[amibroker] Logarithmic scales

["andy_kovacs" <andy_kovacs@xxxxxxxxxxx>]

Tomasz - 

Some time back someone posted an excelent piece of trailing stop 
code "ATR BASED STOPS with JScript" which I have included in my 
systems. In the tests I did, this code gave better results than the 
in-built function, so I kept using it rather than re-coding using 
the applystop function.

My default for graph display in preferences is Logarithmic, but I 
dont actually draw the "price" indicator on the chart; I use plot
(c,"Name of System: close=",colorblack,stylebar); This means I have 
to tick the box "logarithmnic" in the gridlines part of the 
indicator window to get a logarithmic display.

When the longstop and shortstop (the results of the java functions) 
are plotted either side of the price, the graph is crammed right at 
the top of the page and the scale starts from zero instead of some 
value near the minimum of the price range. As the graphs before were 
normal, I hadnt noticed, but Ive just tested a few codes and each 
time I use the java trailing stop code the graph re-sets itself to 
start from zero in both normal and logarithmic mode (as set in 
indicator window, NOT preferences). 

When I edit out the plot(longstop,"etc........) and change the 
indicator window back to normal (untick box) the graph is still 
plotted from zero, but it looks fine. Just in log mode it squashes 
up at the top of the page and becomes unusable. 

Is this normal? Am I doing something wrong somewhere or is it a 
quirk of the program?

Heres the code for the stops, but I guess you already know it....

//********** ATR BASED STOPS with JScript *********//

EnableScript("jscript");

//first the raw stop functions are defined based on ATR-depending 
distance to the close price

range = multiplier*ATR(Len);
rawlongstop=C-range; //raw long stop
rawshortstop=C+range; //raw short stop

//two JScript functions for the stops are defined
<%
//function for the longstop
function f_longstop(rawstop,baseprice,Length){

//"importing" the AFL functions into JScript
Len = AFL(Length);
Ls=VBArray(AFL(rawstop)).toArray();
bp = VBArray(AFL(baseprice)).toArray();

//the stop is calculated in the loop
for(i=Len+1;i<Ls.length;i++){
if(bp[i]>=Ls[i-1]){Ls[i]=Math.max(Ls[i],Ls[i-1]);}
}

return Ls;
}

//function for the shortstop
function f_shortstop(rawstop,baseprice,Length){
//"importing" the AFL functions into JScript
Len = AFL(Length);
Ss=VBArray(AFL(rawstop)).toArray();
bp = VBArray(AFL(baseprice)).toArray();

//the stop is calculated in the loop
for(i=Len+1;i<Ss.length;i++){
if(bp[i]<=Ss[i-1]){Ss[i]=Math.min(Ss[i],Ss[i-1]);}
}
return Ss;
}
%>
//*********** End of JScript *****************//


Andy



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