Re: Drawing histograms from a root file with directories

Hi,

You can use:

canvas->Print( TString::Format("%s.png",profilehisto->GetName()), "png");

Cheers,
Philippe.

On 5/2/10 9:51 AM, Suvayu Ali wrote:
> 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>
>>>
>>>
>>
>
>
Received on Sun May 02 2010 - 17:00:11 CEST