matlab中如何提取稀疏矩阵中元素的坐标
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matlab中如何提取稀疏矩阵中元素的坐标
矩阵A=[0,0,1,1;1,0,0,1;0,1,1,0],如何扫描提取值为1的全部元素的坐标?
矩阵A=[0,0,1,1;1,0,0,1;0,1,1,0],如何扫描提取值为1的全部元素的坐标?
![matlab中如何提取稀疏矩阵中元素的坐标](/uploads/image/z/17987093-53-3.jpg?t=matlab%E4%B8%AD%E5%A6%82%E4%BD%95%E6%8F%90%E5%8F%96%E7%A8%80%E7%96%8F%E7%9F%A9%E9%98%B5%E4%B8%AD%E5%85%83%E7%B4%A0%E7%9A%84%E5%9D%90%E6%A0%87)
如果是简单矩阵的话:
>> A=[0,0,1,1;1,0,0,1;0,1,1,0]
A =
0 0 1 1
1 0 0 1
0 1 1 0
>> [ i, j ] = find( A == 1 )
i =
2
3
1
3
1
2
j =
1
2
3
3
4
4
如果是稀疏矩阵的话:
>> S = sparse( A )
S =
(2,1) 1
(3,2) 1
(1,3) 1
(3,3) 1
(1,4) 1
(2,4) 1
>> [ i, j ] = find( S )
i =
2
3
1
3
1
2
j =
1
2
3
3
4
4
>> A=[0,0,1,1;1,0,0,1;0,1,1,0]
A =
0 0 1 1
1 0 0 1
0 1 1 0
>> [ i, j ] = find( A == 1 )
i =
2
3
1
3
1
2
j =
1
2
3
3
4
4
如果是稀疏矩阵的话:
>> S = sparse( A )
S =
(2,1) 1
(3,2) 1
(1,3) 1
(3,3) 1
(1,4) 1
(2,4) 1
>> [ i, j ] = find( S )
i =
2
3
1
3
1
2
j =
1
2
3
3
4
4