Language Reference |
DIAG Function |
The DIAG function creates a diagonal matrix. The matrix argument can be either a numeric square matrix or a vector.
If matrix is a square matrix, the DIAG function creates a matrix with diagonal elements equal to the corresponding diagonal elements. All off-diagonal elements in the new matrix are zeros.
If matrix is a vector, the DIAG function creates a matrix with diagonal elements that are the values in the vector. All off-diagonal elements are zeros.
For example, the following statements produce a diagonal matrix by extracting the diagonal elements of a square matrix:
a = {4 3, 2 1}; c = diag(a); print c;
The following statements produce a diagonal matrix by using the elements of a vector:
b = {1 2 3}; d = diag(b); print d;
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