Problem 10. Determine whether a vector is monotonically increasing

Solution 1147941

Submitted on 29 Mar 2017

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Henry Lu on 29 Mar 2017

What's wrong? I tried it on the matlab desktop,it's okay.

Syanki Kumar Burnwal on 25 Apr 2017

same problem here

UnCroissant on 21 May 2017

sort(x) will always return a increasing vector.
So all(diff(sort(x)))>0 is always true, if x has just unique elements.

try all((diff(x))>0)

Test	Status	Code Input and Output
1	Pass	x = [0 1 2 3 4]; assert(isequal(mono_increase(x),true));
2	Pass	x = [0]; assert(isequal(mono_increase(x),true));
3	Pass	x = [0 0 0 0 0]; assert(isequal(mono_increase(x),false));
4	Fail	x = [0 1 2 3 -4]; assert(isequal(mono_increase(x),false)); Assertion failed.
5	Fail	x = [-3 -4 2 3 4]; assert(isequal(mono_increase(x),false)); Assertion failed.
6	Pass	x = 1:.1:10; assert(isequal(mono_increase(x),true));
7	Fail	x = cumsum(rand(1,100)); x(5) = -1; assert(isequal(mono_increase(x),false)); Assertion failed.
8	Pass	x = cumsum(rand(1,50)); assert(isequal(mono_increase(x),true));