Re: Drawing histograms from a root file with directories

Hi Axel,

On Sunday 02 May 2010 05:10 AM, Axel Naumann wrote:
> Hi Suvayu,
>
> I believe you are checking whether TKey derives from TProfile - and you
> find that it doesn't :-) What you might try instead is
>

That was extremely silly of me. :-p

> TClass* objClass = TClass::GetClass(key->GetClassName());
> if (objClass&& objClass->InheritsFrom(TProfile::Class())) {...}
>
> Same for the TDirectory check, of course. Passing a TClass* (from
> TProfile::Class()) to InheritsFrom() is a lot faster than the string
> version, by the way.
>

Works like a charm! And thanks for the speed tip. :)

One last question. while printing the canvas, I take the file name from the name of the histogram like this,

canvas->Print( profilehisto->GetName(), "png");

Is it possible to include the png extension in the filename somehow?

Thanks a lot again. :)

> Cheers, Axel.
>
> On 2010-05-02 02:43, Suvayu Ali wrote:
>> Hi ROOT users,
>>
>> I am not very well versed with ROOT and I am stuck with something very
>> basic. I have a root file with lots of directories with lots of
>> histograms. I want to plot all the TProfiles with their name starting
>> with a certain string in my own style and then save these plots in a png
>> file.
>>
>> To achieve this I wrote the attached script. To navigate within the root
>> file I took hints from $ROOTSYS/tutorials/io/readCode.C.
>>
>> But I still can't seem to recurse through the directories and find my
>> histograms. I had to replace the "key->IsFolder()" check with
>> "key->InheritsFrom("TDirectory")" as my file contains a TTree with
>> metadata in each folder, and the script tries to recurse into it.
>>
>> Where am I going wrong?
>>
>> Thanks for any help.
>>
>>
>> [1]<http://hep.phys.sfu.ca/~suvayu/mergedMonitor_collision_7TeV_153565_v3b.root>
>>
>

-- 
Suvayu

Open source is the future. It sets us free.