BLAS/SRC/snrm2.f90(3)      Library Functions Manual      BLAS/SRC/snrm2.f90(3)

NAME
       BLAS/SRC/snrm2.f90

SYNOPSIS
   Functions/Subroutines
       real(wp) function snrm2 (n, x, incx)
           SNRM2

Function/Subroutine Documentation
   real(wp) function snrm2 (integer n, real(wp), dimension(*) x, integer incx)
       SNRM2

       Purpose:


           !>
           !> SNRM2 returns the euclidean norm of a vector via the function
           !> name, so that
           !>
           !>    SNRM2 := sqrt( x'*x ).
           !>

       Parameters
           N

           !>          N is INTEGER
           !>         number of elements in input vector(s)
           !>

           X

           !>          X is REAL array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
           !>

           INCX

           !>          INCX is INTEGER, storage spacing between elements of X
           !>          If INCX > 0, X(1+(i-1)*INCX) = x(i) for 1 <= i <= n
           !>          If INCX < 0, X(1-(n-i)*INCX) = x(i) for 1 <= i <= n
           !>          If INCX = 0, x isn't a vector so there is no need to call
           !>          this subroutine.  If you call it anyway, it will count x(1)
           !>          in the vector norm N times.
           !>

       Author
           Edward Anderson, Lockheed Martin

       Date
           August 2016

       Contributors:
           Weslley Pereira, University of Colorado Denver, USA

       Further Details:


           !>
           !>  Anderson E. (2017)
           !>  Algorithm 978: Safe Scaling in the Level 1 BLAS
           !>  ACM Trans Math Softw 44:1--28
           !>  https://doi.org/10.1145/3061665
           !>
           !>  Blue, James L. (1978)
           !>  A Portable Fortran Program to Find the Euclidean Norm of a Vector
           !>  ACM Trans Math Softw 4:15--23
           !>  https://doi.org/10.1145/355769.355771
           !>
           !>

       Definition at line 88 of file snrm2.f90.

Author
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LAPACK                          Version 3.12.0           BLAS/SRC/snrm2.f90(3)