Let's say we have a 4x4 matrix that we want to multiply with a vector (a 4x1 matrix).
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。
OK, so let's say I multiply the matrix I with a vector x1, x2, x3. What will the first entry be?
好，我将矩阵i和向量x 1, x 2,x3相乘，第一个元素是什么？
OK, so let's say I multiply the matrix I with a vector x1, x2, x3. What will the first entry be?
好，我将矩阵i和向量x 1, x 2,x3相乘，第一个元素是什么？
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