getValue bug?

[futurenets]

something wierd happening here in the UK 8am ...

function main() {

    if (!bInitialized) {
        var nLength = 10;
        var sSI = getSymbol() + ",60";
        var aClose = getValue("close", 0, -nLength, sSI);
        var len = 0; //aClose.length();
        debugPrintln(len);
        bInitialized = true;
    }

    return null;
}

nLength = 0
len = 0
works ok

[futurenets]

but

nLength = 10;
len = aClose.length();

produces no debug output

[futurenets]

and

nLength = 300;
len = 0;

produces no debug output (but this sometimes resolves itself later in the day)

[futurenets]

problems below exist on ES #F

but e.g. $VIX is ok

[ACM]

Paul
FWIW both examples posted by you seem to be working at my end as you can see in the enclosed animations
Alex

Originally posted by futurenets
but

nLength = 10;
len = aClose.length();

produces no debug output

Originally posted by futurenets
and

nLength = 300;
len = 0;

produces no debug output (but this sometimes resolves itself later in the day)

Originally posted by futurenets
problems below exist on ES #F

but e.g. $VIX is ok

[futurenets]

ok Alexis but this is like trying to hit a moving target!

last week a colleage in the US couldn't get it to work and neither could I.

Just tried it now (as you have done) and it works.

However just tried this ..

function main() {

    if (!bInitialized) {
        var nLength = 300;
        var sSI = getSymbol() + ",60";
        //var aClose = getValue("close", 0, -nLength, sSI);
        var aClose = getValue("close", -nLength, nLength, sSI);
        var len = 0; //aClose.length();
        debugPrintln(len);
        bInitialized = true;
    }

	return null;
}

and it doesn't work i.e. no debug output is produced.

this is out of my control, any chance you could get to the bottom of this.

if we assume there isn't a problem, it will just reoccur.

[futurenets]

also

var len = aClose.length();

produces no debug output.

[waynecd]

Hi,

I don't know if this is of any use but changing the minus sign for the -nLength- variable in the "getValue(..." statement produces output on an "ES #F" daily chart that loads 300 bars. Both of the next statements output the zero:

var aClose = getValue("close", nLength, -nLength, sSI);
var aClose = getValue("close", nLength, nLength, sSI); 

Yet the statement in your example doesn't output at all:

var aClose = getValue("close", -nLength, nLength, sSI); 

nor does "var aClose = getValue("close", -nLength, -nLength, sSI);" which I tested just to see what happened.

The [, nOffset] is the bar index so I believe it should be a negative number and the [, nNumBars] is the # of bars to return so it should be a positive number. Yet it seems to work opposite to the above.

I used this test code:

var bInitialized = false;
function main() {
    if (!bInitialized) {
        var nLength = 300;
        var sSI = getSymbol() + ",60";
        //var aClose = getValue("close",- nLength, nLength, sSI);
        //var aClose = getValue("close", nLength, nLength, sSI);
        var aClose = getValue("close", nLength, -nLength, sSI);
        var len = 0; //aClose.length();
        debugPrintln(len);
        bInitialized = true;
    }
    return null;
} 

Of course "var Len" is not a condition or result of any code above it so it should output regardless unless the "var aClose" condition is somehow stopping the execution of the code.

Wayne

[futurenets]

ok thanks.

just tried it this morning and ...

var aClose = getValue("close", 0, -nLength, sSI);
produced debug output

var aClose = getValue("close", -nLength, nLength, sSI);
produces debug output

var len = aClose.length();
does not produce debug output

[waynecd]

Hi,

Using the test code below on a 60 min ES #F chart, “aClose” cycles as many times as there are loaded bars and outputs line 14 (debugPrintln(“14…” each time fully populated with all the close prices yet once it gets to the current bar (bar 0 or Cntr = 598) it returns null. That is why “aClose.length” returns null at the end. I have no clue if that is how it should behave.

I have no answers just the behavior I found so hopefully someone who knows what is going on can add an explanation.

 debugClear();
var Cntr = 0;
var Cntr1 = 0;
var bInitialized = false;
var aClose = null;

function main() {

    if (bInitialized == false) {
        Cntr++
        var nLength = 300;
        var sSI = getSymbol() + ",60";
        aClose = getValue("Close", nLength, -nLength, sSI);
        debugPrintln("14: aClose = "+aClose+"\n");
        if(aClose != null) debugPrintln("aClose.length(); = "+aClose.length()+"\n");//output is that aclose has no Properties
        var len = 0; //aClose.length();
        debugPrintln("len = "+len+"\n");
        Cntr1++
        debugPrintln("19: !!!!!!!!!!!!!!!!!!"+Cntr+", "+Cntr1);
        bInitialized = true;
    }
    return null;
} 

Below, line 14 shows the counter (I omitted all output prior to bar 595 to save space since it just repeats the same data except for the “Cntr” value which is the bar it is processing. The last bar loaded on the chart is bar # 598. Note that when it reaches it “aClose” reverts to null.

