Linear Algebra and the C Language/a0hz

In mathematics, a triangular matrix is a special kind of square matrix. A square matrix is called lower triangular if all the entries above the main diagonal are zero. Similarly, a square matrix is called upper triangular if all the entries below the main diagonal are zero... Wikipedia: Triangular matrix

Multiplying lower triangular matrices

• c00a.c

Multiplying upper triangular matrices

• c00b.c

The inverse of a lower triangular matrix:

• c00c.c

The inverse of an upper triangular matrix:

• c00d.c

Eigenvalues and ​​eigenvectors of a lower triangular matrix:

• c00e.c

Eigenvalues and ​​eigenvectors of a upper triangular matrix:

• c00f.c

Diagonal matrix:

• rdiag_mR();

Lower triangular matrix:

• rlower_mR();

Upper triangular matrix:

• rupper_mR();