<Online>
      <Host>localhost:8175</Host>
    </Online>

 odbedit -h A -e EXP

 odbedit -h localhost:8175 -e EXP

   ssh -L 21175:A:1175 B

   top

   ssh -L 21175:A:1175 B

   top

Dear Folks 

Complete newby on online mode - hence this easy question :

I have three machines, A, B, and C.

A is where a MIDAS EventBuilder is running 
B is a gateway machine 
C is my local machine on which I want to run ROME analyser (in online mode)

A is not accessible from C. B is accesible from both A and C - 

I want to utilize the fact that I have a gateway to run ROME analyser in online 
mode reading data from A via B -

If someone could explain how to do this in detail - but in simple terms - I'd be 
grateful 

Thank you !

Farrukh

I added a new parameter <EventStep> to configuration XML file.
The default is 1.
If you change it to, for example 2, every second events are analyzed.

For using it, you need to
- update ROME
- compile ROME
- re-build and make your project

Once you use an existing config XML file, a new parameter will be automatically added to it.

Ryu

> Dear Colleagues
> 
> I was wondering if there was an option to analyse only ever N events in ROME. If 
> this is doable via an xml switch I am guessing this would be the best and most 
> convenient solution.
> 
> Else any advice on how to do this in code would be great as well -
> 
> many thanks
> Farrukh

diff --git a/examples/histoGUI/histoGUI.xml b/examples/histoGUI/histoGUI.xml
index 3043dec..489052a 100644
--- a/examples/histoGUI/histoGUI.xml
+++ b/examples/histoGUI/histoGUI.xml
@@ -34,6 +34,7 @@
 				<GraphName>MyGraph</GraphName>
 				<GraphFolderName>mygraphs</GraphFolderName>
 				<GraphType>TGraph</GraphType>
+				<GraphArraySize>2</GraphArraySize>
 				<GraphXLabel>X</GraphXLabel>
 				<GraphYLabel>Y</GraphYLabel>
 				<GraphXmin>0</GraphXmin>
@@ -43,7 +44,9 @@
 				<Argus>
 					<Tab>
 						<TabName>GeneratedHisto</TabName>
+						<ObjectArrayIndex>0-1</ObjectArrayIndex>
 						<Index>4</Index>
+						<DrawSamePad>true</DrawSamePad>
 					</Tab>
 				</Argus>
 			</Graph>
diff --git a/examples/histoGUI/src/tasks/HGUITFillHisto.cpp b/examples/histoGUI/src/tasks/HGUITFillHisto.cpp
index 6ada840..c4dd95f 100644
--- a/examples/histoGUI/src/tasks/HGUITFillHisto.cpp
+++ b/examples/histoGUI/src/tasks/HGUITFillHisto.cpp
@@ -51,7 +51,10 @@ ClassImp(HGUITFillHisto)
 
 void HGUITFillHisto::Init()
 {
-   GetMyGraph()->SetMarkerStyle(31);
+   GetMyGraphAt(0)->SetMarkerStyle(31);
+   GetMyGraphAt(1)->SetMarkerStyle(31);
+   GetMyGraphAt(0)->SetMarkerColor(2);
+   GetMyGraphAt(1)->SetMarkerColor(4);
    GetMyGraphError()->SetMarkerStyle(8);
    GetMyGraphError()->SetMarkerColor(4);
 }
@@ -69,17 +72,23 @@ void HGUITFillHisto::Event()
    GetMyHistoAt(2)->SetLineColor(2);
    GetMyHistoAt(3)->SetLineColor(4);
    GetMyOtherHisto()->Fill(gRandom->Gaus(0,40));
-   GetMyGraph()->SetPoint(0,0,gRandom->Rndm());
-   GetMyGraph()->SetPoint(1,1,gRandom->Rndm());
-   GetMyGraph()->SetPoint(2,2,gRandom->Rndm());
-   GetMyGraph()->SetPoint(3,3,gRandom->Rndm());
-   GetMyGraph()->SetPoint(4,4,gRandom->Rndm());
+   GetMyGraphAt(0)->SetPoint(0,0,gRandom->Rndm());
+   GetMyGraphAt(0)->SetPoint(1,1,gRandom->Rndm());
+   GetMyGraphAt(0)->SetPoint(2,2,gRandom->Rndm());
+   GetMyGraphAt(0)->SetPoint(3,3,gRandom->Rndm());
+   GetMyGraphAt(0)->SetPoint(4,4,gRandom->Rndm());
+   GetMyGraphAt(1)->SetPoint(0,0,gRandom->Rndm());
+   GetMyGraphAt(1)->SetPoint(1,1,gRandom->Rndm());
+   GetMyGraphAt(1)->SetPoint(2,2,gRandom->Rndm());
+   GetMyGraphAt(1)->SetPoint(3,3,gRandom->Rndm());
+   GetMyGraphAt(1)->SetPoint(4,4,gRandom->Rndm());
    GetMyGraphError()->SetPoint(0,0,gRandom->Rndm());
    GetMyGraphError()->SetPoint(1,1,gRandom->Rndm());
    GetMyGraphError()->SetPoint(2,2,gRandom->Rndm());
    GetMyGraphError()->SetPoint(3,3,gRandom->Rndm());
    GetMyGraphError()->SetPoint(4,4,gRandom->Rndm());
-   ArgusHistoDisplay::SetLimits(GetMyGraph());
+   ArgusHistoDisplay::SetLimits(GetMyGraphAt(0));
+   ArgusHistoDisplay::SetLimits(GetMyGraphAt(1));
    ArgusHistoDisplay::SetLimits(GetMyGraphError());
 }
 

