Viewing percent change in Y-axis possible?

[shaeffer]

Can the Y axis of an Adv chart be set to view percent change? Or maybe an efs has been written to allow this (on an intraday chart)?

Thanks
shaeffer

[ACM]

shaeffer
AFAIK you cannot set the price scale to percent change.
The enclosed script will calculate the percent change on an intraday chart
Alex

function preMain() {
    setPriceStudy(false);
    setStudyTitle("Percent Change");
    setCursorLabelName("%Chng");
    addBand(0,PS_SOLID,1,Color.black);
}

var vClose = null;

function main(Time,Price) {

    vClose = call("/OHLC/getPrevOHLC.efs","Close");

    if(vClose==null) return;
    
    var vPerChng= ((close()-vClose)/vClose)*100;

    return vPerChng;
} 

[shaeffer]

Hi Alex

The link below allows comparison of relative strength of major Nasdaq sectors, on a daily basis.
http://stockcharts.com/webcgi/perf.html?$SOX,$COMPQ,$BTK,$DOT,$NWX,$GHA,$GSO,$DRG,$RLX,$IX TC

I wanted to plot the Nas, BTK, SOX and DOT indexes on a one day only, intraday basis with % change, to see their relative strengths as the trading day progressed.

As opposed to the simple % change in a quote list, this would provide equity (and ETF) traders with a much better picture of sector strength.

If I overlayed those symbols in a chart, with your efs, do you think I could achieve this?

Thanks
shaeffer

[ACM]

shaeffer
In that case you may want to look at PerformanceComp.efs in this thread
Alex

[shaeffer]

Thanks Alex,

That's almost exactly what I wanted! I like it even better after dragging the % performance curves up into the main chart window.

I'll look at this closer, but hopefully there are no technical reasons I shouldn't be able to view 5 or 6 % Performance curves (asssuming I can make the correct changes to the efs)?

I've set my chart window to one day only, 9:30 - 4:00 EST, so I assume the start point will include any gaps (i.e. it won't start from the close of the day before)?

Thanks again
shaeffer

[eSignal_JasonK]

Hello shaeffer,

You could also apply the formula to a chart multiple times instead of trying to modify the code. Then just change the symbols used through Edit Studies. If you do modify the code, you'll be able to use up to 7 different symbols.

[shaeffer]

Hi Jason,

7 symbols would be plenty in one efs (or chart).

Using the efs multiple times is an interesting idea. But the main chart symbol would get recalculated each time - kind of a waste. Hopefully each efs would recognize the same '0' line if dragged into the main window?

In my reply to Alex, I commented that dragging the % change curves up into the chart together with the reference symbol gave an improved perspective, I'm now thinking that a non-study version of this efs (where all values are returned to the main chart window, with no real-price plot of the reference symbol) might also be useful.

Gotta think about this some more, but my gut feel is one efs with 7 symbols is the way to go. Thanks for the ideas.

Cheers
shaeffer

[shaeffer]

Hi Jason, Alex,

I got the 7 symbols into one efs, per the pic below.

The cursor window colors identify which curve is which sector, but I don't need the % value shown, just the sector name. Can the name only appear in the cursor window?
Or can I color each sector name in the EFS study title so I don't need the cursor window colors at all?

I know what sectors I want to see. Where can I input them directly to the efs? (so I don't need to re-input them via edit studies each time I tweek the efs)?

I tried to eliminate the $Comp actual-price curve by inserting 'setPriceStudy(true):' under premain(), but that didn't work. I guess the $Comp actual-price curve has to stay?

Thanks
shaeffer

[eSignal_JasonK]

Hello shaeffer,

The cursor window colors identify which curve is which sector, but I don't need the % value shown, just the sector name. Can the name only appear in the cursor window?
Or can I color each sector name in the EFS study title so I don't need the cursor window colors at all?

You won't be able to hide the % values in the cursor window or set individual colors for the names in the title. You could turn off the cursor label off all together and draw text labels on the chart for each sector name. Use drawTextRelative() with Text.RELATIVETOLEFT|Text.RELATIVETOBOTTOM flags.

I know what sectors I want to see. Where can I input them directly to the efs? (so I don't need to re-input them via edit studies each time I tweek the efs)?

