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3 × 3 invertible matrices with non-real eigenvalues

The following are essentially all 3 × 3 invertible matrices that have non-real eigenvalues but integer singular values. They are grouped based on the maximum integer in absolute value in the matrix. The singular values are sorted, so if you want an invertible matrix that has two repeated singular values, you can search for, for example, "1, 1".

While the matrices are in the Matlab format, some of these have been tested in Maple to ensure that they are not the result of numeric error.

3 × 3 invertible matrices with non-real eigenvalues and no entries greater than one in absolute value

These are all such matrices up to multiplication by -1, in which case, the singular values are unchanged.

EigenvaluesSingular valuesMatrix
-j, j, -11, 1, 1[0 0 1; 0 -1 0; -1 0 0]
-j, j, 11, 1, 1[0 0 1; 0 1 0; -1 0 0]
-j, j, -11, 1, 1[0 1 0; -1 0 0; 0 0 -1]
-j, j, 11, 1, 1[0 1 0; -1 0 0; 0 0 1]
-j, j, 11, 1, 1[1 0 0; 0 0 -1; 0 1 0]
-j, j, 11, 1, 1[1 0 0; 0 0 1; 0 -1 0]

3 × 3 invertible matrices with non-real eigenvalues and no entries greater than two in absolute value

These are all such matrices up to multiplication by -1, in which case, the singular values are unchanged.

EigenvaluesSingular valuesMatrix
-1, 1 - 2j, 1 + 2j5, 1, 1[1 -2 -2; -2 1 2; 2 -2 -1]
-1 - 2j, -1 + 2j, -15, 1, 1[1 -2 -2; 2 -2 -1; 2 -1 -2]
-1, 1 - 2j, 1 + 2j5, 1, 1[1 -2 -2; 2 -1 -2; -2 2 1]
-1 - 2j, -1 + 2j, 15, 1, 1[1 -2 -2; 2 -1 -2; 2 -2 -1]
2 -2 - 2j, -2 + 2j,4, 2, 2[1 -2 -1; -2 -2 -2; 1 2 -1]
2 - 2j, 2 + 2j, -24, 2, 2[1 -2 -1; 2 2 2; 1 2 -1]
2 -2 - 2j, -2 + 2j,4, 2, 2[1 -2 1; -2 -2 2; -1 -2 -1]
2 - 2j, 2 + 2j, -24, 2, 2[1 -2 1; 2 2 -2; -1 -2 -1]
-1, 1 - 2j, 1 + 2j5, 1, 1[1 -2 2; -2 1 -2; -2 2 -1]
-1 - 2j, -1 + 2j, -15, 1, 1[1 -2 2; 2 -2 1; -2 1 -2]
-1 - 2j, -1 + 2j, 15, 1, 1[1 -2 2; 2 -1 2; -2 2 -1]
-1, 1 - 2j, 1 + 2j5, 1, 1[1 -2 2; 2 -1 2; 2 -2 1]
2 -2 - 2j, -2 + 2j,4, 2, 2[1 -1 -2; 1 -1 2; -2 -2 -2]
2 - 2j, 2 + 2j, -24, 2, 2[1 -1 -2; 1 -1 2; 2 2 2]
2 - 2j, 2 + 2j, -24, 2, 2[1 -1 2; 1 -1 -2; -2 -2 2]
2 -2 - 2j, -2 + 2j,4, 2, 2[1 -1 2; 1 -1 -2; 2 2 -2]
2 -2 - 2j, -2 + 2j,4, 2, 2[1 1 -2; -1 -1 -2; -2 2 -2]
2 - 2j, 2 + 2j, -24, 2, 2[1 1 -2; -1 -1 -2; 2 -2 2]
2 - 2j, 2 + 2j, -24, 2, 2[1 1 2; -1 -1 2; -2 2 2]
2 -2 - 2j, -2 + 2j,4, 2, 2[1 1 2; -1 -1 2; 2 -2 -2]
-1 - 2j, -1 + 2j, -15, 1, 1[1 2 -2; -2 -2 1; 2 1 -2]
-1, 1 - 2j, 1 + 2j5, 1, 1[1 2 -2; -2 -1 2; -2 -2 1]
-1 - 2j, -1 + 2j, 15, 1, 1[1 2 -2; -2 -1 2; 2 2 -1]
-1, 1 - 2j, 1 + 2j5, 1, 1[1 2 -2; 2 1 -2; 2 2 -1]
2 - 2j, 2 + 2j, -24, 2, 2[1 2 -1; -2 2 -2; 1 -2 -1]
2 -2 - 2j, -2 + 2j,4, 2, 2[1 2 -1; 2 -2 2; 1 -2 -1]
2 - 2j, 2 + 2j, -24, 2, 2[1 2 1; -2 2 2; -1 2 -1]
2 -2 - 2j, -2 + 2j,4, 2, 2[1 2 1; 2 -2 -2; -1 2 -1]
-1 - 2j, -1 + 2j, -15, 1, 1[1 2 2; -2 -2 -1; -2 -1 -2]
-1 - 2j, -1 + 2j, 15, 1, 1[1 2 2; -2 -1 -2; -2 -2 -1]
-1, 1 - 2j, 1 + 2j5, 1, 1[1 2 2; -2 -1 -2; 2 2 1]
-1, 1 - 2j, 1 + 2j5, 1, 1[1 2 2; 2 1 2; -2 -2 -1]
2 - 2j, 2 + 2j, -24, 2, 2[2 -2 -2; -2 -1 1; 2 -1 1]
2 - 2j, 2 + 2j, -24, 2, 2[2 -2 -2; 2 1 -1; -2 1 -1]
1 - 2j, 1 + 2j, 15, 1, 1[2 -2 -1; 2 -1 -2; -1 2 2]
1 - 2j, 1 + 2j, 15, 1, 1[2 -2 1; 2 -1 2; 1 -2 2]
2 - 2j, 2 + 2j, -24, 2, 2[2 -2 2; -2 -1 -1; -2 1 1]
2 - 2j, 2 + 2j, -24, 2, 2[2 -2 2; 2 1 1; 2 -1 -1]
1 - 2j, 1 + 2j, 15, 1, 1[2 -1 -2; -1 2 2; 2 -2 -1]
1 - 2j, 1 + 2j, 15, 1, 1[2 -1 2; -1 2 -2; -2 2 -1]
1 - 2j, 1 + 2j, 15, 1, 1[2 1 -2; 1 2 -2; 2 2 -1]
1 - 2j, 1 + 2j, 15, 1, 1[2 1 2; 1 2 2; -2 -2 -1]
2 - 2j, 2 + 2j, -24, 2, 2[2 2 -2; -2 1 1; -2 -1 -1]
2 - 2j, 2 + 2j, -24, 2, 2[2 2 -2; 2 -1 -1; 2 1 1]
1 - 2j, 1 + 2j, 15, 1, 1[2 2 -1; -2 -1 2; -1 -2 2]
1 - 2j, 1 + 2j, 15, 1, 1[2 2 1; -2 -1 -2; 1 2 2]
2 - 2j, 2 + 2j, -24, 2, 2[2 2 2; -2 1 -1; 2 1 -1]
2 - 2j, 2 + 2j, -24, 2, 2[2 2 2; 2 -1 1; -2 -1 1]