Dear Colleagues

I was wondering if there was an option to analyse only ever N events in ROME. If 
this is doable via an xml switch I am guessing this would be the best and most 
convenient solution.

Else any advice on how to do this in code would be great as well -

many thanks
Farrukh

I wanted to add two different TGraphs (Corresponding to two calorimeters) into
the same pad.
So in the xml file I did:
<Graph>
  <GraphName>MyGraph</GraphName>
  <GraphFolderName>mygraphs</GraphFolderName>
  <GraphType>TGraph</GraphType>
<GraphArraySize>2</GraphArraySize>
  <GraphXLabel>Event no.</GraphXLabel>
  <GraphYLabel>Island no.</GraphYLabel>
  <GraphXmin>0</GraphXmin>
  <GraphXmax>10000</GraphXmax>
  <GraphYmin>0</GraphYmin>
  <GraphYmax>100000</GraphYmax>
 <Argus>
<Tab>
      <TabName>SummaryFCBank</TabName>
    <ObjectArrayIndex>0-1</ObjectArrayIndex>
      <Index>1</Index>
 <DrawSamePad>true</DrawSamePad>
    </Tab>
  </Argus>
</Graph>


And in src/tasks:
in the HGUITFillHisto.cpp code I did:
 for(int icalo=1; icalo<3; icalo++)   [For each calorimeter there is one bank, and one n_islands value from that
bank per event.]                        
    {
GetMyGraphAt(icalo-1)->SetPoint(gAnalyzer->GetCurrentEventNumber(),gAnalyzer->GetCurrentEventNumber(),n_islands);

 GetMyGraphAt(0)->SetMarkerColor(2); 

 GetMyGraphAt(1)->SetMarkerColor(3);

 ArgusHistoDisplay::SetLimits(GetMyGraphAt(icalo-1));

}

But then I get an empty pad in the tab. 
It works when I create the TGraph for only one calorimeter, using GetMyGraph().

Any help would be much appreciated.

Thanks!
Sudeshna

Dear Joe

There is a working example for the online access to midas.

Please see,
https://bitbucket.org/muegamma/rome3/wiki/Midas
The example is $ROMESYS/examples/midas.
There is a README file in the directory.
The example works with an example experiment in MIDAS package so you can try.
If you look at ADC2 tab, the histograms should be updated when DAQ is running.

The "Trigger" events are polled in the MIDAS frontend, and "Scaler" data are taken periodically.
So I guess the "Scaler" corresponds to your INPT and "Trigger" corresponds to your other event types.

You may compare the examples and your analyzer/frontend for finding the cause of your problem.

