 15, 2025

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Venu Lolla on 6 Jun 2012

Richard: I believe there are a couple of inconsistencies in the test cases.

- You mention in the problem statement that the 'alphabetized built-in' functions should follow 'alphabetized' functions. However, 'log10' (not built-in) appears before 'log2' (built-in).

- 'i' is also a built-in function. 'which i' indicates that.

Venu Lolla on 6 Jun 2012

'i' in test case 2 is also 'built-in'

Aurelien Queffurust on 17 Jul 2012

I agree , exist('i') return 5 .

Richard Zapor on 18 Jul 2012

I changed hte "i" to "k".
Even though "i" was being used as a variable and not in its capacity as a built-in function.

Mayank Bajpai on 31 Oct 2020

In what order the names of the function are sorted?
(Thanks for the useful tags.)

Jakeb Chouinard on 9 Dec 2020

The functions are sorted alphabetically and by type.
Ex. [built_in_alphabetical, toolkit_alphabetical]

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Problem 733. Extract Built In Functions and Toolbox Functions from String or Function Handle

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Problem 733. Extract Built In Functions and Toolbox Functions from String or Function Handle

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