访问 [row, column] 处的元素。
row
和 column
都必须是从 0 到 3(含)的数字。矩阵是 4x4 数字
数组,可以使用此函数访问各个元素。
请注意标准数学表示法 - 行是第一个索引。
访问顺序索引(0..15(含))处的元素。
矩阵是 4x4 数字数组(总共 16 个数字)。在此函数使用
“展平”索引可以访问各个元素。
index
是 row+column*4
。
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