python - Python中APL的编码/解码等价物

Answer 1

虽然我不知道 Python，但我知道 APL，并且基于这些知识，我认为这些方法可以解决问题：

从数组索引转换为平面索引

arrayShape = [4, 5, 2, 11]
strides = [5×2×11, 2×11, 11, 1] = [110, 22, 11, 1] 
arrayIndex = [1, 2, 1, 3]
flatIndex = ∑[1×110, 2×22, 1×11, 3×1] = 168

从平面索引转换为数组索引

arrayShape = [4, 5, 2, 11]
strides = [5×2×11, 2×11, 11, 1] = [110, 22, 11, 1] 
flatIndex = 168
How many times can we subtract 110? 1, using 110 with remainder 58
How many times can we subtract  22? 2, using  44 with remainder 14
How many times can we subtract  11? 1, using  11 with remainder 3
How many times can we subtract   1? 3, using   3 with no remainder
arrayIndex = [1, 2, 1, 3]