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Java/DataStructures/Matrix/Matrix.java at master · khacdinh/Java · GitHub
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Matrix.java
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Matrix
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Matrix.java
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/**
* Matrix data-type.
*
* @author Kyler Smith, 2017
*/
public
class
Matrix
{
public
static
void
main
(
String
[]
args
) {
int
[][]
data1
=
new
int
[
0
][
0
];
int
[][]
data2
= {{
1
,
2
,
3
}, {
4
,
5
,
6
}, {
7
,
8
,
9
}};
int
[][]
data3
= {{
1
,
4
,
7
}, {
2
,
5
,
8
}, {
3
,
6
,
9
}};
Matrix
m1
=
new
Matrix
(
data1
);
Matrix
m2
=
new
Matrix
(
data2
);
Matrix
m3
=
new
Matrix
(
data3
);
System
.
out
.
println
(
"m1 --> Rows: "
+
m1
.
getRows
() +
" Columns: "
+
m1
.
getColumns
());
System
.
out
.
println
(
"m2 --> Rows: "
+
m2
.
getRows
() +
" Columns: "
+
m2
.
getColumns
());
System
.
out
.
println
(
"m3 --> Rows: "
+
m3
.
getRows
() +
" Columns: "
+
m3
.
getColumns
());
//check for reference issues
System
.
out
.
println
(
"m2 -->
\n
"
+
m2
);
data2
[
1
][
1
] =
101
;
System
.
out
.
println
(
"m2 -->
\n
"
+
m2
);
//test equals
System
.
out
.
println
(
"m2==null: "
+
m2
.
equals
(
null
));
//false
System
.
out
.
println
(
"m3==
\"
MATRIX
\"
: "
+
m2
.
equals
(
"MATRIX"
));
//false
System
.
out
.
println
(
"m2==m1: "
+
m2
.
equals
(
m1
));
//false
System
.
out
.
println
(
"m2==m2: "
+
m2
.
equals
(
m2
));
//true
System
.
out
.
println
(
"m2==m3: "
+
m2
.
equals
(
m3
));
//false
//test operations (valid)
System
.
out
.
println
(
"2 * m2:
\n
"
+
m2
.
scale
(
2
));
System
.
out
.
println
(
"m2 / 2:
\n
"
+
m2
.
divide
(
2
));
System
.
out
.
println
(
"m2 + m3:
\n
"
+
m2
.
plus
(
m3
));
System
.
out
.
println
(
"m2 - m3:
\n
"
+
m2
.
minus
(
m3
));
System
.
out
.
println
(
"m2 * m3:
\n
"
+
m2
.
multiply
(
m3
));
}
/**
* Data needs to be a deep copy as not to change the original state.
*/
private
int
[][]
data
;
/**
* Constructor for the matrix takes in a 2D array
*
* @param pData
*/
public
Matrix
(
int
[][]
pData
) {
/** Make a deep copy of the data */
if
(
pData
.
length
!=
0
) {
int
[][]
newData
=
new
int
[
pData
.
length
][
pData
[
0
].
length
];
for
(
int
i
=
0
;
i
<
pData
.
length
;
i
++)
for
(
int
j
=
0
;
j
<
pData
[
0
].
length
;
j
++)
newData
[
i
][
j
] =
pData
[
i
][
j
];
this
.
data
=
newData
;
}
else
{
this
.
data
=
null
;
}
}
/**
* Returns the element specified by the given location
*
* @param x : x cooridinate
* @param y : y cooridinate
* @return int : value at location
*/
public
int
getElement
(
int
x
,
int
y
) {
return
data
[
x
][
y
];
}
/**
* Returns the number of rows in the Matrix
*
* @return rows
*/
public
int
getRows
() {
if
(
this
.
data
==
null
)
return
0
;
return
data
.
length
;
}
/**
* Returns the number of rows in the Matrix
*
* @return columns
*/
public
int
getColumns
() {
if
(
this
.
data
==
null
)
return
0
;
return
data
[
0
].
length
;
}
/**
* Returns this matrix scaled by a factor. That is, computes sA where s is a
* constant and A is a matrix (this object).
*
* @param scalar : value to scale by
* @return A new matrix scaled by the scalar value
*/
public
Matrix
scale
(
int
scalar
) {
int
[][]
newData
=
new
int
[
this
.
data
.
length
][
this
.
data
[
0
].
length
];
for
(
int
i
=
0
;
i
<
this
.
getRows
(); ++
i
)
for
(
int
j
=
0
;
j
<
this
.
getColumns
(); ++
j
)
newData
[
i
][
j
] =
this
.
data
[
i
][
j
] *
scalar
;
return
new
Matrix
(
newData
);
}
/**
* Returns this matrix divided by a factor. That is, computes sA where s is a
* constant and A is a matrix (this object).
