petsc-3.13.6 2020-09-29

VecAXPY

Computes y = alpha x + y.

#include "petscvec.h"   
PetscErrorCode  VecAXPY(Vec y,PetscScalar alpha,Vec x)

Logically Collective on Vec

	alpha	- the scalar
	x, y	- the vectors

y -output vector

x and y MUST be different vectors This routine is optimized for alpha of 0.0, otherwise it calls the BLAS routine

   VecAXPY(y,alpha,x)                   y = alpha x           +      y

   VecAYPX(y,beta,x)                    y =       x           + beta y

   VecAXPBY(y,alpha,beta,x)             y = alpha x           + beta y

   VecWAXPY(w,alpha,x,y)                w = alpha x           +      y

   VecAXPBYPCZ(w,alpha,beta,gamma,x,y)  z = alpha x           + beta y + gamma z

   VecMAXPY(y,nv,alpha[],x[])           y = sum alpha[i] x[i] +      y

intermediate