28 lines
475 B
Markdown
28 lines
475 B
Markdown
# Matrix3::operator[]
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```cpp
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float* operator[](int row)
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const float* operator[](int row) const
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```
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访问矩阵指定行的元素。
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**参数：**
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- `row` - 行索引（0-2）
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**返回：** `float*` / `const float*` - 指向该行首元素的指针
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**复杂度：** O(1)
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**示例：**
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```cpp
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Matrix3 m;
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m[0][0] = 1; m[0][1] = 2; m[0][2] = 3;
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m[1][0] = 4; m[1][1] = 5; m[1][2] = 6;
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m[2][0] = 7; m[2][1] = 8; m[2][2] = 9;
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// 访问元素
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float val = m[1][2]; // 6
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```
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