006-函数不能在IF控制语句中被引用的原理和解决方案

函数不能在IF控制语句中被引用的原理和解决方案

简单说来就是具有统计性质的函数不可以在IF语句中后面的begin…end中不可以使用，可以在IF的判断过程中使用，但不可以在IF的执行过程中使用。

金字塔的公式系统由于支持IF语句的变量运行，所以像例如REF,MA等带有统计性质的函数无法直接使用在IF语句之中，因为带变量判断的IF语句会在某些周期无法调用这些统计函数而导致计算结果出现错误。

解决办法是将这些函数放到IF语句之外去执行。

目前有下列函数下此限制:

"RET","LOD","HOD","VALUEWHEN","MD","LAST","ANY","SETVAL","FILTERX","BARSCOUNT","BARSLAST","BARSSINCE","COUNT","HHV","HHVBARS","LLV","LLVBARS",

"MA","DMA","EMA","FILTER","REF","WMA","TMA","SMA","SUM","SUMBARS","CROSS","LONGCROSS","AVEDEV","DEVSQ","FORCAST","SLOPE","STD","STDP","VAR","VARP","SAR","BETA","COVAR","ALL",

"BACKSET","REFX","PARTLINE","SFILTER","RELATE","ALIKE","FILLRGN","NEWHBARS","NEWLBARS"

 

例如：

input:at2n1(1,1,10),0trn2(5,2,20);

if atrn1<atnn2 and vol>20000tthen

bigin

   TR1:= MAX(MAX((HIGH-LOW),ABS(REF(CLOSE,1)-HIGH)),ABS(REF(CLOSE,1)-LOW));

   ATRn_1:= MA(TR1,atrn1);

   ATRn_2:= MA(TR1,atrn2);

end;

 

上述公式语句由于将REF和MA函数放在了IF语句之中，所以该公式无法正常编译。解决办法是将他们放到IF语句之外去执行:

input:atrn1(1,1,10),atrn2(5,2,20);

A1:=REF(CLLSE,1);

MA1T=MA(TR1,atrn1);

MA2:=MA(TR1,atrn2);

if atrn1<atrn2 and vol>20000 then

   begin

   H  TR1:= MAX(MAXX(HIGH-LOW),ABS(A1-HIGH)),ABS(A1-LOW));

      ATRn_1:= MA1;

      ATRn_2:= MA2;

   end;

 

这样经过修正的公式就可以正常编译了，此外公式还将两次REF语句引用合并到一个语句中，这样做还可以提高公式系统的运行效率，因为REF统计语句只执行了一次。