Re: tutorial: how to create a tree

Valery Fine (fine@bnl.gov)
Sun, 2 Aug 1998 17:41:48 -0500


Dear Elemer Nagy

On 2 Aug 98 at 12:19, you wrote:

> I wanted to execute the sample job of Valery Fine
> "creation of a root tree".

First I'd like to beg a pardon since I am not the author of that
code but Rene Brun and my name is mentioned there by mistake.
>
> This program contains statements of
>
> #include "TROOT.h"
>
> etc.
>
> When executing my macro containing these statements,
> it gives the following error:
>
> Error: source file "TROOT.h" cannot open
> FILE:/afs/fnal.gov/files/home/room3/enagy/root/tutor/./crea_tree.C
> LINE:77 NULL
>
This example is NOT a macro. It is a piece of the STAND-ALONE code
to be compiled with the native compiler and run with no extra ROOT
executable.

This explains the message you got. An interactive ROOT includes all
ROOT classes pre-compiled. This means one needs no extra "include" to
define any ROOT class to use it. These include statements must be
supplied for the "native" compiler only to create "stand-alone"
application (it is useful for the batch processing for example)

>
> How can/should one use them in a macro?
>

The working example of "how to manage the user defined tree" can be
found under "test" subdirectory of the ROOT destribution kit.

You may find in there:

1. Makefile to create:

1.1. stand_alone code
1.2. share library to be used within a "normal" ROOT session

2. Several ROOT macros. All of them assume the "Event" share
library with ROOT dictionary has been created / loaded(see
above)

Please, look this "test" sub-directory up. Very likely it
answers your questions.

With my best regards,
Valery
=================================================================
Dr. Valeri Faine (Fine)
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Dr. Valery Fine Telex : 911621 dubna su
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