Computes singular values of a 2-by-2 triangular matrix.
call slas2( f, g, h, ssmin, ssmax )
call dlas2( f, g, h, ssmin, ssmax )
The routine ?las2 computes the singular values of the 2-by-2 matrix

On return, ssmin is the smaller singular value and SSMAX is the larger singular value.
REAL for slas2
DOUBLE PRECISION for dlas2
The (1,1), (1,2) and (2,2) elements of the 2-by-2 matrix, respectively.
REAL for slas2
DOUBLE PRECISION for dlas2
The smaller and the larger singular values, respectively.
Barring over/underflow, all output quantities are correct to within a few units in the last place (ulps), even in the absence of a guard digit in addition/subtraction. In ieee arithmetic, the code works correctly if one matrix element is infinite. Overflow will not occur unless the largest singular value itself overflows, or is within a few ulps of overflow. Underflow is harmless if it is gradual. Otherwise, results may correspond to a matrix modified by perturbations of size near the underflow threshold.