Problem 581. Function composition

Created by David Hruska

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Write a function that accepts two function handles f and g and returns the composition h. That is,

h = (f o g)(x) = f(g(x))

Example:

>> f = @(x)x^2;
>> g = @(x)x+1;
>> h = composeFcn(f,g);
>> h(3)
ans =
  16

because (3+1)^2 = 16.

Solve

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Last solution submitted on Sep 24, 2019

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6 Comments

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Jihye Sofia Seo on 16 Feb 2017

My code runs fine on my local machine, but I get error messages when I try it here.

Jihye Sofia Seo on 16 Feb 2017

Error using compose (line 85) First argument must be a string array, character vector, or cell array of character vectors. Error in TestPoint1 (line 3) h = compose(f,g);

yurenchu on 25 Apr 2017

To the creator of this problem: please rename this function in your test suite. "Compose" is already a built-in MATLAB function.

David Hruska on 26 Apr 2017

Changed the function name to composeFcn to avoid clashing with the compose built-in function. Let me know if you're still having trouble!

Ned Gulley on 26 Apr 2017

I guess the name needed changing, but be aware that if we ever re-score old entries, everyone who passed before the name change will now fail, since they will now be calling the wrong function.

yurenchu on 27 Apr 2017

Thanks, David Hruska!

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Problem 581. Function composition

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Problem 581. Function composition

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