要避免任何数与 0 相除或溢出，将所有除法转换为乘法并检查运算符号（Y2=Y1 的水平线不会计入算法）

To avoid any division by zero or overflow, transform all division into multiplication and check for the sign (horizontal lines with Y2=Y1 do not count in the algorithm)

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假设有一个4x4的矩阵，我们希望将其与另外一个4x1的向量进行乘法操作。

Let's say we have a 4x4 matrix that we want to multiply with a vector (a 4x1 matrix).

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使用MPI进行并行编程来实现矩阵与向量的乘法。

Parallel programming using MPI to multiply a matrix by a vector.

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