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

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'

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