Ryu

> Hello all,
> 
> I'm having an issue with getting rome to run in online mode in some cases only.
>  That is, when I run the analyzer that accesses the INPT bank (standard for PSI
> slow control buses) the online mode works just fine.  But when I access other
> banks, when I run in online mode only blank canvases are updated and no data
> appears.
> 
> I can run all of these analyzers in offline mode and they all work as expected
> so this eliminates many common user bugs.  Any ideas how I might debug further?
>  I also tried printing the data in the various tasks and indeed in online mode
> no data is being accessed.
> 
> Thanks,
> Joe

Yes, it can be done easily by nesting the tab definition in your definition XML file.
An example is $ROMESYS/examples/argus/tabs

Ryu

> Hi Everyone,
> 
> Is there any way I can put different tabs under a single click-able menu in ROME?
> Suppose I have tabs A, B, C, D. Each one of these tabs contains histograms. Can
> I now, put A, B, C, D under another click-able menu called "calorimeters" ?
> 
> So that when I click on "calorimeters", I will see A, B, C, D. And then when I
> click on A/B/C/D I will see the histograms.
> 
> Can that be done?
> Is there any example available?
> 
> Thanks for any help!
> Sudeshna

Hi Everyone,

Is there any way I can put different tabs under a single click-able menu in ROME?
Suppose I have tabs A, B, C, D. Each one of these tabs contains histograms. Can
I now, put A, B, C, D under another click-able menu called "calorimeters" ?

So that when I click on "calorimeters", I will see A, B, C, D. And then when I
click on A/B/C/D I will see the histograms.

Can that be done?
Is there any example available?

Thanks for any help!
Sudeshna

Hello all,

I'm having an issue with getting rome to run in online mode in some cases only.
 That is, when I run the analyzer that accesses the INPT bank (standard for PSI
slow control buses) the online mode works just fine.  But when I access other
banks, when I run in online mode only blank canvases are updated and no data
appears.

I can run all of these analyzers in offline mode and they all work as expected
so this eliminates many common user bugs.  Any ideas how I might debug further?
 I also tried printing the data in the various tasks and indeed in online mode
no data is being accessed.

Thanks,
Joe

Dear Sudeshna

Unfortunately, with the current ROME, it is not possible to insert own code when you use <Argus> blocks for 
which the source code is supposed to be generated automatically (and not editable).

If you want to do more than the automatically generated code, you can use the normal type tabs although you 
need to program it by yourself (as you program tasks).

An example is $ROMESYS/examples/midas.
In midas.xml, you can find <Tabs> section where several normal tabs are defined.
Corresponding source files will be generated in src/tabs when you run romebuilder after modifying the 
definition 
XML.

As for source files of tasks, you can edit the source files of tabs as you want.
ROMEbuilder will not overwrite the files.
You can draw any ROOT GUI objects in the tabs including text.

You can get the pointer of histograms associated to a task.
For example, in the midas example, src/tabs/MIDTADCTab.cpp, a pointer of a histogram 'ADC' of 
'FillHistogram' 
task is obtained by
  gAnalyzer->GetFillHistogramTask()->GetADCAt(i)

Please let me know if you have any problems to write code for your tabs.

Best regards,

Ryu



> Hi,
> 
> I am defining a histogram in the xml file like this:
> 
> <Histogram>
>   <HistName>h2_dt_tcpgotheader</HistName>
>   <HistFolderName>BC</HistFolderName>
>   <HistType>TH2D</HistType>
> <HistXLabel>time(us)</HistXLabel>
>   <HistYLabel>Entries</HistYLabel>
>   <HistXNbins>300000</HistXNbins>
>   <HistXmin>-20000</HistXmin>
>   <HistXmax>100000</HistXmax>
>   <HistYNbins>10</HistYNbins>
>   <HistYmin>0.0</HistYmin>
>   <HistYmax>10</HistYmax>-->
>   <Argus>
>     <Tab>
>       <TabName>SummaryBCBank</TabName>
>       <Index>0</Index>
>     </Tab>
>   </Argus>
> <Histogram>
>   <HistName>h2_dt_tcpgotheader</HistName>
>   <HistFolderName>BC</HistFolderName>
>   <HistType>TH2D</HistType>
> <HistXLabel>time(us)</HistXLabel>
>   <HistYLabel>Entries</HistYLabel>
>   <HistXNbins>300000</HistXNbins>
>   <HistXmin>-20000</HistXmin>
>   <HistXmax>100000</HistXmax>
>   <HistYNbins>10</HistYNbins>
>   <HistYmin>0.0</HistYmin>
>   <HistYmax>10</HistYmax>-->
>   <Argus>
>     <Tab>
>       <TabName>SummaryBCBank</TabName>
>       <Index>0</Index>
>     </Tab>
>   </Argus>
> </Histogram>
> 
> Now I want to add few texts and arrows on the same pad where the histogram is
> being written.
> 
> I want to add this piece of code:
> 
>   TLatex title;
>   title.SetTextFont(12);
>   title.SetTextSize(0.03);
>   title.SetNDC();
> 
> 
>       title.SetTextColor(2);
>       title.DrawLatex(0.01,0.32,"tcp header #rightarrow");
>       title.SetTextColor(3);
>       title.DrawLatex(0.01,0.4,"tcp data  #rightarrow");
>       title.SetTextColor(4);
>       title.DrawLatex(0.01,0.48,"copy to GPU #rightarrow");
>       title.SetTextColor(5);
>       title.DrawLatex(0.01,0.56,"GPU processing #rightarrow");
>       title.SetTextColor(6);
>       title.DrawLatex(0.01,0.64,"MFE start #rightarrow");
>       title.SetTextColor(7);
>       title.DrawLatex(0.01,0.72,"MFE stop #rightarrow");
> 
> The problem is that if I add this piece of code in the src/tasks, where I fill
> in the histogram, then the problem is that this histogram replaces whatever is
> on the last tab on the canvas.
> 
> As I recall that I am not supposed to add extra tabbing codes in the src codes
> when I am using the <Argus> block for tabbing.
> 
> So where can I add these texts while still using <Argus> block for tabbing?
> 
> Any help might be very much appreciated.

