Input matrix A:
[        2       -7       -1       -8        9       -6        7        1
        -8       10        2        8        3        0       -8      -10
         8       -1        6       -5       -5       -2        3        3
        -9        7        4        8       -8       -5        9       -7
        -7       10       -2       10       -4        2       -8        5 ]

Input vector x:
( -8 3 2 6 7 -6 1 -7 )

Result vector DGEMV:
( 12 229 -126 181 59 )

Result vector naive:
( 12 229 -126 181 59 )

Adding to previous result with beta=2:

Result vector DGEMV:
( 36 687 -378 543 177 )

Result vector naive:
( 36 687 -378 543 177 )