3 × 3 invertible matrices with non-real eigenvalues and no entries greater than three in absolute value

These are all such matrices up to multiplication by -1, in which case, the singular values are unchanged. This does not include integer multiples of matrices listed above.

EigenvaluesSingular valuesMatrix
5, 1 - 2j, 1 + 2j5, 5, 1[2 -3 -2; -3 2 -2; 2 2 3]
5, 1 - 2j, 1 + 2j5, 5, 1[2 -3 2; -3 2 2; -2 -2 3]
5, 1 - 2j, 1 + 2j5, 5, 1[2 -2 -3; 2 3 2; -3 -2 2]
5, 1 - 2j, 1 + 2j5, 5, 1[2 -2 3; 2 3 -2; 3 2 2]
5, 1 - 2j, 1 + 2j5, 5, 1[2 2 -3; -2 3 -2; -3 2 2]
5, 1 - 2j, 1 + 2j5, 5, 1[2 2 3; -2 3 2; 3 -2 2]
5, 1 - 2j, 1 + 2j5, 5, 1[2 3 -2; 3 2 2; 2 -2 3]
5, 1 - 2j, 1 + 2j5, 5, 1[2 3 2; 3 2 -2; -2 2 3]
5 -1 - 2j, -1 + 2j,5, 5, 1[3 -2 -2; -2 3 -2; 2 2 -3]
5 -1 - 2j, -1 + 2j,5, 5, 1[3 -2 -2; 2 -3 2; -2 -2 3]
1 - 2j, 1 + 2j, -55, 5, 1[3 -2 -2; 2 -3 2; 2 2 -3]
1 - 2j, 1 + 2j, 55, 5, 1[3 -2 -2; 2 2 -3; 2 -3 2]
5 -1 - 2j, -1 + 2j,5, 5, 1[3 -2 2; -2 3 2; -2 -2 -3]
1 - 2j, 1 + 2j, -55, 5, 1[3 -2 2; 2 -3 -2; -2 -2 -3]
5 -1 - 2j, -1 + 2j,5, 5, 1[3 -2 2; 2 -3 -2; 2 2 3]
1 - 2j, 1 + 2j, 55, 5, 1[3 -2 2; 2 2 3; -2 3 2]
5 -1 - 2j, -1 + 2j,5, 5, 1[3 2 -2; -2 -3 -2; -2 2 3]
1 - 2j, 1 + 2j, -55, 5, 1[3 2 -2; -2 -3 -2; 2 -2 -3]
1 - 2j, 1 + 2j, 55, 5, 1[3 2 -2; -2 2 3; 2 3 2]
5 -1 - 2j, -1 + 2j,5, 5, 1[3 2 -2; 2 3 2; 2 -2 -3]
1 - 2j, 1 + 2j, -55, 5, 1[3 2 2; -2 -3 2; -2 2 -3]
5 -1 - 2j, -1 + 2j,5, 5, 1[3 2 2; -2 -3 2; 2 -2 3]
1 - 2j, 1 + 2j, 55, 5, 1[3 2 2; -2 2 -3; -2 -3 2]
5 -1 - 2j, -1 + 2j,5, 5, 1[3 2 2; 2 3 -2; -2 2 -3]

3 × 3 invertible matrices with non-real eigenvalues and no entries greater than four in absolute value

These are all such matrices up to multiplication by -1, in which case, the singular values are unchanged. This does not include integer multiples of matrices listed above.

