如何在LISP中进行while循环 [英] How to do a while loop in LISP

问题描述

我无法通过简单的while循环在Lisp中工作！

I cannot get a simple while loop to work in lisp!

(loop (while (row >= 0))
      setf(row (- row 1))
      (collect (findIndex row col))

当row大于或等于0时，我要减少行并收集findIndex方法给出的结果.假设col已经给出.

while row is more or equal to 0 i want to decrement row and collect the result given by findIndex method. Suppose the col is given.

谢谢！

推荐答案

以下是正确的循环形式:

The correct form of the loop is the following:

(loop while (>= row 0) 
  do (setf row (- row 1))           ; or better: do (decf row)
  collect (findIndex row col))

有关循环语法的详细说明，请参见手册.

For a detailed description of the loop syntax, see the manual.

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