Hi,

I am defining a histogram in the xml file like this:

<Histogram>
  <HistName>h2_dt_tcpgotheader</HistName>
  <HistFolderName>BC</HistFolderName>
  <HistType>TH2D</HistType>
<HistXLabel>time(us)</HistXLabel>
  <HistYLabel>Entries</HistYLabel>
  <HistXNbins>300000</HistXNbins>
  <HistXmin>-20000</HistXmin>
  <HistXmax>100000</HistXmax>
  <HistYNbins>10</HistYNbins>
  <HistYmin>0.0</HistYmin>
  <HistYmax>10</HistYmax>-->
  <Argus>
    <Tab>
      <TabName>SummaryBCBank</TabName>
      <Index>0</Index>
    </Tab>
  </Argus>
<Histogram>
  <HistName>h2_dt_tcpgotheader</HistName>
  <HistFolderName>BC</HistFolderName>
  <HistType>TH2D</HistType>
<HistXLabel>time(us)</HistXLabel>
  <HistYLabel>Entries</HistYLabel>
  <HistXNbins>300000</HistXNbins>
  <HistXmin>-20000</HistXmin>
  <HistXmax>100000</HistXmax>
  <HistYNbins>10</HistYNbins>
  <HistYmin>0.0</HistYmin>
  <HistYmax>10</HistYmax>-->
  <Argus>
    <Tab>
      <TabName>SummaryBCBank</TabName>
      <Index>0</Index>
    </Tab>
  </Argus>
</Histogram>

Now I want to add few texts and arrows on the same pad where the histogram is
being written.

I want to add this piece of code:

  TLatex title;
  title.SetTextFont(12);
  title.SetTextSize(0.03);
  title.SetNDC();


      title.SetTextColor(2);
      title.DrawLatex(0.01,0.32,"tcp header #rightarrow");
      title.SetTextColor(3);
      title.DrawLatex(0.01,0.4,"tcp data  #rightarrow");
      title.SetTextColor(4);
      title.DrawLatex(0.01,0.48,"copy to GPU #rightarrow");
      title.SetTextColor(5);
      title.DrawLatex(0.01,0.56,"GPU processing #rightarrow");
      title.SetTextColor(6);
      title.DrawLatex(0.01,0.64,"MFE start #rightarrow");
      title.SetTextColor(7);
      title.DrawLatex(0.01,0.72,"MFE stop #rightarrow");

The problem is that if I add this piece of code in the src/tasks, where I fill
in the histogram, then the problem is that this histogram replaces whatever is
on the last tab on the canvas.

As I recall that I am not supposed to add extra tabbing codes in the src codes
when I am using the <Argus> block for tabbing.

So where can I add these texts while still using <Argus> block for tabbing?

Any help might be very much appreciated.