EigenvaluesSingular valuesMatrix
5 -4 - 2j, -4 + 2j,5, 5, 4[1 -4 -2; -2 -2 4; -4 1 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 -4 -2; -2 2 -4; 4 1 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 -4 -2; 2 -2 4; -4 -1 2]
5 -4 - 2j, -4 + 2j,5, 5, 4[1 -4 2; -2 -2 -4; 4 -1 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 -4 2; -2 2 4; -4 -1 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 -4 2; 2 -2 -4; 4 1 2]
5 -4 - 2j, -4 + 2j,5, 5, 4[1 -2 -4; -4 -2 1; -2 4 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 -2 -4; -4 2 -1; 2 4 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 -2 -4; 4 -2 1; -2 -4 2]
5 -4 - 2j, -4 + 2j,5, 5, 4[1 -2 4; -4 -2 -1; 2 -4 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 -2 4; -4 2 1; -2 -4 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 -2 4; 4 -2 -1; 2 4 2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 2 -4; -4 -2 -1; -2 4 2]
5 -4 - 2j, -4 + 2j,5, 5, 4[1 2 -4; 4 -2 -1; -2 -4 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 2 -4; 4 2 1; 2 -4 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 2 4; -4 -2 1; 2 -4 2]
5 -4 - 2j, -4 + 2j,5, 5, 4[1 2 4; 4 -2 1; 2 4 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 2 4; 4 2 -1; -2 4 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 4 -2; -2 -2 -4; -4 1 2]
5 -4 - 2j, -4 + 2j,5, 5, 4[1 4 -2; 2 -2 -4; -4 -1 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 4 -2; 2 2 4; 4 -1 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 4 2; -2 -2 4; 4 -1 2]
5 -4 - 2j, -4 + 2j,5, 5, 4[1 4 2; 2 -2 4; 4 1 -2]
5 -2 - 4j, -2 + 4j,5, 5, 4[1 4 2; 2 2 -4; -4 1 -2]
-6, 3 - 3j, 3 + 3j6, 6, 3[2 -4 -4; -4 -4 2; 2 -1 2]
6 -2 - 2j, -2 + 2j,8, 6, 1[2 -4 -4; -4 2 -4; -3 4 -2]
6 -2 - 2j, -2 + 2j,8, 6, 1[2 -4 -4; -4 2 -4; 4 -3 -2]
-2 - 2j, -2 + 2j, 68, 6, 1[2 -4 -4; -4 2 3; 4 4 -2]
6 -2 - 2j, -2 + 2j,8, 6, 1[2 -4 -4; -3 -2 4; -4 -4 2]
-6, 2 - 2j, 2 + 2j8, 6, 1[2 -4 -4; -3 -2 4; 4 4 -2]
6, 2 - 2j, 2 + 2j8, 6, 1[2 -4 -4; -3 4 -2; 4 -2 4]
-6, 3 - 3j, 3 + 3j6, 6, 3[2 -4 -4; 2 2 -1; -4 2 -4]
6 -2 - 2j, -2 + 2j,8, 6, 1[2 -4 -4; 4 -2 -3; -4 -4 2]
-2 - 2j, -2 + 2j, 68, 6, 1[2 -4 -4; 4 -2 4; -4 3 2]
-6, 2 - 2j, 2 + 2j8, 6, 1[2 -4 -4; 4 -2 4; -3 4 -2]
6, 2 - 2j, 2 + 2j8, 6, 1[2 -4 -4; 4 4 -2; -3 -2 4]
6 -2 - 2j, -2 + 2j,8, 6, 1[2 -4 -3; -4 2 4; -4 -4 -2]
2 - 2j, 2 + 2j, -68, 6, 1[2 -4 -3; 4 -2 -4; -4 -4 -2]
2 - 2j, 2 + 2j, 68, 6, 1[2 -4 -3; 4 4 2; -4 2 4]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 -4 -2; -1 2 -4; -4 -2 -1]
5 -2 - 4j, -2 + 4j,5, 5, 4[2 -4 -2; 1 -2 4; -4 -2 1]
2 - 4j, 2 + 4j, -55, 5, 4[2 -4 -2; 1 -2 4; 4 2 -1]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 -4 -1; -2 -1 -4; -4 -2 2]
5 -2 - 4j, -2 + 4j,5, 5, 4[2 -4 -1; -2 1 -4; 4 2 -2]
2 - 4j, 2 + 4j, -55, 5, 4[2 -4 -1; 2 -1 4; 4 2 -2]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 -4 1; -2 -1 4; 4 2 2]
5 -2 - 4j, -2 + 4j,5, 5, 4[2 -4 1; -2 1 4; -4 -2 -2]
2 - 4j, 2 + 4j, -55, 5, 4[2 -4 1; 2 -1 -4; -4 -2 -2]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 -4 2; -1 2 4; 4 2 -1]
2 - 4j, 2 + 4j, -55, 5, 4[2 -4 2; 1 -2 -4; -4 -2 -1]
5, -2 - 4j, -2 + 4j5, 5, 4[2 -4 2; 1 -2 -4; 4 2 1]