*
* @param scalar : value to divide by
* @return A new matrix scaled by the scalar value
*/
public
Matrix
divide
(
int
scalar
) {
int
[][]
newData
=
new
int
[
this
.
data
.
length
][
this
.
data
[
0
].
length
];
for
(
int
i
=
0
;
i
<
this
.
getRows
(); ++
i
)
for
(
int
j
=
0
;
j
<
this
.
getColumns
(); ++
j
)
newData
[
i
][
j
] =
this
.
data
[
i
][
j
] /
scalar
;
return
new
Matrix
(
newData
);
}
/**
* Adds this matrix to another matrix.
*
* @param other : Matrix to be added
* @return addend
*/
public
Matrix
plus
(
Matrix
other
)
throws
RuntimeException
{
int
[][]
newData
=
new
int
[
this
.
data
.
length
][
this
.
data
[
0
].
length
];
if
(
this
.
getRows
() !=
other
.
getRows
() ||
this
.
getColumns
() !=
other
.
getColumns
())
throw
new
RuntimeException
(
"Not the same size matrix."
);
for
(
int
i
=
0
;
i
<
this
.
getRows
(); ++
i
)
for
(
int
j
=
0
;
j
<
this
.
getColumns
(); ++
j
)
newData
[
i
][
j
] =
this
.
data
[
i
][
j
] +
other
.
getElement
(
i
,
j
);
return
new
Matrix
(
newData
);
}
/**
* Subtracts this matrix from another matrix.
*
* @param other : Matrix to be subtracted
* @return difference
*/
public
Matrix
minus
(
Matrix
other
)
throws
RuntimeException
{
int
[][]
newData
=
new
int
[
this
.
data
.
length
][
this
.
data
[
0
].
length
];
if
(
this
.
getRows
() !=
other
.
getRows
() ||
this
.
getColumns
() !=
other
.
getColumns
())
throw
new
RuntimeException
(
"Not the same size matrix."
);
for
(
int
i
=
0
;
i
<
this
.
getRows
(); ++
i
)
for
(
int
j
=
0
;
j
<
this
.
getColumns
(); ++
j
)
newData
[
i
][
j
] =
this
.
data
[
i
][
j
] -
other
.
getElement
(
i
,
j
);
return
new
Matrix
(
newData
);
}
/**
* Multiplies this matrix with another matrix.
*
* @param other : Matrix to be multiplied with
* @return product
*/
public
Matrix
multiply
(
Matrix
other
)
throws
RuntimeException
{
int
[][]
newData
=
new
int
[
this
.
data
.
length
][
other
.
getColumns
()];
if
(
this
.
getColumns
() !=
other
.
getRows
())
throw
new
RuntimeException
(
"The two matrices cannot be multiplied."
);
int
sum
;
for
(
int
i
=
0
;
i
<
this
.
getRows
(); ++
i
)
for
(
int
j
=
0
;
j
<
other
.
getColumns
(); ++
j
){
sum
=
0
;
for
(
int
k
=
0
;
k
<
this
.
getColumns
();++
k
){
sum
+=
this
.
data
[
i
][
k
] *
other
.
getElement
(
k
,
j
);
}
newData
[
i
][
j
] =
sum
;
}
return
new
Matrix
(
newData
);
}
/**
* Checks if the matrix passed is equal to this matrix
*
* @param other : the other matrix
* @return boolean
*/
public
boolean
equals
(
Matrix
other
) {
return
this
==
other
;
}
/**
* Returns the Matrix as a String in the following format
*
* [ a b c ] ...
* [ x y z ] ...
* [ i j k ] ...
* ...
*
* @return Matrix as String
* TODO: Work formatting for different digit sizes
*/
public
String
toString
() {
String
str
=
""
;
for
(
int
i
=
0
;
i
<
this
.
data
.
length
;
i
++) {
str
+=
"[ "
;
for
(
int
j
=
0
;
j
<
this
.
data
[
0
].
length
;
j
++) {
str
+=
data
[
i
][
j
];
str
+=
" "
;
}
str
+=
"]"
;
str
+=
"
\n
"
;
}
return
str
;
}
/**
* Returns transposed matrix of this matrix.
*
* @return transposed Matrix.
*/
public
Matrix
transpose
() {
int
[][]
newData
=
new
int
[
this
.
data
[
0
].
length
][
this
.
data
.
length
];
for
(
int
i
=
0
;
i
<
this
.
getColumns
(); ++
i
)
for
(
int
j
=
0
;
j
<
this
.
getRows
(); ++
j
)
newData
[
i
][
j
] =
this
.
data
[
j
][
i
];
return
new
Matrix
(
newData
);
}
}
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