[ROOT] Problem creating directories in TFile

[James Jackson]

I have a TFile, within which I create a directory (e.g. with file-

mkdir("Dir1")). If, from another section of my code, and given a

pointer to the file object, I run the following code:

file->cd();
file->cd("Dir1");
file->mkdir("Dir2");
file->cd("Dir2");

The result is that Dir2 is created under the file 'root' directory,
and not as a subdirectory of Dir1. This is with version 5.13.04e.

Any help appreciated,

Regards,
James Jackson

[Roland Kuhn]

Hi James!

Post by James Jackson
I have a TFile, within which I create a directory (e.g. with file-

mkdir("Dir1")). If, from another section of my code, and given a

file->cd();

This sets gDirectory = file.

Post by James Jackson
file->cd("Dir1");

This makes the previous line superfluous by setting gDirectory to
file:/Dir1.

Post by James Jackson
file->mkdir("Dir2");

This tells file to create a new subdirectory, which will of course be
file:/Dir2. Should you have used gDirectory->mkdir("Dir2") that would
have been different.

Post by James Jackson
file->cd("Dir2");

This sets gDirectory to file:/Dir2

Post by James Jackson
The result is that Dir2 is created under the file 'root' directory,
and not as a subdirectory of Dir1. This is with version 5.13.04e.

I don't see anything wrong here...

Ciao,
Roland

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[Datao Gong]

hi,Rooters,
I have a question about using TF1. I have to define a user-defined
function to fit histogram. If i define this function as a class member
function, it has to be a static member function. This requirement
bring me some troubles to pass member data to configure this function.
If i do not want to define the member data to be static type,
is there any easy way to pass by this problem?

Thanks a lot,

Datao

[Rene Brun]

Only static functions are accepted by the fitting functions.
In the CVS version an extension of TH1::Fit accepts fits with member
functions of classes
deriving from TF1 and redefining the function TF1::EvalPar. See an
example of use
in the attachment.

Rene Brun

Post by Datao Gong
hi,Rooters,
I have a question about using TF1. I have to define a user-defined
function to fit histogram. If i define this function as a class member
function, it has to be a static member function. This requirement
bring me some troubles to pass member data to configure this function.
If i do not want to define the member data to be static type,
is there any easy way to pass by this problem?
Thanks a lot,
Datao

[Datao Gong]

Thanks Rene! It is what i want.:)

Datao

Post by Rene Brun
Only static functions are accepted by the fitting functions.
In the CVS version an extension of TH1::Fit accepts fits with member
functions of classes
deriving from TF1 and redefining the function TF1::EvalPar. See an example of
use
in the attachment.
Rene Brun

Post by Datao Gong
hi,Rooters,
I have a question about using TF1. I have to define a user-defined
function to fit histogram. If i define this function as a class member
function, it has to be a static member function. This requirement
bring me some troubles to pass member data to configure this function.
If i do not want to define the member data to be static type,
is there any easy way to pass by this problem?
Thanks a lot,
Datao

[Rene Brun]

It looks like you have 0 or negative values in your scaler.eps plot.
I suggest setting a minimum (say 1) in your histogram.

Rene Brun

Hello，
I want to draw 3 curves in logarithm coordinate in a PAD,but failed to get
a figure like log.eps after getting the scaler.eps figure.
What can I do ? Thanks!
with best wishes,
Fengrong Zhu
Institute of High Energy Physics,
C.A.S P.R.C
--
Open WebMail Project (http://openwebmail.org)
------- End of Forwarded Message -------
with best wishes,
Fengrong Zhu
Institute of High Energy Physics,
C.A.S P.R.C
--
Open WebMail Project (http://openwebmail.org)

[Olivier Couet]

In case you still have the problem after René's suggestion, send me a small example macro reproducing the problem.
Cheers, Olivier Couet

-----Original Message-----
From: owner-***@pcroot.cern.ch [mailto:owner-***@pcroot.cern.ch] On Behalf Of Rene Brun
Sent: Tuesday, April 03, 2007 4:25 PM
To: Zhu FengRong
Cc: ***@pcroot.cern.ch
Subject: [ROOT] Re: Fw: about logarithm

It looks like you have 0 or negative values in your scaler.eps plot.
I suggest setting a minimum (say 1) in your histogram.

