MB_DSWAP – Interchanges two vectors

Block SymbolLicensing group: STANDARD

Function Description
The output references yX and yY are always set to the corresponding input references uX and uY. If HLD = on then nothing is computed otherwise the BLAS function DSWAP is called internally:

DSWAP(N, uX, INCX, uY, INCY);

where the values N, INCX and INCY 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 CNTX referenced by uX.
If the input $incx \neq 0$ then INCX is set to incx else INCX is set to $1$ .
If the input $incy \neq 0$ then INCY is set to incy else INCY is set to $1$ .

The error flag E is set to on if:

the reference uX or uY is not defined (i.e. input uX or uY is not connected),
$n < 0$ ,
$(N - 1) * |INCX| + 1 > CNTX$ ,
$(N - 1) * |INCY| + 1 > CNTY$ , where CNTY is a number of the vector or matrix elements referenced by uY.

See BLAS documentation [6] for more details.

Inputs

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

Outputs

yX	Output reference to vector x	Reference
yY	Output reference to vector y	Reference
E	Error indicator	Bool

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