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The FORTRAN level-1 BLAS calls for these operation are

`
`

`
Here is replaced by ``S`, `D`, `C`, or `Z`
to indicate the data type of the operands (single, double, complex, double precision complex).
Parameter `N` equals the length of the vector, *n* .
Parameter `X` equals the
address of where vector *x* starts in
memory. The stride for the vector is given in `INCX`.
The result is returned as the function value.
`
`

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