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Tue, Apr 30, 17:51
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Thu, May 2, 17:51 (2 d)
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DoubleMatrix2x2.cpp
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/*
* DoubleMatrix2x2.cpp
*
* Created on: Oct 21, 2012
* Author: radu
*/
#include "DoubleMatrix2x2.hpp"
DoubleMatrix2x2
::
DoubleMatrix2x2
()
{
mMatrix
[
0
]
=
0.0
;
mMatrix
[
1
]
=
0.0
;
mMatrix
[
2
]
=
0.0
;
mMatrix
[
3
]
=
0.0
;
}
DoubleMatrix2x2
::~
DoubleMatrix2x2
()
{}
DoubleMatrix2x2
::
DoubleMatrix2x2
(
const
double
m11
,
const
double
m12
,
const
double
m21
,
const
double
m22
)
{
mMatrix
[
0
]
=
m11
;
mMatrix
[
1
]
=
m12
;
mMatrix
[
2
]
=
m21
;
mMatrix
[
3
]
=
m22
;
}
DoubleMatrix2x2
::
DoubleMatrix2x2
(
const
DoubleMatrix2x2
&
m
)
{
mMatrix
[
0
]
=
m
.
Get
(
0
,
0
);
mMatrix
[
1
]
=
m
.
Get
(
0
,
1
);
mMatrix
[
2
]
=
m
.
Get
(
1
,
0
);
mMatrix
[
3
]
=
m
.
Get
(
1
,
1
);
}
double
DoubleMatrix2x2
::
Get
(
const
int
i
,
const
int
j
)
const
{
return
mMatrix
[
2
*
i
+
j
];
}
double
DoubleMatrix2x2
::
Determinant
()
const
{
return
mMatrix
[
0
]
*
mMatrix
[
3
]
-
mMatrix
[
1
]
*
mMatrix
[
2
];
}
DoubleMatrix2x2
DoubleMatrix2x2
::
Inverse
()
const
{
double
det
=
Determinant
();
if
(
det
==
0
)
{
std
::
cout
<<
"The determinant is 0. Returning an zero matrix"
<<
std
::
endl
;
return
DoubleMatrix2x2
();
}
else
{
return
DoubleMatrix2x2
(
Get
(
1
,
1
)
/
det
,
-
Get
(
0
,
1
)
/
det
,
-
Get
(
1
,
0
)
/
det
,
Get
(
0
,
0
)
/
det
);
}
}
DoubleMatrix2x2
&
DoubleMatrix2x2
::
operator
=
(
const
DoubleMatrix2x2
&
m
)
{
mMatrix
[
0
]
=
m
.
Get
(
0
,
0
);
mMatrix
[
1
]
=
m
.
Get
(
0
,
1
);
mMatrix
[
2
]
=
m
.
Get
(
1
,
0
);
mMatrix
[
3
]
=
m
.
Get
(
1
,
1
);
return
*
this
;
}
DoubleMatrix2x2
DoubleMatrix2x2
::
operator
-
()
const
{
return
DoubleMatrix2x2
(
-
mMatrix
[
0
],
-
mMatrix
[
1
],
-
mMatrix
[
2
],
-
mMatrix
[
3
]);
}
DoubleMatrix2x2
DoubleMatrix2x2
::
operator
+
(
const
DoubleMatrix2x2
&
m
)
const
{
return
DoubleMatrix2x2
(
mMatrix
[
0
]
+
m
.
Get
(
0
,
0
),
mMatrix
[
1
]
+
m
.
Get
(
0
,
1
),
mMatrix
[
2
]
+
m
.
Get
(
1
,
0
),
mMatrix
[
3
]
+
m
.
Get
(
1
,
1
));
}
DoubleMatrix2x2
DoubleMatrix2x2
::
operator
-
(
const
DoubleMatrix2x2
&
m
)
const
{
return
DoubleMatrix2x2
(
mMatrix
[
0
]
-
m
.
Get
(
0
,
0
),
mMatrix
[
1
]
-
m
.
Get
(
0
,
1
),
mMatrix
[
2
]
-
m
.
Get
(
1
,
0
),
mMatrix
[
3
]
-
m
.
Get
(
1
,
1
));
}
void
DoubleMatrix2x2
::
Multiply
(
const
double
d
)
{
mMatrix
[
0
]
*=
d
;
mMatrix
[
1
]
*=
d
;
mMatrix
[
2
]
*=
d
;
mMatrix
[
3
]
*=
d
;
}
std
::
ostream
&
operator
<<
(
std
::
ostream
&
output
,
const
DoubleMatrix2x2
&
m
)
{
output
<<
m
.
mMatrix
[
0
]
<<
" "
<<
m
.
mMatrix
[
1
]
<<
std
::
endl
;
output
<<
m
.
mMatrix
[
2
]
<<
" "
<<
m
.
mMatrix
[
3
];
return
output
;
}
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