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

Solution 337819

Submitted on 23 Oct 2013 by Saptarshi Roy

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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)) r = 2 y = 2 r = Empty matrix: 0-by-1 y = 2 NaN
2	Pass	%% x = [0 0 -1;2 -1 0]; y_correct = [NaN 2 1]; assert(isequaln(findfirst(x),y_correct)) r = Empty matrix: 0-by-1 y = NaN r = 2 y = NaN 2 r = 1 y = NaN 2 1
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)) r = 2 y = 2 r = 2 y = 2 2 r = Empty matrix: 0-by-1 y = 2 2 NaN r = 1 y = 2 2 NaN 1

Test

Status

Code Input and Output

Pass

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

r = 2 y = 2 r = Empty matrix: 0-by-1 y = 2 NaN

Pass

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

r = Empty matrix: 0-by-1 y = NaN r = 2 y = NaN 2 r = 1 y = NaN 2 1

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))

r = 2 y = 2 r = 2 y = 2 2 r = Empty matrix: 0-by-1 y = 2 2 NaN r = 1 y = 2 2 NaN 1