Rene Brun

Hello，
I want to draw 3 curves in logarithm coordinate in a PAD,but failed
to get a figure like log.eps after getting the scaler.eps figure.
What can I do ? Thanks!
with best wishes,
Fengrong Zhu
Institute of High Energy Physics,
C.A.S P.R.C
--
Open WebMail Project (http://openwebmail.org)
------- End of Forwarded Message -------
with best wishes,
Fengrong Zhu
Institute of High Energy Physics,
C.A.S P.R.C
--
Open WebMail Project (http://openwebmail.org)

[Datao Gong]

Rene,
Yes. It works. I defined a class myFit inherited from TF1.
class MyFit : public TF1
{
...
ClassDef(MyFit,1)
};

ClassImp(MyFit);

In the fitting routine:
TH1F* th1;
MyFit* fitfunc = new MyFit("myfit",minX,maxX);
...
th1->Fit(fitfunc,option);
...

Then i write the fitted histogram to a root file.

th1->Write();
...

The problem is when i use function pointer and TF1, the fitted curve
appears when i draw the histogram in the root file. When i use MyFit,
the fitted curve does not show when i re-draw the histogram in the root
file. The fitted parameter box does show the fitted parameters. Do i need
to do something to save the curve?

Thanks,

Datao

Post by Rene Brun
Only static functions are accepted by the fitting functions.
In the CVS version an extension of TH1::Fit accepts fits with member
functions of classes
deriving from TF1 and redefining the function TF1::EvalPar. See an example of
use
in the attachment.
Rene Brun

Post by Datao Gong
hi,Rooters,
I have a question about using TF1. I have to define a user-defined
function to fit histogram. If i define this function as a class member
function, it has to be a static member function. This requirement
bring me some troubles to pass member data to configure this function.
If i do not want to define the member data to be static type,
is there any easy way to pass by this problem?
Thanks a lot,
Datao

[Rene Brun]

Datao,

Are you using the CVS version? Fitting with a function derived from TF1
will work with any version
of ROOT, but the drawing of the function will only work with the CVS
version.

Rene Brun

Post by Datao Gong
Rene,
Yes. It works. I defined a class myFit inherited from TF1.
class MyFit : public TF1
{
...
ClassDef(MyFit,1)
};
ClassImp(MyFit);
TH1F* th1;
MyFit* fitfunc = new MyFit("myfit",minX,maxX);
...
th1->Fit(fitfunc,option);
...
Then i write the fitted histogram to a root file.
th1->Write();
...
The problem is when i use function pointer and TF1, the fitted curve
appears when i draw the histogram in the root file. When i use MyFit,
the fitted curve does not show when i re-draw the histogram in the root
file. The fitted parameter box does show the fitted parameters. Do i
need to do something to save the curve?
Thanks,
Datao

Post by Rene Brun
Only static functions are accepted by the fitting functions.
In the CVS version an extension of TH1::Fit accepts fits with member
functions of classes
deriving from TF1 and redefining the function TF1::EvalPar. See an
example of use
in the attachment.
Rene Brun

Post by Datao Gong
hi,Rooters,
I have a question about using TF1. I have to define a user-defined
function to fit histogram. If i define this function as a class member
function, it has to be a static member function. This requirement
bring me some troubles to pass member data to configure this function.
If i do not want to define the member data to be static type,
is there any easy way to pass by this problem?
Thanks a lot,
Datao

[Gero Flucke]

Post by James Jackson
I have a TFile, within which I create a directory (e.g. with file-

mkdir("Dir1")). If, from another section of my code, and given a pointer to

file->cd();
file->cd("Dir1");
file->mkdir("Dir2");
file->cd("Dir2");
The result is that Dir2 is created under the file 'root' directory, and not as
a subdirectory of Dir1. This is with version 5.13.04e.

Dear James,
what you probably want to do is

file->cd("Dir1");
gDirectory->mkdir("Dir2");
file->cd("Dir1/Dir2");

Cheers

Gero

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