Dear Sudeshna

Yes, you can write,

There is an example project for showing the access to databases.
$ROMESYS/examples/dbexample/

For writing, an example is
$ROMESYS/examples/dbexample/src/tasks/RDBTWriteFolders.cpp

If you prefer to use normal SQL queries rather than using the ROME DB path. An example is,
$ROMESYS/examples/dbexample/src/tasks/RDBTMakeQuery.cpp
By using SQL query, you can do anything about DB.

More information is in wiki,
https://bitbucket.org/muegamma/rome3/wiki/Database

Best regards,

Ryu

> I need some suggestions on how to write some data to a mySQL database via ROME.
> 
> I am calculating a quantity CTag and making a TGraph of CTag/event in ROME. Now
> if I want to write it to a mySQL what shall I do?
> 
> From the manual I found that we can read from a database DAQ (SQL) system. That
> it reads the main input data from a database. And I looked into the example 
> under'rome/examples/stepbystepdbdaq'. 
> 
> But is there any way I can write the calculated CTags and Event Numbers to a SQL
> database?
> 
> Thanks for any suggestion!

I need some suggestions on how to write some data to a mySQL database via ROME.

I am calculating a quantity CTag and making a TGraph of CTag/event in ROME. Now
if I want to write it to a mySQL what shall I do?

From the manual I found that we can read from a database DAQ (SQL) system. That
it reads the main input data from a database. And I looked into the example 
under'rome/examples/stepbystepdbdaq'. 

But is there any way I can write the calculated CTags and Event Numbers to a SQL
database?

Thanks for any suggestion!

Hello,

First of all, the histograms are supposed to be drawn by the automatically generated code.

You don't need (and should not) draw them from a task.
If you do so, the histograms are drawn on the active pad (gPad) which is, in your case, the last pad on a tab.


I added a new feature to ROME development branch.
For using the feature, you can try
 cd $ROMESYS
 git checkout develop
 git pull
 make
 cd your_project
 make build
 make

As you can see in the updated examples/histoGUI/histoGUI.xml, a new option <DrawSamePad>true</DrawSamePad> is 
available.
When it is true, the array of histograms are drawn on the same pad.

If you have any problems, please let me know.

Best regards,

Ryu


> I need some suggestions regarding drawing multiple histograms on the same pad in
> ROME.
> Here is what I have been doing.  I am making a summary histogram online dispaly
> with ARGUS. The displays is gonna show multiple different types of histograms. 
> 
> So I made a module with four different types of histograms all on the same canvas,
> so that I can look at them in real time in an online run.
> 
> Now in one of the histograms, I am looping over multiple banks, so in one of the
> pads, I want to see two different lines of different colors (to indicate two
> different histograms of the same type from two banks). 
> So I used histoGUI.xml (from examples/histoGUI) and used this way of histogram
> and tab declarations:
>   <Tasks>
>                 <Task>
>                         <TaskName>FillHisto</TaskName>
>         <Histogram>
>                                 <HistName>h1_Esum</HistName>
> 
> 
>                                 <HistArraySize>2</HistArraySize>
>                                 <HistFolderName>myhistos</HistFolderName>
>                                 <HistType>TH1F</HistType>
> 
>                                 <HistXLabel>ESum</HistXLabel>
>                                 <HistYLabel>Entries</HistYLabel>
>                                 <HistXNbins>300</HistXNbins>
>                                 <HistXmin>0</HistXmin>
>                                 <HistXmax>3.1</HistXmax>
> </Histogram>               
> 
> 
> 
> 
> <Histogram>
>                                 <HistName>h1_amplitude</HistName>
>                                 <HistFolderName>myotherhistos</HistFolderName>
>                                  <HistArraySize>108</HistArraySize>
> 
> 
>                                 <HistType>TH1F</HistType>
>                                 <HistXLabel>Amplitude</HistXLabel>
>                                 <HistYLabel>Entries</HistYLabel>
>                                 <HistXNbins>4096</HistXNbins>
>                                 <HistXmin>-0.5</HistXmin>
>                                 <HistXmax>4095.5</HistXmax>
>                                 <Argus>
>                                         <Tab>
>                                                 <TabName>GeneratedHisto</TabName>
>                                               
> <ObjectArrayIndex>0</ObjectArrayIndex>
> 
>                                                 <Index>1</Index>
>                                         </Tab>
>                                 </Argus>
>                         </Histogram>
> 
> etc. and two other histograms have been defined in the same way.
> 
> And then in the src/task: HGUITFillHisto.cpp
> I added this: (to draw two histograms on the same pad)
> 
>           if(icalo==1)
>             {
>           Geth1_EsumAt(0)->Fill(0.00009118*sum);
> 
>           Geth1_EsumAt(0)->SetLineColor(3);
> 
>              }
> 
>           Geth1_EsumAt(0)->Draw();
> 
>           if(icalo==2)
>             {
>           Geth1_EsumAt(1)->Fill(0.00009118*sum);
> 
>             }
> 
>           Geth1_EsumAt(1)->Draw("same");
> 
> And attached is the screen shot from ARGUS.
> 
> Now the problem is: when I add the Draw() and Draw("same") codes in the src/task
> code, it always creates two copies of the same pad. The 0th pad and the very last
> pad. So what ever is on the last pad in the attachment is being replaced by the
> same copy of the 0th pad. I kept chaning the Index number in histoGUI.xml, but what
> ever I do, if I try to draw two histograms on the same pad and add those codes in
> the srdc/task .cpp file, it always creates two copies.
> 
> I don't know where to look at to fix the problem.
> 
> Is there any other way I can add multiple histograms on a pad, while keeping the
> other pads on the canvas intact?
> 
> Any help on this issue will be much appreciated.

