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Allocate.hpp
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Sun, Sep 22, 23:02
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rGOOSEFEM GooseFEM
Allocate.hpp
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/*
(c - GPLv3) T.W.J. de Geus (Tom) | tom@geus.me | www.geus.me | github.com/tdegeus/GooseFEM
*/
#ifndef GOOSEFEM_ALLOCATE_HPP
#define GOOSEFEM_ALLOCATE_HPP
#include "Allocate.h"
namespace
GooseFEM
{
namespace
detail
{
template
<
class
T
,
class
S
>
inline
bool
has_shape_begin
(
const
T
&
t
,
const
S
&
s
)
{
return
s
.
dimension
()
>=
t
.
dimension
()
&&
std
::
equal
(
t
.
shape
().
cbegin
(),
t
.
shape
().
cend
(),
s
.
shape
().
begin
());
}
}
// namespace detail
template
<
size_t
dim
,
size_t
rank
>
inline
void
asTensor
(
const
xt
::
xtensor
<
double
,
dim
>&
arg
,
xt
::
xtensor
<
double
,
dim
+
rank
>&
ret
)
{
using
strides_type
=
typename
xt
::
xtensor
<
double
,
dim
>::
strides_type
::
value_type
;
GOOSEFEM_ASSERT
(
detail
::
has_shape_begin
(
arg
,
ret
));
std
::
array
<
strides_type
,
dim
+
rank
>
ret_strides
;
std
::
copy
(
arg
.
strides
().
begin
(),
arg
.
strides
().
end
(),
ret_strides
.
begin
());
std
::
fill
(
ret_strides
.
begin
()
+
dim
,
ret_strides
.
end
(),
0
);
ret
=
xt
::
strided_view
(
arg
,
ret
.
shape
(),
std
::
move
(
ret_strides
),
0ul
,
xt
::
layout_type
::
dynamic
);
}
template
<
size_t
dim
,
size_t
rank
>
inline
xt
::
xtensor
<
double
,
dim
+
rank
>
AsTensor
(
const
xt
::
xtensor
<
double
,
dim
>&
arg
,
const
std
::
array
<
size_t
,
rank
>&
shape
)
{
std
::
array
<
size_t
,
dim
+
rank
>
ret_shape
;
std
::
copy
(
arg
.
shape
().
begin
(),
arg
.
shape
().
end
(),
ret_shape
.
begin
());
std
::
copy
(
shape
.
begin
(),
shape
.
end
(),
ret_shape
.
begin
()
+
dim
);
xt
::
xtensor
<
double
,
dim
+
rank
>
ret
=
xt
::
empty
<
double
>
(
ret_shape
);
GooseFEM
::
asTensor
<
dim
,
rank
>
(
arg
,
ret
);
return
ret
;
}
template
<
size_t
dim
,
size_t
rank
>
inline
xt
::
xtensor
<
double
,
dim
+
rank
>
AsTensor
(
const
xt
::
xtensor
<
double
,
dim
>&
arg
,
size_t
n
)
{
std
::
array
<
size_t
,
dim
+
rank
>
ret_shape
;
std
::
copy
(
arg
.
shape
().
begin
(),
arg
.
shape
().
end
(),
ret_shape
.
begin
());
std
::
fill
(
ret_shape
.
begin
()
+
dim
,
ret_shape
.
end
(),
n
);
xt
::
xtensor
<
double
,
dim
+
rank
>
ret
=
xt
::
empty
<
double
>
(
ret_shape
);
GooseFEM
::
asTensor
<
dim
,
rank
>
(
arg
,
ret
);
return
ret
;
}
template
<
class
T
>
inline
xt
::
xarray
<
double
>
AsTensor
(
size_t
rank
,
const
T
&
arg
,
const
std
::
vector
<
size_t
>&
shape
)
{
GOOSEFEM_ASSERT
(
rank
==
shape
.
size
());
size_t
dim
=
arg
.
dimension
();
std
::
vector
<
size_t
>
ret_shape
(
dim
+
rank
);
xt
::
dynamic_shape
<
ptrdiff_t
>
ret_strides
(
dim
+
rank
);
std
::
copy
(
arg
.
shape
().
begin
(),
arg
.
shape
().
end
(),
ret_shape
.
begin
());
std
::
copy
(
arg
.
strides
().
begin
(),
arg
.
strides
().
end
(),
ret_strides
.
begin
());
std
::
copy
(
shape
.
begin
(),
shape
.
end
(),
ret_shape
.
begin
()
+
dim
);
std
::
fill
(
ret_strides
.
begin
()
+
dim
,
ret_strides
.
end
(),
0
);
xt
::
xarray
<
double
>
ret
=
xt
::
empty
<
double
>
(
ret_shape
);
ret
=
xt
::
strided_view
(
arg
,
ret
.
shape
(),
std
::
move
(
ret_strides
),
0ul
,
xt
::
layout_type
::
dynamic
);
return
ret
;
}
template
<
class
T
>
inline
xt
::
xarray
<
double
>
AsTensor
(
size_t
rank
,
const
T
&
arg
,
size_t
n
)
{
size_t
dim
=
arg
.
dimension
();
using
strides_type
=
typename
T
::
strides_type
::
value_type
;
std
::
vector
<
size_t
>
ret_shape
(
dim
+
rank
);
xt
::
svector
<
strides_type
>
ret_strides
(
dim
+
rank
);
std
::
copy
(
arg
.
shape
().
begin
(),
arg
.
shape
().
end
(),
ret_shape
.
begin
());
std
::
copy
(
arg
.
strides
().
begin
(),
arg
.
strides
().
end
(),
ret_strides
.
begin
());
std
::
fill
(
ret_shape
.
begin
()
+
dim
,
ret_shape
.
end
(),
n
);
std
::
fill
(
ret_strides
.
begin
()
+
dim
,
ret_strides
.
end
(),
0
);
xt
::
xarray
<
double
>
ret
=
xt
::
empty
<
double
>
(
ret_shape
);
ret
=
xt
::
strided_view
(
arg
,
ret
.
shape
(),
std
::
move
(
ret_strides
),
0ul
,
xt
::
layout_type
::
dynamic
);
return
ret
;
}
inline
xt
::
xtensor
<
double
,
2
>
as3d
(
const
xt
::
xtensor
<
double
,
2
>&
data
)
{
GOOSEFEM_ASSERT
(
data
.
shape
(
1
)
>
0
&&
data
.
shape
(
1
)
<
4
)
if
(
data
.
shape
(
1
)
==
3ul
)
{
return
data
;
}
xt
::
xtensor
<
double
,
2
>
ret
=
xt
::
zeros
<
double
>
(
std
::
array
<
size_t
,
2
>
{
data
.
shape
(
0
),
3ul
});
if
(
data
.
shape
(
1
)
==
2ul
)
{
xt
::
view
(
ret
,
xt
::
all
(),
xt
::
keep
(
0
,
1
))
=
data
;
}
if
(
data
.
shape
(
1
)
==
1ul
)
{
xt
::
view
(
ret
,
xt
::
all
(),
xt
::
keep
(
0
))
=
data
;
}
return
ret
;
}
}
// namespace GooseFEM
#endif
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