Problem 4. Make a checkerboard matrix

Solution 1396924

Submitted on 29 Dec 2017

Size: 33
Leading solution size is 7.

This solution is locked. To view this solution, you need to provide a solution of the same size or smaller.

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2 Comments

2 Comments

claus becker on 29 Dec 2017

we are getting failed even though the code works

claus becker on 29 Dec 2017

this works

function a = checkerboard(n)
b = ones(n,n);
for i=2:2:n^2;
b(i)=0;
end
a=b
end

Test Suite

Test	Status	Code Input and Output
1	Pass	n = 5; a = [1 0 1 0 1; 0 1 0 1 0; 1 0 1 0 1; 0 1 0 1 0; 1 0 1 0 1]; assert(isequal(a,checkerboard(n))) b = 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 b = 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 b = 1 0 1 1 1 0 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 b = 1 0 1 1 1 0 1 1 1 1 1 0 1 1 1 0 1 1 1 1 1 1 1 1 1 b = 1 0 1 1 1 0 1 1 1 1 1 0 1 1 1 0 1 1 1 1 1 0 1 1 1 b = 1 0 1 1 1 0 1 0 1 1 1 0 1 1 1 0 1 1 1 1 1 0 1 1 1 b = 1 0 1 1 1 0 1 0 1 1 1 0 1 1 1 0 1 0 1 1 1 0 1 1 1 b = 1 0 1 0 1 0 1 0 1 1 1 0 1 1 1 0 1 0 1 1 1 0 1 1 1 b = 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 1 1 0 1 1 1 b = 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 a = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
2	Fail	n = 4; a = [1 0 1 0; 0 1 0 1; 1 0 1 0; 0 1 0 1]; assert(isequal(a,checkerboard(n))) b = 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 b = 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 b = 1 1 1 1 0 0 1 1 1 1 1 1 0 1 1 1 b = 1 1 1 1 0 0 1 1 1 1 1 1 0 0 1 1 b = 1 1 1 1 0 0 0 1 1 1 1 1 0 0 1 1 b = 1 1 1 1 0 0 0 1 1 1 1 1 0 0 0 1 b = 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 1 b = 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 a = 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 Assertion failed.
3	Pass	n = 7; a = [1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1]; assert(isequal(a,checkerboard(n))) b = 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 b = 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 b = 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 b = 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 b = 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 b = 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 b = 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 b = 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 b = 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 b = 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 b = 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 b = 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 b = 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 b = 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 b = 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 b = 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 b = 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 a = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1

Test

Status

Code Input and Output

Pass

n = 5; a = [1 0 1 0 1; 0 1 0 1 0; 1 0 1 0 1; 0 1 0 1 0; 1 0 1 0 1]; assert(isequal(a,checkerboard(n)))

b = 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 b = 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 b = 1 0 1 1 1 0 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 b = 1 0 1 1 1 0 1 1 1 1 1 0 1 1 1 0 1 1 1 1 1 1 1 1 1 b = 1 0 1 1 1 0 1 1 1 1 1 0 1 1 1 0 1 1 1 1 1 0 1 1 1 b = 1 0 1 1 1 0 1 0 1 1 1 0 1 1 1 0 1 1 1 1 1 0 1 1 1 b = 1 0 1 1 1 0 1 0 1 1 1 0 1 1 1 0 1 0 1 1 1 0 1 1 1 b = 1 0 1 0 1 0 1 0 1 1 1 0 1 1 1 0 1 0 1 1 1 0 1 1 1 b = 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 1 1 0 1 1 1 b = 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 a = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1

Fail

n = 4; a = [1 0 1 0; 0 1 0 1; 1 0 1 0; 0 1 0 1]; assert(isequal(a,checkerboard(n)))

b = 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 b = 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 b = 1 1 1 1 0 0 1 1 1 1 1 1 0 1 1 1 b = 1 1 1 1 0 0 1 1 1 1 1 1 0 0 1 1 b = 1 1 1 1 0 0 0 1 1 1 1 1 0 0 1 1 b = 1 1 1 1 0 0 0 1 1 1 1 1 0 0 0 1 b = 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 1 b = 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 a = 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0

Assertion failed.

Pass

n = 7; a = [1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1]; assert(isequal(a,checkerboard(n)))

b = 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 b = 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 b = 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 b = 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 b = 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 b = 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 b = 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 b = 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 b = 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 0 1 1 1 1 1 b = 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 b = 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 b = 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 b = 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 1 1 b = 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 b = 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 b = 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 1 b = 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 1 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 b = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 a = 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1

Problem 4. Make a checkerboard matrix

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Problem 4. Make a checkerboard matrix

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