Value since condition

Hi,

Can anyone please help me with this?

I would like to show only the first value since a condition and not subsequent values, which may be separated by variable time periods. Such a formula might be written as:

• where: condition=variable, such as CROSS(EXPR2,EXPR3)
• and, since= any value of expr1 since nth occurence of  condition.

expr1 :=close;

expr2 := expr1(condition) and not anytrue(expr1,since(n,condition,expr1));

expr2;

Unfortunately anytrue can only accept an interger as its second parameter. Is there anyway to return :

• any value of expr1 since condition and,
• pass a variable to the second parameter of anytrue?

Thanks in advance.