MB_DNRM2 – Euclidean norm of a vector

Block SymbolLicensing group: STANDARD
PIC

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

Long (I32)

incx

Index increment of vector x

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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