Cody

# Problem 44350. Breaking Out of the Matrix

Solution 2737645

Submitted on 24 Jul 2020
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### Test Suite

Test Status Code Input and Output
1   Fail
M=[1 4 7 10; 2 5 8 11; 3 6 9 12]; R=2;C=3; X(:,:,1) =[1 4 7 ; 2 5 8]; X(:,:,2) =[2 5 8 ; 3 6 9]; X(:,:,3) =[4 7 10 ; 5 8 11]; X(:,:,4) =[5 8 11 ; 6 9 12]; assert(isequal(BreakTheMatrix(M,R,C),X))

Error using reshape Number of elements must not change. Use [] as one of the size inputs to automatically calculate the appropriate size for that dimension. Error in BreakTheMatrix (line 2) y = permute(reshape(M,R,C,length(M)),[1 2 3]); Error in Test1 (line 9) assert(isequal(BreakTheMatrix(M,R,C),X))

2   Pass
x=1:ceil(35+25*rand());r=1;c=1; M=BreakTheMatrix(x,r,c); assert(all(arrayfun(@(y) (M(:,:,y)==y),1:numel(x))))

3   Fail
x=eye(7);r=2;c=2; M=BreakTheMatrix(x,r,c); ids=[1 8 15 22 29 36]; urs=ids(1:5)+1; lls=urs+5; z=setxor(1:size(M,3),[ids urs lls]); a1=arrayfun(@(a) isequal(M(:,:,a),eye(2)),ids); a2=arrayfun(@(a) isequal(M(:,:,a),[0 1 ; 0 0]),urs); a3=arrayfun(@(a) isequal(M(:,:,a),[0 0 ; 1 0]),lls); a4=arrayfun(@(a) isequal(M(:,:,a),zeros(2)),z); assert(all([a1 a2 a3 a4]))

Error using reshape Number of elements must not change. Use [] as one of the size inputs to automatically calculate the appropriate size for that dimension. Error in BreakTheMatrix (line 2) y = permute(reshape(M,R,C,length(M)),[1 2 3]); Error in Test3 (line 2) M=BreakTheMatrix(x,r,c);

4   Fail
u=ceil(10*rand())+4; x=magic(u);r=u;c=u; M=BreakTheMatrix(x,r,c); assert(isequal(M,x))

Error using reshape Number of elements must not change. Use [] as one of the size inputs to automatically calculate the appropriate size for that dimension. Error in BreakTheMatrix (line 2) y = permute(reshape(M,R,C,length(M)),[1 2 3]); Error in Test4 (line 3) M=BreakTheMatrix(x,r,c);

5   Fail
temp=ceil(8*rand)+3; x=ones(temp);r=2;c=2; M=BreakTheMatrix(x,r,c); assert(size(M,3)==(temp-1)^2); assert(all(arrayfun(@(a) isequal(M(:,:,a),ones(2)),1:size(M,3))))

Error using reshape Number of elements must not change. Use [] as one of the size inputs to automatically calculate the appropriate size for that dimension. Error in BreakTheMatrix (line 2) y = permute(reshape(M,R,C,length(M)),[1 2 3]); Error in Test5 (line 3) M=BreakTheMatrix(x,r,c);

6   Fail
x=eye(7);r=7;c=7; assert(isequal(x,BreakTheMatrix(x,r,c)))

Error using reshape Number of elements must not change. Use [] as one of the size inputs to automatically calculate the appropriate size for that dimension. Error in BreakTheMatrix (line 2) y = permute(reshape(M,R,C,length(M)),[1 2 3]); Error in Test6 (line 2) assert(isequal(x,BreakTheMatrix(x,r,c)))