6, -2 - 2j, -2 + 2j8, 6, 1[2 -4 3; -4 2 -4; 4 4 -2]
2 - 2j, 2 + 2j, -68, 6, 1[2 -4 3; 4 -2 4; 4 4 -2]
2 - 2j, 2 + 2j, 68, 6, 1[2 -4 3; 4 4 -2; 4 -2 4]
-6, 3 - 3j, 3 + 3j6, 6, 3[2 -4 4; -4 -4 -2; -2 1 2]
-2 - 2j, -2 + 2j, 68, 6, 1[2 -4 4; -4 2 -3; -4 -4 -2]
6, -2 - 2j, -2 + 2j8, 6, 1[2 -4 4; -4 2 4; -4 3 -2]
6, -2 - 2j, -2 + 2j8, 6, 1[2 -4 4; -4 2 4; 3 -4 -2]
-6, 2 - 2j, 2 + 2j8, 6, 1[2 -4 4; -3 -2 -4; -4 -4 -2]
6, -2 - 2j, -2 + 2j8, 6, 1[2 -4 4; -3 -2 -4; 4 4 2]
6, 2 - 2j, 2 + 2j8, 6, 1[2 -4 4; -3 4 2; -4 2 4]
-6, 3 - 3j, 3 + 3j6, 6, 3[2 -4 4; 2 2 1; 4 -2 -4]
-6, 2 - 2j, 2 + 2j8, 6, 1[2 -4 4; 4 -2 -4; 3 -4 -2]
-2 - 2j, -2 + 2j, 68, 6, 1[2 -4 4; 4 -2 -4; 4 -3 2]
6, -2 - 2j, -2 + 2j8, 6, 1[2 -4 4; 4 -2 3; 4 4 2]
6, 2 - 2j, 2 + 2j8, 6, 1[2 -4 4; 4 4 2; 3 2 4]
6, -2 - 2j, -2 + 2j8, 6, 1[2 -3 -4; -4 -2 -4; -4 4 2]
2 - 2j, 2 + 2j, -68, 6, 1[2 -3 -4; -4 -2 -4; 4 -4 -2]
2 - 2j, 2 + 2j, 68, 6, 1[2 -3 -4; -4 4 2; 4 2 4]
2 - 2j, 2 + 2j, -68, 6, 1[2 -3 4; -4 -2 4; -4 4 -2]
6, -2 - 2j, -2 + 2j8, 6, 1[2 -3 4; -4 -2 4; 4 -4 2]
2 - 2j, 2 + 2j, 68, 6, 1[2 -3 4; -4 4 -2; -4 -2 4]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 -2 -4; -4 -1 -2; -1 -4 2]
5, -2 - 4j, -2 + 4j5, 5, 4[2 -2 -4; -4 1 -2; 1 4 -2]
2 - 4j, 2 + 4j, -55, 5, 4[2 -2 -4; 4 -1 2; 1 4 -2]
3 - 3j, 3 + 3j, -66, 6, 3[2 -2 -1; 4 2 4; 2 4 -4]
3 - 3j, 3 + 3j, 46, 4, 3[2 -2 -1; 4 4 0; 2 0 4]
3 - 3j, 3 + 3j, -66, 6, 3[2 -2 1; 4 2 -4; -2 -4 -4]
3 - 3j, 3 + 3j, 46, 4, 3[2 -2 1; 4 4 0; -2 0 4]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 -2 4; -4 -1 2; 1 4 2]
5, -2 - 4j, -2 + 4j5, 5, 4[2 -2 4; -4 1 2; -1 -4 -2]
2 - 4j, 2 + 4j, -55, 5, 4[2 -2 4; 4 -1 -2; -1 -4 -2]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 -1 -4; -4 2 -2; -2 -4 -1]
5, -2 - 4j, -2 + 4j5, 5, 4[2 -1 -4; 4 -2 2; -2 -4 1]
2 - 4j, 2 + 4j, -55, 5, 4[2 -1 -4; 4 -2 2; 2 4 -1]
3 - 3j, 3 + 3j, -66, 6, 3[2 -1 -2; 2 -4 4; 4 4 2]
3 - 3j, 3 + 3j, 46, 4, 3[2 -1 -2; 2 4 0; 4 0 4]
3 - 3j, 3 + 3j, -66, 6, 3[2 -1 2; 2 -4 -4; -4 -4 2]
3 - 3j, 3 + 3j, 46, 4, 3[2 -1 2; 2 4 0; -4 0 4]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 -1 4; -4 2 2; 2 4 -1]
2 - 4j, 2 + 4j, -55, 5, 4[2 -1 4; 4 -2 -2; -2 -4 -1]
5, -2 - 4j, -2 + 4j5, 5, 4[2 -1 4; 4 -2 -2; 2 4 1]
5, -2 - 4j, -2 + 4j5, 5, 4[2 1 -4; -4 -2 -2; -2 4 1]
2 - 4j, 2 + 4j, -55, 5, 4[2 1 -4; -4 -2 -2; 2 -4 -1]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 1 -4; 4 2 2; -2 4 -1]
3 - 3j, 3 + 3j, -66, 6, 3[2 1 -2; -2 -4 -4; 4 -4 2]
3 - 3j, 3 + 3j, 46, 4, 3[2 1 -2; -2 4 0; 4 0 4]
3 - 3j, 3 + 3j, -66, 6, 3[2 1 2; -2 -4 4; -4 4 2]
3 - 3j, 3 + 3j, 46, 4, 3[2 1 2; -2 4 0; -4 0 4]
2 - 4j, 2 + 4j, -55, 5, 4[2 1 4; -4 -2 2; -2 4 -1]
5, -2 - 4j, -2 + 4j5, 5, 4[2 1 4; -4 -2 2; 2 -4 1]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 1 4; 4 2 -2; 2 -4 -1]
2 - 4j, 2 + 4j, -55, 5, 4[2 2 -4; -4 -1 -2; 1 -4 -2]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 2 -4; 4 -1 2; -1 4 2]
5, -2 - 4j, -2 + 4j5, 5, 4[2 2 -4; 4 1 2; 1 -4 -2]
3 - 3j, 3 + 3j, -66, 6, 3[2 2 -1; -4 2 -4; 2 -4 -4]
3 - 3j, 3 + 3j, 46, 4, 3[2 2 -1; -4 4 0; 2 0 4]
3 - 3j, 3 + 3j, -66, 6, 3[2 2 1; -4 2 4; -2 4 -4]