19: !!!!!!!!!!!!!!!!!!598, 1
len = 0

14: Cntr = 598, aClose = null

14: Cntr = 597, aClose = 1065.75,1066.25,1066.25,1068.25,1072,1080.5,1083,1 087.5,1085.5,1083.75,
1078.5,1079.75,1074.5,1072.5,1076.25,1078.5,1082,1 083.75,1080,1080.5,
1079.25,1083.5,1079.25,1077,1081.75,1082,1084.5,10 84.5,1085.75,1075.25,
1082.25,1080.5,1085.25,1072.25,1072.25,1062.25,106 3.5,1066.25,1072.75,
1074,1074.25,1077.5,1077,1074.75,1074.5,1072.5,107 0.75,1067.25,1067,1064,
1065,1065.25,1070.25,1086,1082,1072,1083.25,1082.7 5,1090.5,1088.5,1093.5,
1103.5,1107.5,1111.5,1112.75,1109.5,1107.5,1110.25 ,1110.75,1112.75,1112.25,
1113,1115.25,1113.5,1114.5,1115,1113,1112.75,1114. 25,1113.25,1104.25,1111,
1118.5,1116.25,1111.25,1108.5,1105.75,1108.5,1114. 25,1116.5,1114.75,1112,
1112.5,1111.25,1110.25,1107.5,1108.25,1112,1111.75 ,1115.5,1119.25,1118.5,
1123.25,1132,1132,1136.25,1143.25,1143.5,1142,1140 .5,1138,1137,1139,1139.25,
1134,1132.5,1133.25,1130.75,1132.75,1132.5,1136.5, 1137,1136.25,1136.75,
1134.5,1129.25,1122.5,1117.5,1121.5,1130.5,1132,11 34,1138,1136.25,1134.75,
1132.5,1128.5,1127.75,1123,1124,1121,1122.25,1128. 25,1_´÷O
14: Cntr = 596, aClose = 1066.25,1066.25,1068.25,1072,1080.5,1083,1087.5,10 85.5,1083.75,1078.5,1079.75
,1074.5,1072.5,1076.25,1078.5,1082,1083.75,1080,10 80.5,1079.25,1083.5,1079.25
,1077,1081.75,1082,1084.5,1084.5,1085.75,1075.25,1 082.25,1080.5,1085.25,
1072.25,1072.25,1062.25,1063.5,1066.25,1072.75,107 4,1074.25,1077.5,1077,
1074.75,1074.5,1072.5,1070.75,1067.25,1067,1064,10 65,1065.25,1070.25,1086,
1082,1072,1083.25,1082.75,1090.5,1088.5,1093.5,110 3.5,1107.5,1111.5,1112.75,
1109.5,1107.5,1110.25,1110.75,1112.75,1112.25,1113 ,1115.25,1113.5,1114.5,
1115,1113,1112.75,1114.25,1113.25,1104.25,1111,111 8.5,1116.25,1111.25,1108.5,
1105.75,1108.5,1114.25,1116.5,1114.75,1112,1112.5, 1111.25,1110.25,1107.5,
1108.25,1112,1111.75,1115.5,1119.25,1118.5,1123.25 ,1132,1132,1136.25,1143.25,
1143.5,1142,1140.5,1138,1137,1139,1139.25,1134,113 2.5,1133.25,1130.75,
1132.75,1132.5,1136.5,1137,1136.25,1136.75,1134.5, 1129.25,1122.5,1117.5,
1121.5,1130.5,1132,1134,1138,1136.25,1134.75,1132. 5,1128.5,1127.75,1123,
1124,1121,1122.25,1128.25,1133,1133_´÷O
14: Cntr = 595, aClose = 1066.25,1068.25,1072,1080.5,1083,1087.5,1085.5,108 3.75,1078.5,1079.75,1074.5,
1072.5,1076.25,1078.5,1082,1083.75,1080,1080.5,107 9.25,1083.5,1079.25,1077,
1081.75,1082,1084.5,1084.5,1085.75,1075.25,1082.25 ,1080.5,1085.25,1072.25,
1072.25,1062.25,1063.5,1066.25,1072.75,1074,1074.2 5,1077.5,1077,1074.75,
1074.5,1072.5,1070.75,1067.25,1067,1064,1065,1065. 25,1070.25,1086,1082,1072,
1083.25,1082.75,1090.5,1088.5,1093.5,1103.5,1107.5 ,1111.5,1112.75,1109.5,
1107.5,1110.25,1110.75,1112.75,1112.25,1113,1115.2 5,1113.5,1114.5,1115,1113,
1112.75,1114.25,1113.25,1104.25,1111,1118.5,1116.2 5,1111.25,1108.5,1105.75,
1108.5,1114.25,1116.5,1114.75,1112,1112.5,1111.25, 1110.25,1107.5,1108.25,
1112,1111.75,1115.5,1119.25,1118.5,1123.25,1132,11 32,1136.25,1143.25,1143.5,
1142,1140.5,1138,1137,1139,1139.25,1134,1132.5,113 3.25,1130.75,1132.75,
1132.5,1136.5,1137,1136.25,1136.75,1134.5,1129.25, 1122.5,1117.5,1121.5,
1130.5,1132,1134,1138,1136.25,1134.75,1132.5,1128. 5,1127.75,1123,1124,1121,
1122.25,1128.25,1133,1133.5,1132._´÷O

