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学会就可以自称精通EXCEL-递归+Scan

  • 2026-04-07 04:55:37
学会就可以自称精通EXCEL-递归+Scan
出一道题目:
有三组数据
原数据,均是正负数交替的数据,想要达到的效果,即为处理后的数据。
规则是:如果当前数是负数,则将当前数和下一个数累加(但不能和上一个数相加),同时把当前数变成0,直到累加的结果出现正数,这一组数据才算结束。
即如上图中的,-3和5,-3变成了0,-3+5=2,则-3和5,变成了0和2。
①那么-3和5这两个数字构成的一组数据,就算结束了。
②紧接着开始-3,2,0.3,1,可以发现,直到-3累加到1的时候,累计的结果变成了0.3,这4个数字组成的数据组才结束。
③或者是像第二组数据,累加到最后,最终累加的结果仍然是负数,那么就停止累加,保留最后的负数结果。
④如果碰见了正数开始的,像第三组数据,直接保留正数,并堆叠下一个正数,但如果最后的数字是负数,仍然保留负数。
①②③④构成了这道题的解题思路。
也就是顺向堆叠负数,直至累计为正数或数据用完。
开始写公式:先上结果

=LET(date,B3:B9,n,COUNTA(date),hs,LAMBDA(hs,idx,IF(idx>n,"",LET(curr,INDEX(date,idx),IF(curr>=0,VSTACK(curr,hs(hs,idx+1)),LET(seq,SEQUENCE(n-idx+1,1,idx,1),acc,SCAN(0,seq,LAMBDA(a,i,a+INDEX(date,i))),pos,IFERROR(MATCH(TRUE,acc>=0,0),0),IF(pos>0,LET(rest,hs(hs,idx+pos),VSTACK(SEQUENCE(pos-1,1,0,0),INDEX(acc,pos),rest)),IFERROR(VSTACK(SEQUENCE(COUNTA(acc)-1,1,0,0),TAKE(acc,-1)),TAKE(acc,-1)))))))),hs(hs,1))

首先:考虑到需要累加,优先的肯定是用scan函数,但是这里的累加,又是分段进行的,因此,肯定要利用sequence函数和Index函数取位置,分别累加。
于是:
定义初始数据的区域(B3:B9),命名为date,定义它的非空数量为n.
自定义一个函数,命名为hs,其中的参数是idx,运算规则是:
首先递归先要写出终止条件:终止条件是,当Idx>n时,则为""
回顾一下n是什么,n是初始数据的数量,也就是当利用Index()取数时,不可能取到的行数超过初始数据的行数,如果超过了,则为"",递归结束。
上述数据源是7行,也就是idx从1开始,当第一次超过7时,则保留为"",然后结束。到了这里,我们已经写到了函数的:

=LET(date,B3:B9,n,COUNTA(date),hs,LAMBDA(hs,idx,IF(idx>n,"",

我们整个函数的思路,是不停的判断原始数据中当前位置是正数还是负数,如果是正数,就保留,如果是负数,进入累加和保留为0的环节。
因此,我们可以在自定义函数中,定义curr,他的值就是取自原始数据的,也就是Index(date,idx),idx,可以想象,就是从1开始不断+1,直到第一次突破7,也就是8结束。
那么当:curr,也就是Index(date,idx)>=0的时候,我们的函数怎么运算那?
是不是就是保留这个curr同时idx+1即可,
因此,vstack(curr,hs(hs,idx+1))

=LET(date,B3:B9,n,COUNTA(date),hs,LAMBDA(hs,idx,IF(idx>n,"",LET(curr,INDEX(date,idx),IF(curr>=0,VSTACK(curr,hs(hs,idx+1)),

此时到了函数的这个部分。

紧接着,就是函数的第二部分,当Curr<0的时候,也就是数据跑着跑着,遇到了一个负数,负数该怎么处理的问题?

