有關K值小於20

XQ團隊您好：

我想要寫一個策略是「K值過去十天有3天或3天以上小於20」在這個時候進場，程式碼如下：

input: Length(9) ;

inputay(10);

input:ratio(0.3);

setinputname(1,"KD期數");

settotalbar(300);

setbarback(50);

variable:rsv1(0),k1(0),d1(0),Kprice(0);//KD

stochastic(length,3,3,rsv1,k1,d1);

value1= k1-20;

variable:count(0);

variable:xi(0);

for xi= 1 to day

begin

//============================================

switch(value1[xi])

begin

case < 0:

count=count+1;

case >0:

count=count;

case 0:

count=count;

end;

//============================================

end;

if day<>0 and count/day>=ratio

then ret=1;

但無法正確的進場，想請問正確的寫法，謝謝。