Wayne

[futurenets]

thanks Wayne, very much appreciated. will eSignal take a look at this?

[waynecd]

All you can do is ask.

On first load, on a daily chart (ES #F loads 301 bars) it outputs "aClose" only once.

19: !!!!!!!!!!!!!!!!!!2, 1
len = 0

14: Cntr = 2, aClose = null

14: Cntr = 1, aClose = 1049.5,1052.25,1053.25,1053,1057.25,1058.5,1059.25 ,
1064.75,1066.25,1066.25,1068.25,1072,1080.5,1083,
1087.5,1085.5,1083.75,1078.5,1079.75,1074.5,1072.5 ,
1076.25,1078.5,1082,1083.75,1080,1080.5,1079.25,
1083.5,1079.25,1077,1081.75,1084,1084.5,1084.5,
1085.75,1075.25,1082.25,1080.5,1085.25,1072.25,
1072.25,1062.25,1063.5,1066.25,1072.75,1074,
1074.25,1077.5,1077,1074.75,1074.5,1072.5,
1070.75,1067.25,1067,1064,1065,1065.25,1070,
1086,1082,1072,1083.25,1082.75,1090.5,1088.5,
1093.5,1103.5,1107.5,1111.5,1112.75,1109.5,
1107.5,1110.25,1110.75,1112.75,1112.25,1113,
1115.25,1113.5,1114.5,1115,1113,1112.75,
1114.25,1113.25,1104.25,1111,1118.5,1116.25,
1111.25,1108.5,1105.75,1108.5,1114.25,1116.5,
1114.75,1112,1112.5,1111.25,1110.25,1107.5,
1108.25,1112,1111.75,1115.5,1119.25,1118.5,
1123.25,1132,1132,1136.25,1143.25,1143.5,1142,
1140.5,1138,1137,1139,1139.25,1134,1132.5,
1133.25,1130.75,1132.75,1132.5,1136.5,1137,
1136.25,1136.75,1134.5,1129.25,1122.5,1117.5,
1121.5,1130.5,1132,1134,1138,1136.25,1134.75,
1132.5,1´÷O

On first load (ES #F 60 min chart with 300 bars loaded) it only outputs:

19: !!!!!!!!!!!!!!!!!!1, 1
len = 0

14: Cntr = 1, aClose = null

But once I move the 60 min chart backwards (it then loads 599 bars) and reload the study, I then get the repetition I posted below of "aClose" up to bar count 299 with "aClose = null" at bar count 300 (odd since it now has 599 bars loaded).

When I continue to move backwards on the chart so it loads more bars, 898 bars now) it now repeats "aClose" data to bar 598 with bar 599 = null.

Wayne

[waynecd]

Going back to the basics, a code example at: http://kb.esignalcentral.com/display...27705001831055 states:

//retrieve?the?most?recent?20?high?values?into?an?ar ray
//where the [0] element of myArray contains the high at bar -19.
var myArray?=?getValue(?"high",?-19,?20?); // less common method

So the test code I used should retrieve the most recent 300 closes starting with index bar -300. But it loads 300 bars less than the total bars loaded whether "aClose" is set as a global variable or a local one. So upon moving back to load 899 bars it outputs "aClose" 598 times not 300 times. And still the last output of "aClose" is null.

Thanks

Wayne

Note: the question marks are as they are displayed in the web page. They are not my typos.

[futurenets]

ok thanks Wayne.

I wanted to find out why the script ended prematurely when I try and find the length of the array ...

var len = aClose.length();

[waynecd]

I wasn't much help to either of us on this one.

I don't know. But I would really like to.

Wayne