Problem 1057. Given a matrix, return the last eigen value

Solution 320255

Submitted on 17 Sep 2013 by Saptarshi Roy

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Test	Status	Code Input and Output
1	Pass	%% x = [1 2 3 0 4 3 2 5 -1 0 0 0 2 3 4 3 2 5 4 0 -9 0 0 -2 -3]; k = eig(x); y_correct = k(end); assert(isequal(last_eig(x),y_correct)) ei = -1.7849 + 2.6263i -1.7849 - 2.6263i 1.4184 + 4.5789i 1.4184 - 4.5789i 6.7330 + 0.0000i
2	Pass	%% x = [1 2 3 6 4 -1 -9 1 3]; k = eig(x); y_correct = k(end); assert(isequal(last_eig(x),y_correct)) ei = 1.1967 + 4.4888i 1.1967 - 4.4888i 5.6067 + 0.0000i
3	Pass	%% x = magic(6); k = eig(x); y_correct = k(end); assert(isequal(last_eig(x),y_correct)) ei = 111.0000 27.0000 -27.0000 9.7980 -0.0000 -9.7980

Test

Status

Code Input and Output

Pass

%% x = [1 2 3 0 4 3 2 5 -1 0 0 0 2 3 4 3 2 5 4 0 -9 0 0 -2 -3]; k = eig(x); y_correct = k(end); assert(isequal(last_eig(x),y_correct))

ei = -1.7849 + 2.6263i -1.7849 - 2.6263i 1.4184 + 4.5789i 1.4184 - 4.5789i 6.7330 + 0.0000i

Pass

%% x = [1 2 3 6 4 -1 -9 1 3]; k = eig(x); y_correct = k(end); assert(isequal(last_eig(x),y_correct))

ei = 1.1967 + 4.4888i 1.1967 - 4.4888i 5.6067 + 0.0000i

Pass

%% x = magic(6); k = eig(x); y_correct = k(end); assert(isequal(last_eig(x),y_correct))

ei = 111.0000 27.0000 -27.0000 9.7980 -0.0000 -9.7980