主题：函数不能在IF THEN FOR循环控制语句中被引用的原理和解决方案

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。
目前有下列函数受此限制:

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

if atrn1<atrn2 and vol>20000 then
begin
    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(CLOSE,1);
MA1:=MA(atrn1,atrn1);
MA2:=MA(atrn2,atrn2);

if atrn1<atrn2 and vol>20000 then
begin
    TR1:= MAX(MAX((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。