BullCharts : newbie programming questions http://www.bullcharts.com.au/forum/ This is an XML content feed of; BullCharts : BullScript : newbie programming questions Copyright (c) 2006-2009 Web Wiz Forums - All Rights Reserved. Wed, 15 Apr 2026 12:02:48 +0000 Wed, 21 Sep 2005 20:37:52 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.bullcharts.com.au/forum/RSS_post_feed.asp?TID=294 BullCharts http://www.bullcharts.com.au/forum/http://www.bullcharts.com.au/images/bull_logo.gif http://www.bullcharts.com.au/forum/ newbie programming questions : for #3, the relative performance... http://www.bullcharts.com.au/forum/forum_posts.asp?TID=294&PID=1059#1059 Author: zorro
Subject: 294
Posted: 21 Sep 2005 at 8:37pm

for #3, the relative performance indicator does something like this]]> Wed, 21 Sep 2005 20:37:52 +0000 http://www.bullcharts.com.au/forum/forum_posts.asp?TID=294&PID=1059#1059 newbie programming questions : Thanks for that - now it all makes... http://www.bullcharts.com.au/forum/forum_posts.asp?TID=294&PID=1057#1057 Author: ukipeter
Subject: 294
Posted: 20 Sep 2005 at 9:18am

Thanks for that - now it all makes sense.

]]> Tue, 20 Sep 2005 09:18:09 +0000 http://www.bullcharts.com.au/forum/forum_posts.asp?TID=294&PID=1057#1057 newbie programming questions : prev just returns the same result... http://www.bullcharts.com.au/forum/forum_posts.asp?TID=294&PID=1055#1055 Author: zorro
Subject: 294
Posted: 19 Sep 2005 at 10:49pm

prev just returns the same result as the previous bar.
eg:
inMarket :=
if (entry, true,
if (takeprofit or stopped, false, prev));

in this case, 'inMarket' is set to true whenever 'entry' is true(entering the market). it is set to false if either takeprofit orstopped is true (exiting the market). and if none of the three signalsare true then the result is unchanged from the previous (if you're in,you stay in; if you're out, you stay out).

]]> Mon, 19 Sep 2005 22:49:12 +0000 http://www.bullcharts.com.au/forum/forum_posts.asp?TID=294&PID=1055#1055 newbie programming questions : I'm just starting with BullScript.... http://www.bullcharts.com.au/forum/forum_posts.asp?TID=294&PID=1048#1048 Author: ukipeter
Subject: 294
Posted: 15 Sep 2005 at 8:11am

I'm just starting with BullScript.  I've been looking through some of the scripts trying to understand how things work.
 
1) prev statement.   I am a bit puzzled how the prev statement works.
 
I have copied some code from the JB Volatility Stop Loss. 
 
I can work most of it out, but I am lost as to what the prev does in the following lines.  Any clues?
 
 
[citation="'Share Traders Handbook', Jim Berg;
'A Winning Combination for Traders', Jim Berg, Leverage July 2004 Issue 32 p15-17 www.leveragemag.com.au"]
[target=Price; author=Berg, Jim; category=Stop Loss|Volatility]
 
In this inMarket statement, what does the 'prev' do in the second if statement?
 
inMarket :=
if (entry, true,
if (takeprofit or stopped, false, prev));
 
jbmode := if (C>r1, 1, if (C<r2, -1, prev) );
 
 
2) From the MACD Tradesim example

{Generated BullScript for "TradeSim Sample Scan" scan}
 
{Condition: return all securities }
filter := true;
filter;
 

{-- Trading System : "Sample MACD System" --}
_var1 := formula("MACD", 12, 26, 9);
_var2 := formula("MACD[2]", 12, 26, 9);
EntryTrigger := (cross(_var1, _var2));
EntryPrice := Open;
ExitTrigger := (cross(_var2, _var1));
ExitPrice := Open;
InitialStop := Low-2*ATR(10);
 
[visible=no]
ExtFml("TradeSim.Initialize");
ExtFml("TradeSim.EnableProtectiveStop",0);
ExtFml("TradeSim.EnableDelayOfEntryByOneBar");
ExtFml("TradeSim.EnableDelayOfAllExitsByOneBar");
ExtFml("TradeSim.EnablePriceFilter");
ExtFml("TradeSim.SetVolumeInfoType",LOWEST);
 
[name="Sample MACD System Trades"; dp=0; visible=yes]
ExtFml("TradeSim.RecordTrades",
 "TradeSim Sample Scan",
 LONG,
 EntryTrigger,
 EntryPrice,
 InitialStop,
 ExitTrigger,
 ExitPrice,
 START);
 
What would you put if you wanted to exit if the opening price went a fixed percentage above your entry price (e.g. 5%)?
 
3) I am looking at comparing the prices with the price at a particular date, so, before that date the indicate would plot 0, after that date, it would plot the ratio of the bar to the bar at a particular date.  For example, I would like to plot
 
Close/ Close("25/03/05")
 
How could I do this?
 
Peter Bloomfield
 
 
 
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