Symmetric packed matrix-vector multiply

F_SSPMV/F_DSPMV/F_CSPMV/F_ZSPMV

 

INCY

Increment for the array y. A vector y having component

 

 

yi, i = 1,..., n, is stored in an array Y() with increment

 

 

argument incy. If incy > 0 then yiis stored in

 

 

Y(1 + (i - 1) x incy). If incy < 0 then yi is stored in

 

 

Y(1 + (N - i) x incy). incy = 0 is an illegal value.

Output

Y

The updated Y vector replaces the input.

 

 

y ← αAx + βy with A=AT

Chapter 3 Basic Matrix Operations 383