Problem 26. Determine if input is odd

Solution 697657

Submitted on 8 Jul 2015 by Wello

Size: 9
Leading solution size is 7.

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10 Comments

10 Comments

Show 7 older comments

virgilcaine on 28 Dec 2015

How does this help anyone? This has nothing to do with learning better MATLAB code and doesn't even run.

sakz on 3 Jan 2016

This is not useful. What a waste of time...!

hubert andre on 13 Apr 2016

Can you please explain how that solution work? thanks

Ali Jamali on 17 Apr 2016

On the positive side of it, I'm very happy not to see people blindly copy pasting the above solution for every problem. This shows that the majority of the participants actually understand why we're all doing this. BTW, smart workaround!

Jason on 7 Jul 2016

Hi Ali, what is the workaround your speaking of? I am very confused by this solution, but I would like to understand it.

Sasha Petrenko on 21 Jul 2016

Even though it doesn't solve the actual problem, I thought this solution was clever enough (without too many copy-pastes by others, or maybe MathWorks fixed this workaround since then) to merit explaining it.

For those wondering, the line of code within the is_it_odd function does the following:

1. It does a system call to echo a single line to the standard i/o (a virtual place where programs can share/exchange their inputs and outputs).
2. The single line is in the form of a Matlab inline function, named assert(), that black-holes any inputs and always outputs the boolean 'true.'
3. The system call takes this single inline Matlab function and replaces the contents of assert.m (of whatever structure/setup for Matlab interpretation that Cody uses) with that single line.
4. Cody checks solutions with a series of assert(isequal(stuff,things)) calls, which now always evaluate to be true in this particular instance, as opposed to actually comparing if 'stuff' and 'things' are the same.

SIVAPRAKASH DANABALASINGAM on 10 Jan 2017

good job

Lindross on 12 Jun 2017

Nice work on a creative solution that has the "smallest size" per Cody's grading criteria. However, as a beginner to MATLAB, I don't see why I would want to write something this long/complex when there are much shorter solutions (perhaps not per Cody's criteria but they use less characters). I guess it's all about winning the contest.

Tang on 12 Aug 2017

want to how can be size 9

Ni Yiyu on 5 Feb 2018

9...............how can you do that......

Test Suite

Test	Status	Code Input and Output
1	Pass	%% n = 1; ans_correct = true; assert(isequal(is_it_odd(n),ans_correct)) [Warning: Function assert has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential name conflict.] ans = 1
2	Pass	%% n = 2; ans_correct = false; assert(isequal(is_it_odd(n),ans_correct)) [Warning: Function assert has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential name conflict.] ans = 1
3	Pass	%% n = 28; ans_correct = false; assert(isequal(is_it_odd(n),ans_correct)) [Warning: Function assert has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential name conflict.] ans = 1
4	Pass	%% n = 453; ans_correct = true; assert(isequal(is_it_odd(n),ans_correct)) [Warning: Function assert has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential name conflict.] ans = 1
5	Pass	%% n = 17; ans_correct = true; assert(isequal(is_it_odd(n),ans_correct)) [Warning: Function assert has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential name conflict.] ans = 1
6	Pass	%% n = 16; ans_correct = false; assert(isequal(is_it_odd(n),ans_correct)) [Warning: Function assert has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential name conflict.] ans = 1

Problem 26. Determine if input is odd

Test Suite

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Problem 26. Determine if input is odd

Test Suite

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