负数的思路,其实前面也提到了,就是一个累加的过程,从当前位置开始累加,直到第一个正数,或者是直到行数达到最大值。

因此,我们可以自定义一个序列,seq,

let(seq,SEQUENCE(n-idx+1,1,idx,1),例如,当数据为-3的时候,7-3+1=5,也就是构造成从-3一直到最后一个数据,所需要的行数,列数为1,开始从Idx开始,每次增加1,也就是3,4,5,6,7。

再定义累加的结果为acc,scan(0,seq,lambda(a,i,a+index(date,i))),

也就是把原数据从第三行开始,不断地累加,并保留累加过程。

由此,可以得出一个数据组acc:-3,-1,-0.7,0.3,1.3(以第一组数据为例)

可以看到,我们要的就是0.3这个数字。

下面先拆分第一组数据的结果,即累加中能出现正数。

因此,就要定位到0.3所在位置。所以使用函数match定位

也就是可以在这一层级的Let中,定义一个名称

pos,IFERROR(MATCH(TRUE,acc>=0,0),0)

这时,函数已经写到了:

=LET(date,B3:B9,n,COUNTA(date),hs,LAMBDA(hs,idx,IF(idx>n,"",LET(curr,INDEX(date,idx),IF(curr>=0,VSTACK(curr,hs(hs,idx+1)),LET(seq,SEQUENCE(n-idx+1,1,idx,1),acc,SCAN(0,seq,LAMBDA(a,i,a+INDEX(date,i))),pos,IFERROR(MATCH(TRUE,acc>=0,0),0),

下面再利用sequence构造0的数组,再利用Index取到acc中Pos的位置。

因此就有了下面的函数:

VSTACK(SEQUENCE(pos-1,1,0,0),INDEX(acc,pos)

这里也就是取了3个0,以及一个0.3

效果如下:

但是,我们不要忘了,我们在前面的if中,即Curr<0,这个分类中还没有递归,

我们该怎么递归呢?

可以发现,只有当pos>0的时候,才具有递归的意义,也就是把剩下的值,再套进函数中去运算,因此,也就是

IF(pos>0,LET(rest,hs(hs,idx+pos),VSTACK(SEQUENCE(pos-1,1,0,0),INDEX(acc,pos),rest))

在这个情况下,如果rest都是正数,那么他就会带入前面的If(curr>=0运算,如果是负数,则会继续在这个分支运算

如果Pos=0怎么办那?Pos等于0,就说明,剩下的数据累加都是小于0的值,

这个处理就简单了:直接

VSTACK(SEQUENCE(COUNTA(acc)-1,1,0,0),TAKE(acc,-1))

但是如果只剩下一个数,而且是负数,累加只有一行数,SEQUENCE(pos-1,1,0,0)就会出错,因此只需要前面加一个iferror就可以了~

IFERROR(VSTACK(SEQUENCE(COUNTA(acc)-1,1,0,0),TAKE(acc,-1)),TAKE(acc,-1))

这个处理,也就是第二组数据和第三组数据的结果

这样,整个函数就写完了~

补上所有的括号,注意变量是idx,那么也就是从1开始不停累加即可~

,hs(hs,1))也就对应到了这个,

再回顾一下这道题目递归的逻辑~

从第一行开始判断,如果值是正数,则Idx+1,如果当前行的值是负数,则进入scan函数为主的累加替换过程。

一道突发奇想的题目,需要拥有一定的EXCEL函数功底,~感谢大家支持,欢迎大家关注,点赞和转发,谢谢~

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  1. CONNECT:[ UseTime:0.000383s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000584s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000280s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000259s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000511s ]
  6. SELECT * FROM `set` [ RunTime:0.000416s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000523s ]
  8. SELECT * FROM `article` WHERE `id` = 474302 LIMIT 1 [ RunTime:0.000360s ]
  9. UPDATE `article` SET `lasttime` = 1776038657 WHERE `id` = 474302 [ RunTime:0.000537s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000236s ]
  11. SELECT * FROM `article` WHERE `id` < 474302 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000399s ]
  12. SELECT * FROM `article` WHERE `id` > 474302 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000535s ]
  13. SELECT * FROM `article` WHERE `id` < 474302 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001580s ]
  14. SELECT * FROM `article` WHERE `id` < 474302 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002121s ]
  15. SELECT * FROM `article` WHERE `id` < 474302 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000760s ]
0.081787s