Problem 582. Function composition - harder

Created by David Hruska

Solve Later

Write a function that accepts an arbitrary number of function handles f_1, f_2, ..., f_n and returns the composition h. That is,

h = (f_1 o f_2 o ... o f_n)(x) = f_1(f_2( ... f_n(x) ... ))

Example:

>> f1 = @(x)x+1;
>> f2 = @(x)3*x;
>> f3 = @sqrt;
>> h = composeFcn(f1,f2,f3);
>> h(9)
ans =
  10

because 3*sqrt(9)+1 = 10.

You can assume that there will always be at least one input passed to the composeFcn function.

Solve

Solution Stats

Last solution submitted on Dec 26, 2018

Last 200 Solutions

Problem Comments

1 Comment

1 Comment

Daniel Pereira on 7 Feb 2017

"compose" is a built-in Matlab function.
Please, change the function name in the test suite, since no new solution is allowed.

Solution Comments

Solution 1114522

2 Comments

2 Comments

Daniel Pereira on 2 Feb 2017

This problema keeps returning an error which, to my understanding, does not make sense, since my function has only 5 lines.

Error using compose (line 85) First argument must be a string array, character vector, or cell array of character vectors. Error in TestPoint1 (line 4) h = compose(f1,f2,f3);

David Hruska on 3 Mar 2017

Apologies for the trouble! I have renamed to the function to "composeFcn" to avoid clashing with the MATLAB "compose" function. Give it a try now.

Solution 181595

1 Comment

1 Comment

bainhome on 11 Apr 2015

it took me almost half an hour to get how this programm work.impressive!