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Vector.cpp
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Created
Wed, Aug 7, 17:24
Size
1 KB
Mime Type
text/x-c
Expires
Fri, Aug 9, 17:24 (2 d)
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blob
Format
Raw Data
Handle
19601891
Attached To
rLAMMPS lammps
Vector.cpp
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#include "DenseVector.h"
///////////////////////////////////////////////////////////////////////////////
//* performs a matrix-vector multiply with optional transposes BLAS version
void
MultMv
(
const
Matrix
<
double
>
&
A
,
const
Vector
<
double
>
&
v
,
DenseVector
<
double
>
&
c
,
const
bool
At
,
double
a
,
double
b
)
{
static
char
t
[
2
]
=
{
'N'
,
'T'
};
char
*
ta
=
t
+
At
;
int
sA
[
2
]
=
{
A
.
nRows
(),
A
.
nCols
()};
// sizes of A
int
sV
[
2
]
=
{
v
.
size
(),
1
};
// sizes of v
GCK
(
A
,
v
,
sA
[
!
At
]
!=
sV
[
0
],
"MultAB<double>: matrix-vector multiply"
);
if
(
c
.
size
()
!=
sA
[
At
])
{
c
.
resize
(
sA
[
At
]);
// set size of C to final size
c
.
zero
();
}
// get pointers to the matrix sizes needed by BLAS
int
*
M
=
sA
+
At
;
// # of rows in op[A] (op[A] = A' if At='T' else A)
int
*
N
=
sV
+
1
;
// # of cols in op[B]
int
*
K
=
sA
+!
At
;
// # of cols in op[A] or # of rows in op[B]
double
*
pa
=
A
.
get_ptr
(),
*
pv
=
v
.
get_ptr
(),
*
pc
=
c
.
get_ptr
();
#ifdef COL_STORAGE
dgemm_
(
ta
,
t
,
M
,
N
,
K
,
&
a
,
pa
,
sA
,
pv
,
sV
,
&
b
,
pc
,
M
);
#else
dgemm_
(
t
,
ta
,
N
,
M
,
K
,
&
a
,
pv
,
sV
+
1
,
pa
,
sA
+
1
,
&
b
,
pc
,
N
);
#endif
}
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