I need some suggestions regarding drawing multiple histograms on the same pad in
ROME.
Here is what I have been doing.  I am making a summary histogram online dispaly
with ARGUS. The displays is gonna show multiple different types of histograms. 

So I made a module with four different types of histograms all on the same canvas,
so that I can look at them in real time in an online run.

Now in one of the histograms, I am looping over multiple banks, so in one of the
pads, I want to see two different lines of different colors (to indicate two
different histograms of the same type from two banks). 
So I used histoGUI.xml (from examples/histoGUI) and used this way of histogram
and tab declarations:
  <Tasks>
                <Task>
                        <TaskName>FillHisto</TaskName>
        <Histogram>
                                <HistName>h1_Esum</HistName>


                                <HistArraySize>2</HistArraySize>
                                <HistFolderName>myhistos</HistFolderName>
                                <HistType>TH1F</HistType>

                                <HistXLabel>ESum</HistXLabel>
                                <HistYLabel>Entries</HistYLabel>
                                <HistXNbins>300</HistXNbins>
                                <HistXmin>0</HistXmin>
                                <HistXmax>3.1</HistXmax>
</Histogram>               




<Histogram>
                                <HistName>h1_amplitude</HistName>
                                <HistFolderName>myotherhistos</HistFolderName>
                                 <HistArraySize>108</HistArraySize>


                                <HistType>TH1F</HistType>
                                <HistXLabel>Amplitude</HistXLabel>
                                <HistYLabel>Entries</HistYLabel>
                                <HistXNbins>4096</HistXNbins>
                                <HistXmin>-0.5</HistXmin>
                                <HistXmax>4095.5</HistXmax>
                                <Argus>
                                        <Tab>
                                                <TabName>GeneratedHisto</TabName>
                                              
<ObjectArrayIndex>0</ObjectArrayIndex>

                                                <Index>1</Index>
                                        </Tab>
                                </Argus>
                        </Histogram>

etc. and two other histograms have been defined in the same way.

And then in the src/task: HGUITFillHisto.cpp
I added this: (to draw two histograms on the same pad)

          if(icalo==1)
            {
          Geth1_EsumAt(0)->Fill(0.00009118*sum);

          Geth1_EsumAt(0)->SetLineColor(3);

             }

          Geth1_EsumAt(0)->Draw();

          if(icalo==2)
            {
          Geth1_EsumAt(1)->Fill(0.00009118*sum);

            }

          Geth1_EsumAt(1)->Draw("same");

And attached is the screen shot from ARGUS.

Now the problem is: when I add the Draw() and Draw("same") codes in the src/task
code, it always creates two copies of the same pad. The 0th pad and the very last
pad. So what ever is on the last pad in the attachment is being replaced by the
same copy of the 0th pad. I kept chaning the Index number in histoGUI.xml, but what
ever I do, if I try to draw two histograms on the same pad and add those codes in
the srdc/task .cpp file, it always creates two copies.

I don't know where to look at to fix the problem.

Is there any other way I can add multiple histograms on a pad, while keeping the
other pads on the canvas intact?

Any help on this issue will be much appreciated.