Cody

# Problem 1911. Find the index of the first occurrence of a value in a matrix

Solution 2059552

Submitted on 16 Dec 2019
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### Test Suite

Test Status Code Input and Output
1   Fail
x = [0 1;-1 0]; y_correct = [2 NaN]; assert(isequaln(findfirst(x),y_correct))

Index in position 1 is invalid. Array indices must be positive integers or logical values. Error in findfirst (line 6) if x(j,i) == -1 Error in Test1 (line 3) assert(isequaln(findfirst(x),y_correct))

2   Fail
x = [0 0 -1;2 -1 0]; y_correct = [NaN 2 1]; assert(isequaln(findfirst(x),y_correct))

Index in position 1 is invalid. Array indices must be positive integers or logical values. Error in findfirst (line 6) if x(j,i) == -1 Error in Test2 (line 3) assert(isequaln(findfirst(x),y_correct))

3   Fail
x = [0 1 0 -1;-1 -1 0 1;-1 1 0 -1;0 0 0 1]; y_correct = [2 2 NaN 1]; assert(isequaln(findfirst(x),y_correct))

Index in position 1 is invalid. Array indices must be positive integers or logical values. Error in findfirst (line 6) if x(j,i) == -1 Error in Test3 (line 3) assert(isequaln(findfirst(x),y_correct))