3 - 3j, 3 + 3j, 46, 4, 3[2 2 1; -4 4 0; -2 0 4]
2 - 4j, 2 + 4j, -55, 5, 4[2 2 4; -4 -1 2; -1 4 -2]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 2 4; 4 -1 -2; 1 -4 2]
5, -2 - 4j, -2 + 4j5, 5, 4[2 2 4; 4 1 -2; -1 4 -2]
6, -2 - 2j, -2 + 2j8, 6, 1[2 3 -4; 4 -2 4; -4 -4 2]
2 - 2j, 2 + 2j, -68, 6, 1[2 3 -4; 4 -2 4; 4 4 -2]
2 - 2j, 2 + 2j, 68, 6, 1[2 3 -4; 4 4 -2; 4 -2 4]
2 - 2j, 2 + 2j, -68, 6, 1[2 3 4; 4 -2 -4; -4 -4 -2]
6, -2 - 2j, -2 + 2j8, 6, 1[2 3 4; 4 -2 -4; 4 4 2]
2 - 2j, 2 + 2j, 68, 6, 1[2 3 4; 4 4 2; -4 2 4]
-2 - 2j, -2 + 2j, 68, 6, 1[2 4 -4; -4 -2 -4; -4 -3 2]
-6, 2 - 2j, 2 + 2j8, 6, 1[2 4 -4; -4 -2 -4; -3 -4 -2]
6, -2 - 2j, -2 + 2j8, 6, 1[2 4 -4; -4 -2 3; -4 4 2]
6, 2 - 2j, 2 + 2j8, 6, 1[2 4 -4; -4 4 2; -3 2 4]
-6, 3 - 3j, 3 + 3j6, 6, 3[2 4 -4; -2 2 1; -4 -2 -4]
6, -2 - 2j, -2 + 2j8, 6, 1[2 4 -4; 3 -2 -4; -4 4 2]
-6, 2 - 2j, 2 + 2j8, 6, 1[2 4 -4; 3 -2 -4; 4 -4 -2]
6, 2 - 2j, 2 + 2j8, 6, 1[2 4 -4; 3 4 2; 4 2 4]
-6, 3 - 3j, 3 + 3j6, 6, 3[2 4 -4; 4 -4 -2; 2 1 2]
-2 - 2j, -2 + 2j, 68, 6, 1[2 4 -4; 4 2 -3; 4 -4 -2]
6, -2 - 2j, -2 + 2j8, 6, 1[2 4 -4; 4 2 4; -3 -4 -2]
6, -2 - 2j, -2 + 2j8, 6, 1[2 4 -4; 4 2 4; 4 3 -2]
2 - 2j, 2 + 2j, -68, 6, 1[2 4 -3; -4 -2 4; -4 4 -2]
2 - 2j, 2 + 2j, 68, 6, 1[2 4 -3; -4 4 -2; -4 -2 4]
6, -2 - 2j, -2 + 2j8, 6, 1[2 4 -3; 4 2 -4; -4 4 -2]
5, -2 - 4j, -2 + 4j5, 5, 4[2 4 -2; -1 -2 -4; -4 2 1]
2 - 4j, 2 + 4j, -55, 5, 4[2 4 -2; -1 -2 -4; 4 -2 -1]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 4 -2; 1 2 4; -4 2 -1]
2 - 4j, 2 + 4j, -55, 5, 4[2 4 -1; -2 -1 -4; 4 -2 -2]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 4 -1; 2 -1 4; -4 2 2]
5, -2 - 4j, -2 + 4j5, 5, 4[2 4 -1; 2 1 4; 4 -2 -2]
2 - 4j, 2 + 4j, -55, 5, 4[2 4 1; -2 -1 4; -4 2 -2]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 4 1; 2 -1 -4; 4 -2 2]
5, -2 - 4j, -2 + 4j5, 5, 4[2 4 1; 2 1 -4; -4 2 -2]
2 - 4j, 2 + 4j, -55, 5, 4[2 4 2; -1 -2 4; -4 2 -1]
5, -2 - 4j, -2 + 4j5, 5, 4[2 4 2; -1 -2 4; 4 -2 1]
-5, 4 - 2j, 4 + 2j5, 5, 4[2 4 2; 1 2 -4; 4 -2 -1]
2 - 2j, 2 + 2j, -68, 6, 1[2 4 3; -4 -2 -4; 4 -4 -2]
2 - 2j, 2 + 2j, 68, 6, 1[2 4 3; -4 4 2; 4 2 4]
6, -2 - 2j, -2 + 2j8, 6, 1[2 4 3; 4 2 4; 4 -4 -2]
6, -2 - 2j, -2 + 2j8, 6, 1[2 4 4; -4 -2 -3; 4 -4 2]
-6, 2 - 2j, 2 + 2j8, 6, 1[2 4 4; -4 -2 4; 3 4 -2]
-2 - 2j, -2 + 2j, 68, 6, 1[2 4 4; -4 -2 4; 4 3 2]
6, 2 - 2j, 2 + 2j8, 6, 1[2 4 4; -4 4 -2; 3 -2 4]
-6, 3 - 3j, 3 + 3j6, 6, 3[2 4 4; -2 2 -1; 4 2 -4]
-6, 2 - 2j, 2 + 2j8, 6, 1[2 4 4; 3 -2 4; -4 4 -2]
6, -2 - 2j, -2 + 2j8, 6, 1[2 4 4; 3 -2 4; 4 -4 2]
6, 2 - 2j, 2 + 2j8, 6, 1[2 4 4; 3 4 -2; -4 -2 4]
-6, 3 - 3j, 3 + 3j6, 6, 3[2 4 4; 4 -4 2; -2 -1 2]
6, -2 - 2j, -2 + 2j8, 6, 1[2 4 4; 4 2 -4; -4 -3 -2]
6, -2 - 2j, -2 + 2j8, 6, 1[2 4 4; 4 2 -4; 3 4 -2]
-2 - 2j, -2 + 2j, 68, 6, 1[2 4 4; 4 2 3; -4 4 -2]
3 - 4j, 3 + 4j, -45, 5, 4[3 -4 0; 4 3 0; 0 0 -4]
3 - 4j, 3 + 4j, 45, 5, 4[3 -4 0; 4 3 0; 0 0 4]
3 - 4j, 3 + 4j, -45, 5, 4[3 0 -4; 0 -4 0; 4 0 3]
3 - 4j, 3 + 4j, 45, 5, 4[3 0 -4; 0 4 0; 4 0 3]
3 - 4j, 3 + 4j, -45, 5, 4[3 0 4; 0 -4 0; -4 0 3]
3 - 4j, 3 + 4j, 45, 5, 4[3 0 4; 0 4 0; -4 0 3]
3 - 4j, 3 + 4j, -45, 5, 4[3 4 0; -4 3 0; 0 0 -4]
3 - 4j, 3 + 4j, 45, 5, 4[3 4 0; -4 3 0; 0 0 4]
