A functional index incurs the additional cost of function execution.

函数索引还会产生额外的函数执行开销。

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As you can see, the syscall function includes as its first argument the index of the system call table to use.

正如您所见，syscall函数使用了系统调用表中使用的索引作为第一个参数。

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The position() function returns the one-based index of the node within the node set.

position() 函数返回节点集中节点的基于 1 的索引。

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But is the recent gyration in oil prices a function of supply and demand or is it a sudden rush in or out of commodity index funds?

FORBES: Oil and Natural Gas Part Ways