MB_DNRM2 – Euclidean norm of a vector

Block SymbolLicensing group: STANDARD

Function Description
The output reference yX is always set to the input reference uX. If HLD = on then nothing is computed otherwise the BLAS function DNRM2 is called internally:

value = DNRM2(N, uX, INCX);

where the values N and INCX are set in the following way:

If the input $n > 0$ then N is set to n else N is set to the current number of the vector or matrix elements CNT referenced by uX.
If the input $incx > 0$ then INCX is set to incx else INCX is set to $1$ .

The error flag E is set to on if:

the reference uX is not defined (i.e. input uX is not connected),
$n < 0$ or $incx < 0$ ,
$(N - 1) * |INCX| + 1 > CNT$ .

See BLAS documentation [6] for more details.

Use the block ML_DLANGE for computation of various norms of a matrix.

Inputs

uX	Input reference to vector x	Reference
n	Number of processed vector elements $⊙$ 0.00E+00	Long(I32)
incx	Index increment of vector x $⊙$ 0.00E+00	Long(I32)
HLD	Hold	Bool

Outputs

yX	Output reference to vector x	Reference
value	Return value of the function	Double (F64)
E	Error indicator	Bool

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