-3j, 3j, -49, 4, 1[4 -4 -3; 4 -4 0; 3 0 -4]
6, -3 - 3j, -3 + 3j6, 6, 3[4 -4 -2; -4 -2 -4; 1 2 -2]
6, 2 - 2j, 2 + 2j8, 6, 1[4 -4 -2; -3 2 4; -2 -4 4]
6, 2 - 2j, 2 + 2j8, 6, 1[4 -4 -2; 4 2 -3; -2 -4 4]
2 - 2j, 2 + 2j, 68, 6, 1[4 -4 -2; 4 2 4; -2 3 4]
3 - 3j, 3 + 3j, 46, 4, 3[4 -4 0; 2 2 -1; 0 2 4]
3 - 3j, 3 + 3j, 46, 4, 3[4 -4 0; 2 2 1; 0 -2 4]
-3j, 3j, 49, 4, 1[4 -4 0; 4 -4 -3; 0 3 4]
-3j, 3j, 49, 4, 1[4 -4 0; 4 -4 3; 0 -3 4]
6, -3 - 3j, -3 + 3j6, 6, 3[4 -4 2; -4 -2 4; -1 -2 -2]
6, 2 - 2j, 2 + 2j8, 6, 1[4 -4 2; -3 2 -4; 2 4 4]
2 - 2j, 2 + 2j, 68, 6, 1[4 -4 2; 4 2 -4; 2 -3 4]
6, 2 - 2j, 2 + 2j8, 6, 1[4 -4 2; 4 2 3; 2 4 4]
-3j, 3j, -49, 4, 1[4 -4 3; 4 -4 0; -3 0 -4]
-3j, 3j, -49, 4, 1[4 -3 -4; 3 -4 0; 4 0 -4]
6, 2 - 2j, 2 + 2j8, 6, 1[4 -3 -2; -4 2 -4; -2 4 4]
4, -3j, 3j9, 4, 1[4 -3 0; 3 -4 -4; 0 4 4]
4, -3j, 3j9, 4, 1[4 -3 0; 3 -4 4; 0 -4 4]
4 - 3j, 4 + 3j, -45, 5, 4[4 -3 0; 3 4 0; 0 0 -4]
4 - 3j, 4 + 3j, 45, 5, 4[4 -3 0; 3 4 0; 0 0 4]
6, 2 - 2j, 2 + 2j8, 6, 1[4 -3 2; -4 2 4; 2 -4 4]
-3j, 3j, -49, 4, 1[4 -3 4; 3 -4 0; -4 0 -4]
6, 2 - 2j, 2 + 2j8, 6, 1[4 -2 -4; -2 4 -4; -3 4 2]
6, 2 - 2j, 2 + 2j8, 6, 1[4 -2 -4; -2 4 -4; 4 -3 2]
2 - 2j, 2 + 2j, 68, 6, 1[4 -2 -4; -2 4 3; 4 4 2]
6, -3 - 3j, -3 + 3j6, 6, 3[4 -2 -4; 1 -2 2; -4 -4 -2]
6, 2 - 2j, 2 + 2j8, 6, 1[4 -2 -3; -2 4 4; -4 -4 2]
4 - 3j, 4 + 3j, 45, 5, 4[4 -2 -2; 2 4 -1; 2 1 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 -2 -2; 2 4 1; 2 -1 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 -2 -1; 2 4 -2; 1 2 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 -2 -1; 2 4 2; 1 -2 4]
4, 3 - 3j, 3 + 3j6, 4, 3[4 -2 0; 1 2 -2; 0 4 4]
4, 3 - 3j, 3 + 3j6, 4, 3[4 -2 0; 1 2 2; 0 -4 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 -2 1; 2 4 -2; -1 2 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 -2 1; 2 4 2; -1 -2 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 -2 2; 2 4 -1; -2 1 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 -2 2; 2 4 1; -2 -1 4]
6, 2 - 2j, 2 + 2j8, 6, 1[4 -2 3; -2 4 -4; 4 4 2]
2 - 2j, 2 + 2j, 68, 6, 1[4 -2 4; -2 4 -3; -4 -4 2]
6, 2 - 2j, 2 + 2j8, 6, 1[4 -2 4; -2 4 4; -4 3 2]
6, 2 - 2j, 2 + 2j8, 6, 1[4 -2 4; -2 4 4; 3 -4 2]
6, -3 - 3j, -3 + 3j6, 6, 3[4 -2 4; 1 -2 -2; 4 4 -2]
4 - 3j, 4 + 3j, 45, 5, 4[4 -1 -2; 1 4 -2; 2 2 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 -1 -2; 1 4 2; 2 -2 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 -1 2; 1 4 -2; -2 2 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 -1 2; 1 4 2; -2 -2 4]
-3j, 3j, 49, 4, 1[4 0 -4; 0 4 -3; 4 3 -4]
3 - 3j, 3 + 3j, 46, 4, 3[4 0 -4; 0 4 -2; 2 1 2]
3 - 3j, 3 + 3j, 46, 4, 3[4 0 -4; 0 4 2; 2 -1 2]
-3j, 3j, 49, 4, 1[4 0 -4; 0 4 3; 4 -3 -4]
4 - 3j, 4 + 3j, -45, 5, 4[4 0 -3; 0 -4 0; 3 0 4]
4, -3j, 3j9, 4, 1[4 0 -3; 0 4 -4; 3 4 -4]
4 - 3j, 4 + 3j, 45, 5, 4[4 0 -3; 0 4 0; 3 0 4]
4, -3j, 3j9, 4, 1[4 0 -3; 0 4 4; 3 -4 -4]
4, 3 - 3j, 3 + 3j6, 4, 3[4 0 -2; 0 4 -4; 1 2 2]
4, 3 - 3j, 3 + 3j6, 4, 3[4 0 -2; 0 4 4; 1 -2 2]
-4 - 3j, -4 + 3j, 45, 5, 4[4 0 0; 0 -4 -3; 0 3 -4]
-4 - 3j, -4 + 3j, 45, 5, 4[4 0 0; 0 -4 3; 0 -3 -4]
-3 - 4j, -3 + 4j, 45, 5, 4[4 0 0; 0 -3 -4; 0 4 -3]
-3 - 4j, -3 + 4j, 45, 5, 4[4 0 0; 0 -3 4; 0 -4 -3]
