### MB_DAXPY – Performs y := a*x + y for vectors x,y

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 DAXPY is called internally:

DAXPY(N, a, uX, INCX, uY, INCY);

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

• If the input $\mathtt{\text{n}}>0$ then N is set to n else N is set to the current number of the vector or matrix elements CNTY referenced by uY.
• If the input $\mathtt{\text{incx}}\ne 0$ then INCX is set to incx else INCX is set to $1$.
• If the input $\mathtt{\text{incy}}\ne 0$ 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),
• $\mathtt{\text{n}}<0$,
• $\left(\mathtt{\text{N}}-1\right)\ast \mathtt{\text{|INCX|}}+1>\mathtt{\text{CNTX}}$, where CNTX is a number of the vector or matrix elements referenced by uX,
• $\left(\mathtt{\text{N}}-1\right)\ast \mathtt{\text{|INCY|}}+1>\mathtt{\text{CNTY}}$.

See BLAS documentation [6] for more details.

Inputs

 uX Input reference to vector x Reference uY Input reference to vector y Reference a Scalar coefficient a Double (F64) n Number of processed vector elements  $\odot$0.00E+00 Long(I32) incx Index increment of vector x Long (I32) incy Index increment of vector y 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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