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

Solution 1381646

Submitted on 15 Dec 2017 by Yanyan Liu

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Test	Status	Code Input and Output
1	Pass	x = [0 1;-1 0]; y_correct = [2 NaN]; assert(isequaln(findfirst(x),y_correct)) M = 2×2 logical array 0 0 1 0
2	Pass	x = [0 0 -1;2 -1 0]; y_correct = [NaN 2 1]; assert(isequaln(findfirst(x),y_correct)) M = 2×3 logical array 0 0 1 0 1 0
3	Pass	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)) M = 4×4 logical array 0 0 0 1 1 1 0 0 1 0 0 1 0 0 0 0

Test

Status

Code Input and Output

Pass

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

M = 2×2 logical array 0 0 1 0

Pass

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

M = 2×3 logical array 0 0 1 0 1 0

Pass

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))

M = 4×4 logical array 0 0 0 1 1 1 0 0 1 0 0 1 0 0 0 0