3 - 4j, 3 + 4j, 45, 5, 4[4 0 0; 0 3 -4; 0 4 3]
3 - 4j, 3 + 4j, 45, 5, 4[4 0 0; 0 3 4; 0 -4 3]
4 - 3j, 4 + 3j, 45, 5, 4[4 0 0; 0 4 -3; 0 3 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 0 0; 0 4 3; 0 -3 4]
4, 3 - 3j, 3 + 3j6, 4, 3[4 0 2; 0 4 -4; -1 2 2]
4, 3 - 3j, 3 + 3j6, 4, 3[4 0 2; 0 4 4; -1 -2 2]
4 - 3j, 4 + 3j, -45, 5, 4[4 0 3; 0 -4 0; -3 0 4]
4, -3j, 3j9, 4, 1[4 0 3; 0 4 -4; -3 4 -4]
4 - 3j, 4 + 3j, 45, 5, 4[4 0 3; 0 4 0; -3 0 4]
4, -3j, 3j9, 4, 1[4 0 3; 0 4 4; -3 -4 -4]
-3j, 3j, 49, 4, 1[4 0 4; 0 4 -3; -4 3 -4]
3 - 3j, 3 + 3j, 46, 4, 3[4 0 4; 0 4 -2; -2 1 2]
3 - 3j, 3 + 3j, 46, 4, 3[4 0 4; 0 4 2; -2 -1 2]
-3j, 3j, 49, 4, 1[4 0 4; 0 4 3; -4 -3 -4]
4 - 3j, 4 + 3j, 45, 5, 4[4 1 -2; -1 4 -2; 2 2 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 1 -2; -1 4 2; 2 -2 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 1 2; -1 4 -2; -2 2 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 1 2; -1 4 2; -2 -2 4]
6, -3 - 3j, -3 + 3j6, 6, 3[4 2 -4; -1 -2 -2; -4 4 -2]
2 - 2j, 2 + 2j, 68, 6, 1[4 2 -4; 2 4 -3; 4 -4 2]
6, 2 - 2j, 2 + 2j8, 6, 1[4 2 -4; 2 4 4; -3 -4 2]
6, 2 - 2j, 2 + 2j8, 6, 1[4 2 -4; 2 4 4; 4 3 2]
6, 2 - 2j, 2 + 2j8, 6, 1[4 2 -3; 2 4 -4; -4 4 2]
4 - 3j, 4 + 3j, 45, 5, 4[4 2 -2; -2 4 -1; 2 1 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 2 -2; -2 4 1; 2 -1 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 2 -1; -2 4 -2; 1 2 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 2 -1; -2 4 2; 1 -2 4]
4, 3 - 3j, 3 + 3j6, 4, 3[4 2 0; -1 2 -2; 0 4 4]
4, 3 - 3j, 3 + 3j6, 4, 3[4 2 0; -1 2 2; 0 -4 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 2 1; -2 4 -2; -1 2 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 2 1; -2 4 2; -1 -2 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 2 2; -2 4 -1; -2 1 4]
4 - 3j, 4 + 3j, 45, 5, 4[4 2 2; -2 4 1; -2 -1 4]
6, 2 - 2j, 2 + 2j8, 6, 1[4 2 3; 2 4 4; 4 -4 2]
6, -3 - 3j, -3 + 3j6, 6, 3[4 2 4; -1 -2 2; 4 -4 -2]
6, 2 - 2j, 2 + 2j8, 6, 1[4 2 4; 2 4 -4; -4 -3 2]
6, 2 - 2j, 2 + 2j8, 6, 1[4 2 4; 2 4 -4; 3 4 2]
2 - 2j, 2 + 2j, 68, 6, 1[4 2 4; 2 4 3; -4 4 2]
-3j, 3j, -49, 4, 1[4 3 -4; -3 -4 0; 4 0 -4]
6, 2 - 2j, 2 + 2j8, 6, 1[4 3 -2; 4 2 4; -2 -4 4]
4, -3j, 3j9, 4, 1[4 3 0; -3 -4 -4; 0 4 4]
4, -3j, 3j9, 4, 1[4 3 0; -3 -4 4; 0 -4 4]
4 - 3j, 4 + 3j, -45, 5, 4[4 3 0; -3 4 0; 0 0 -4]
4 - 3j, 4 + 3j, 45, 5, 4[4 3 0; -3 4 0; 0 0 4]
6, 2 - 2j, 2 + 2j8, 6, 1[4 3 2; 4 2 -4; 2 4 4]
-3j, 3j, -49, 4, 1[4 3 4; -3 -4 0; -4 0 -4]
-3j, 3j, -49, 4, 1[4 4 -3; -4 -4 0; 3 0 -4]
2 - 2j, 2 + 2j, 68, 6, 1[4 4 -2; -4 2 -4; -2 -3 4]
6, 2 - 2j, 2 + 2j8, 6, 1[4 4 -2; -4 2 3; -2 4 4]
6, 2 - 2j, 2 + 2j8, 6, 1[4 4 -2; 3 2 -4; -2 4 4]
6, -3 - 3j, -3 + 3j6, 6, 3[4 4 -2; 4 -2 4; 1 -2 -2]
-3j, 3j, 49, 4, 1[4 4 0; -4 -4 -3; 0 3 4]
-3j, 3j, 49, 4, 1[4 4 0; -4 -4 3; 0 -3 4]
3 - 3j, 3 + 3j, 46, 4, 3[4 4 0; -2 2 -1; 0 2 4]
3 - 3j, 3 + 3j, 46, 4, 3[4 4 0; -2 2 1; 0 -2 4]
6, 2 - 2j, 2 + 2j8, 6, 1[4 4 2; -4 2 -3; 2 -4 4]
2 - 2j, 2 + 2j, 68, 6, 1[4 4 2; -4 2 4; 2 3 4]
6, 2 - 2j, 2 + 2j8, 6, 1[4 4 2; 3 2 4; 2 -4 4]
6, -3 - 3j, -3 + 3j6, 6, 3[4 4 2; 4 -2 -4; -1 2 -2]
-3j, 3j, -49, 4, 1[4 4 3; -4 -4 0; -3 0 -4]

