Cody

Problem 589. Matrix indexing with two vectors of indices

Solution 3388323

Submitted on 26 Oct 2020
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Test Suite

Test Status Code Input and Output
1   Fail
M = rand(4); a = [4 3 2 1]; b = [1 2 3 4]; v_correct = M([4 7 10 13]); assert(isequal(twoIndex(M,a,b),v_correct))

v = 0.5686 v = 0.1114 v = 0.4933 v = 0.2562

Assertion failed.

2   Fail
M = rand(4); a = [3 3 1 3]; b = [1 1 3 1]; v_correct = M([3 3 9 3]); assert(isequal(twoIndex(M,a,b),v_correct))

v = 0.3126 v = 0.3126 v = 0.1589 v = 0.3126

Assertion failed.

3   Fail
M = rand(100); [a,b] = size(M); v_correct = M(end); assert(isequal(twoIndex(M,a,b),v_correct))

v = 0.8136

Index exceeds the number of array elements (1). Error in twoIndex (line 3) v = M(a(i),b(i)) Error in Test3 (line 4) assert(isequal(twoIndex(M,a,b),v_correct))

4   Fail
M = rand(100); a = []; b = []; assert(isempty(twoIndex(M,a,b)))

Index exceeds the number of array elements (0). Error in twoIndex (line 3) v = M(a(i),b(i)) Error in Test4 (line 4) assert(isempty(twoIndex(M,a,b)))

5   Fail
M = 1; a = [1 1 1 1 1]; b = [1 1 1 1 1]; v_correct = [1 1 1 1 1]; assert(isequal(twoIndex(M,a,b),v_correct))

v = 1

Assertion failed.

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