Re: MyHist_2D ->Draw() :: Intersting

From: Marc Escalier <escalier_at_lal.in2p3.fr>
Date: Mon, 9 Aug 2010 20:37:32 +0200

Hi,

the behaviour that you observe is strange.

==> Maybe you should put some
printing in your code to see what dt and fabs(dx) are.

maybe that fabs(dx) give you back a strange stuff : so printing it could help for the investigation

i assume that dt and dx
are not pointers and not vectors.

and maybe provide a minimal code to check (if feasible)

and provide some copy/paste of the line that define : myhist_2D
myhist_2D_abs
dt
dx

(or also, put your code in a public directory of lxplus (i don't find it in ~asaddiqu at lxplus)

regards

---

On Mon, 9 Aug 2010, asaddiqu_at_ualberta.ca wrote:

> Thank you Stephan & Marc for your reply.
>
> I am pretty sure that there is no sub directory problem. I just found an
> interesting thing which might explain my problem.
> Let say i have two parameters time "dt"(which is always positive) & distance
> from either side of a vertex"dx"(could be positive or negative)to fill a 2D
> histogram. In first case i take absolute value of "dx" and in second case i
> don't,
>
> Case1:
> myhist_2D_abs->Fill(dt,fabs(dx));
>
> Case2 :
> myhist_2D->Fill(dt,dx);
>
> So, "Draw()" command works for second case but does not work for first
> case(for absolute value) and gives an error message that i already mentioned.
>
>
> Cheers, Asif
>
>
>
>
>
>
>
>
>
>
>
>
> Quoting asaddiqu_at_ualberta.ca:
>
>>
>> Hi,
>>
>> I can view my 2D histogram by "TBrowser" but whenever i try to see it by
>> "Draw()".
>> It shows an error message which is following.
>>
>> ============================================
>> root[1] myhist_2D->Draw()
>> Error: Symbol myhist_2D is not defined in current scope FILE:(tmpfile)
>> LINE:1
>> Error: Failed to evaluate myhist_2D->Draw()Possible candidates are...
>> filename line:size busy function type and name
>> =============================================
>>
>> Unfortunately, i am using an older version of root{4.00/08 December 2004 }
>> but there should be no problem of version with this basic thing.
>>
>> Cheers, Asif
>>
>>
>>
>>
>>
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>
Received on Mon Aug 09 2010 - 20:37:44 CEST