DASUM takes the sum of the absolute values.
N is INTEGER number of elements in input vector(s)
DX is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
INCX is INTEGER storage spacing between elements of DX
Univ. of California Berkeley
Univ. of Colorado Denver
jack dongarra, linpack, 3/11/78. modified 3/93 to return if incx .le. 0. modified 12/3/93, array(1) declarations changed to array(*)
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