what is no-op (no operation)

本文介绍了计算机指令中的noop(无操作)指令,它占用少量空间但不执行任何操作,仅使处理器跳转到下一条指令。在汇编语言中常用作占位符,在代码开发过程中预留位置供后续插入有用指令。

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A no op (or no-op), for no operation , is a computer instruction that takes up a small amount of space but specifies(指定) no operation.

The computer processor(中央处理器) simply moves to the next sequential instruction. 

The no op is included in most assembler(汇编) languages.

 It may have a label and can serve as a placeholder for a useful instruction to be inserted later during code development.

`integrate-series-tail` is a function used in the definition of stream-based power series expansions. It takes a stream representing the coefficients of a power series, and returns a new stream representing the coefficients of the antiderivative of that series. Here's the definition of `integrate-series-tail`: ``` (define (integrate-series-tail s) (stream-cons 0 (add-series-tail (scale-series-tail s 1/2) (integrate-series-tail (stream-cdr s))))) ``` The function first creates a new stream with a leading coefficient of 0, since the antiderivative of a power series has no constant term. It then uses two other functions, `add-series-tail` and `scale-series-tail`, to combine and manipulate the coefficients of the input stream. `add-series-tail` takes two streams representing power series, and returns a new stream representing the sum of those series. `scale-series-tail` takes a stream representing a power series, and a scalar value, and returns a new stream representing the series with each coefficient multiplied by that scalar. In the definition of `integrate-series-tail`, we use `scale-series-tail` to multiply the input stream by `1/2`, since the antiderivative of a power series is obtained by dividing each coefficient of the original series by the corresponding power of the variable. We then use `add-series-tail` to combine this scaled stream with the recursively computed antiderivative of the tail of the input stream. This recursive computation of the antiderivative of the tail of the input stream is what allows us to generate the coefficients of the power series for the antiderivative. By repeatedly integrating the series, we can generate the coefficients of the power series for any number of antiderivatives of the original function.
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