BullScript: Value since condition

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Value since condition

Printed From: BullCharts Forum
Category: BullCharts
Forum Name: BullScript
Forum Discription: Technical discussion related specifically to the BullScript programming language.
URL: http://www.bullcharts.com.au/forum/forum_posts.asp?TID=367
Printed Date: 05 Apr 2025 at 12:33pm
Software Version: Web Wiz Forums 9.69 - http://www.webwizforums.com

Topic: Value since condition

Posted By: matt
Subject: Value since condition
Date Posted: 30 Jun 2006 at 4:04pm

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.

Replies:

Posted By: chart rider
Date Posted: 30 Jun 2006 at 8:29pm

Matt

When I read the first line of your post, I thought I understood the question, but then the next few lines confused me.

Can you give an example of what you are trying to do.

Posted By: matt
Date Posted: 03 Jul 2006 at 5:12pm

CB,

Basically I want to show a marker on the first value triggered by a set of criteria since a specific condition. The criteria (and therefore marker) may occur multiple times after the condition and at varying time periods, however i want to show only the first occurrence. Sorry for being unclear previously.

Matt

Posted By: chart rider
Date Posted: 04 Jul 2006 at 5:27pm

matt

example:

1. The condition required: EMA 20 is above EMA 50

2. The criteria: Close crosses the EMA 10

The following code will identify the first time the criteria is met each time the condition is true:

condition := ma(C, 20, E) > ma(C, 50, E);

criteria := condition and cross(C, ma(C, 10, E));

criteriaSet := if(criteria, 1, max(prev and condition, 0));

criteriaMarker := criteriaSet and hist(criteriaSet,1)=0;

[linestyle=bar; width=2]

criteriaMarker;

Posted By: matt
Date Posted: 04 Jul 2006 at 9:54pm

Thanks CR but this will return the 1st marker only if the condition is met on consecutive bars. A condition (e.g. if the slope of a linear regression line over 3 bars[expr1] > 0 [cond2] and I wish to show only the first occurrence of this after crossing a moving average of 200 bars [cond1]) this might occur intermittently as the price varies up and down and triggering markers separated by variable no.s of bars. So the problem arises when using "hist(criteriaSet,n)=0, if condition2 occurs more than once after condition1 is met but not exactly n bars from its first occurrence then it will trigger another marker.

If I could write;

not anytrue(cond2,barssince(n,cond1,expr1));

then the problem should be solved, however anytrue only acccepts an integer as its second variable. Maybe the only way around this problem is for some BC staff wizard to rework the anytrue code.

Anyway thanks for your time so far, if you can think of any other ideas I'd appreciate it.

Regards,

Matt