Cody

# Problem 42854. Crunch that matrix!

Solution 2734630

Submitted on 24 Jul 2020
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### Test Suite

Test Status Code Input and Output
1   Fail
a=reshape(1:36,6,[]); b=[sum(a(:,1:3),2) sum(a(:,4:6),2)]; m=matrix_crunch(a); assert(max(max(abs(m-b)))<1e-10)

Error using reshape Product of known dimensions, 3, not divisible into total number of elements, 1. Error in Test1 (line 3) m=matrix_crunch(a);

2   Fail
a=magic(9)-30; b=[sum(a(:,1:3),2) sum(a(:,4:6),2) sum(a(:,7:9),2)]; m=matrix_crunch(a); assert(max(max(abs(m-b)))<1e-10)

Error using reshape Product of known dimensions, 3, not divisible into total number of elements, 1. Error in Test2 (line 3) m=matrix_crunch(a);

3   Fail
a=rand(12); b=[sum(a(:,1:3),2) sum(a(:,4:6),2) sum(a(:,7:9),2) sum(a(:,10:12),2)]; m=matrix_crunch(a); assert(max(max(abs(m-b)))<1e-10)

Error using reshape Product of known dimensions, 3, not divisible into total number of elements, 1. Error in Test3 (line 3) m=matrix_crunch(a);

4   Fail
a=ones(18); b=3*ones(18,6); m=matrix_crunch(a); assert(max(max(abs(m-b)))<1e-10)

Error using reshape Product of known dimensions, 3, not divisible into total number of elements, 1. Error in Test4 (line 3) m=matrix_crunch(a);

5   Fail
a=magic(15)+j.*flipud(magic(15)); a=a(1:10,:)-rand(10,15); b=[sum(a(:,1:3),2) sum(a(:,4:6),2) sum(a(:,7:9),2) sum(a(:,10:12),2) sum(a(:,13:15),2)]; m=matrix_crunch(a); assert(max(max(abs(m-b)))<1e-10)

Error using reshape Product of known dimensions, 3, not divisible into total number of elements, 1. Error in Test5 (line 4) m=matrix_crunch(a);

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