3 × 3 invertible matrices with non-real eigenvalues and no entries greater than five in absolute value

These are all such matrices up to multiplication by -1, in which case, the singular values are unchanged. This does not include integer multiples of matrices listed above.

EigenvaluesSingular valuesMatrix
-4j, 4j, -58, 5, 2[3 -5 0; 5 -3 0; 0 0 -5]
-4j, 4j, 58, 5, 2[3 -5 0; 5 -3 0; 0 0 5]
-4j, 4j, -58, 5, 2[3 0 -5; 0 -5 0; 5 0 -3]
-4j, 4j, 58, 5, 2[3 0 -5; 0 5 0; 5 0 -3]
-4j, 4j, -58, 5, 2[3 0 5; 0 -5 0; -5 0 -3]
-4j, 4j, 58, 5, 2[3 0 5; 0 5 0; -5 0 -3]
-4j, 4j, -58, 5, 2[3 5 0; -5 -3 0; 0 0 -5]
-4j, 4j, 58, 5, 2[3 5 0; -5 -3 0; 0 0 5]
-3j, 3j, -59, 5, 1[4 -5 0; 5 -4 0; 0 0 -5]
-3j, 3j, 59, 5, 1[4 -5 0; 5 -4 0; 0 0 5]
-3j, 3j, -59, 5, 1[4 0 -5; 0 -5 0; 5 0 -4]
-3j, 3j, 59, 5, 1[4 0 -5; 0 5 0; 5 0 -4]
-3j, 3j, -59, 5, 1[4 0 5; 0 -5 0; -5 0 -4]
-3j, 3j, 59, 5, 1[4 0 5; 0 5 0; -5 0 -4]
-3j, 3j, -59, 5, 1[4 5 0; -5 -4 0; 0 0 -5]
-3j, 3j, 59, 5, 1[4 5 0; -5 -4 0; 0 0 5]
-3j, 3j, 59, 5, 1[5 0 0; 0 -4 -5; 0 5 4]
-3j, 3j, 59, 5, 1[5 0 0; 0 -4 5; 0 -5 4]
-4j, 4j, 58, 5, 2[5 0 0; 0 -3 -5; 0 5 3]
-4j, 4j, 58, 5, 2[5 0 0; 0 -3 5; 0 -5 3]
-4j, 4j, 58, 5, 2[5 0 0; 0 3 -5; 0 5 -3]
-4j, 4j, 58, 5, 2[5 0 0; 0 3 5; 0 -5 -3]
-3j, 3j, 59, 5, 1[5 0 0; 0 4 -5; 0 5 -4]
-3j, 3j, 59, 5, 1[5 0 0; 0 4 5; 0 -5 -4]