运用c++编写程序实现稀疏矩阵的转置并输出转置后的稀疏矩阵
时间: 2024-10-27 12:01:35 浏览: 26
在C++中,稀疏矩阵通常采用压缩存储的方式,比如COO(Coordinate List,坐标列表)、CSR(Compressed Sparse Row,压缩行存储)或 CSC(Compressed Sparse Column,压缩列存储)等格式。对于转置操作,需要根据不同格式进行相应的转换。
这里以CSR为例,因为它是常用的一种稀疏矩阵表示方法:
```cpp
#include <iostream>
#include <vector>
// 定义稀疏矩阵的结构
struct SparseMatrix {
std::vector<int> row_indices; // 行指针
std::vector<int> col_indices; // 列索引
std::vector<double> values; // 值
};
// 稀疏矩阵转置函数
SparseMatrix transpose_CSR(SparseMatrix& src) {
int n = src.row_indices.size() - 1;
SparseMatrix transposed;
transposed.row_indices.resize(n + 1);
transposed.col_indices.resize(src.values.size());
transposed.values = src.values;
for (int i = 0; i <= n; ++i)
transposed.row_indices[i] = i;
for (int i = 0, j = 0; i <= n; ++i) {
while (src.col_indices[j] != i && j < src.col_indices.size())
++j;
if (j == src.col_indices.size()) break;
transposed.col_indices[j] = src.row_indices[i];
++j;
}
return transposed;
}
// 输出转置后的稀疏矩阵
void print_sparse_matrix(const SparseMatrix& mat) {
for (int i = 0; i <= mat.row_indices.size() - 2; ++i) {
int start = mat.row_indices[i], end = mat.row_indices[i + 1];
std::cout << "Row " << i << ": ";
for (int k = start; k < end; ++k) {
std::cout << mat.col_indices[k] << ": " << mat.values[k] << " ";
}
std::cout << "\n";
}
}
int main() {
// 初始化一个CSR稀疏矩阵...
SparseMatrix sparse;
// ...填充数据...
// 转置
SparseMatrix transposed = transpose_CSR(sparse);
// 输出转置后的稀疏矩阵
print_sparse_matrix(transposed);
return 0;
}
```
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