Perform a series of null checks for the symbol input parameters and set them to your desired defaults if they are null. Add the follow just before the preMain() call inside main().

if (Symbol1 == null) Symbol1 = "$SOX";
if (Symbol2 == null) Symbol2 = "$BTK";
if (Symbol3 == null) Symbol3 = "$DOT";
if (Symbol4 == null) Symbol4 = "$GHA";
if (Symbol5 == null) Symbol5 = "$GSO";
if (Symbol6 == null) Symbol6 = "$RLX";
if (Symbol7 == null) Symbol7 = "$COMPQ";
preMain(); 

I tried to eliminate the $Comp actual-price curve by inserting 'setPriceStudy(true):' under premain(), but that didn't work. I guess the $Comp actual-price curve has to stay?

You can eliminate it. You'll notice at the top of main the variable, cSym. This is setting the first symbol in your array with the main chart symbol. You can remove the following two lines and the reference to cSym in preMain().

cSym = getSymbol();
vSymbols[0] = cSym; 

Then change any for loops that start with 1 to start with 0 instead.

[eSignal_JasonK]

shaeffer,

One more thing. If you remove the cSym stuff, you'll need to change the symbol input parameters to start with Symbol0 to Symbol6 so that they will work with the first for loop in main.

[shaeffer]

Hi Jason,

I tried to use the drawTextRelative command last night with no luck. Do you happen to know of an efs that uses that command so I can see how/where it fits in?

Thanks
shaeffer

[ACM]

shaeffer
Use the enclosed script as an example
For more information on the syntax of drawTextRelative click here
Alex

function preMain() {
    setPriceStudy(true);
    setStudyTitle("text");
    setCursorLabelName("N/A", 0);
}

function main() {
 
    drawTextRelative(25,0,"Sector1",Color.white,Color.blue,Text.RELATIVETOLEFT|Text.RELATIVETOBOTTOM|Text.BOLD,
                    "Arial",10,"Sector1");
    drawTextRelative(35,0,"Sector2",Color.white,Color.red,Text.RELATIVETOLEFT|Text.RELATIVETOBOTTOM|Text.BOLD,
                    "Arial",10,"Sector2");
    
    return;
} 

[shaeffer]

Hello,

I'm making progress on the 3 changes I'm trying to make.
-------------------------------------------
1. Adding text labels.

I input (some of) the lines you suggested Alex, and it works great. I guess I didn't need the premain commands 'cause I inserted them into an existing efs. I'm not sure what the main parameters were for, but it seems to work without them.

But for my own understanding, I was equating use of the "new function parameter" commands as the way to make variables appear in the Edit Studies window. Yet without any "new function paramenter" commands in this efs, variables still appear in the Edit Studies window. What command is causing this?
-------------------------------------------
2. Defining specific symbols

I inserted the commands you suggested before premain Jason, but am getting an error, and can't figure out why.

With the symbols defined, and not wanting cursor label names, can I remove the if, else statements in premain (and leave the setDefaultBarFgColor statements in premain with no conditions)?

Almost the same question... can I remove the vLoaded variable and lines 99-114?
---------------------------------------------
3. Removing the $Comp actual price curve

No action, I'm still deciding if I want to do that, as it can be useful, though I guess that affects changes to achieve 2. above

Thanks for your help
shaeffer

[ACM]

shaeffer
1. You only needed to copy the drawTextRelative() commands. The rest of the script was there so that you could run it as an efs.
Input parameters can be listed in Edit Studies even without the use of the Function Parameter class.
The sample efs enclosed below will list Length in Edit Studies
Alex

function preMain(){
    setStudyTitle("test");
}
function main(Length){
    if(Length==null)
        Length=10;
        
return;
} 

[shaeffer]

Y-axis scale updating

I've been using the attached % change EFS for a while now. I drag the EFS study up to overlay the Nasdaq price plot, and then view 1 minute, then 2, then 3... 5 minute charts as the day progresses, so I can see the entire day within the window.

When I change to a new time interval, I get good plots. But as time progresses, the updates don't plot correctly - the curves flatten. The vertical scaling doesn't adjust correctly. I have to re-enter the same time interval, or a new time, to get an accurate plot.

I've tried turning on/off the Scale Right and No Scale toggles in Edit Studies, with no luck. Is there any tweak can be done to this EFS so the vertical scaling updates correctly?

Thanks
shaeffer