Arrow-point ("<" not drawing

ROOT
1

Hi all,

Using root 5.34/22.
Using the following example, I try to draw an arrow using “<”, “<----” or “<|–”, etc.
However, the point “<” is not drawn.

The following attached files demonstrate the problem, They can just be pasted into a directory. It just draws an line without the arrow.

Does anybody have an idea why this does not work? I asked some other people in my group, but they did not manage to get the arrow to draw either.

Greetings,
Jelmer
test.C (3.06 KB)
single_v1j.root (4.42 KB)

2

Your script does not work:

/Users/couet/Downloads/test.C:20:18: error: called object type 'TVectorF *' (aka
      'TVectorT<Float_t> *') is not a function or function pointer
        int number= pmin(0);
                    ~~~~^
/Users/couet/Downloads/test.C:21:20: error: called object type 'TVectorF *' (aka
      'TVectorT<Float_t> *') is not a function or function pointer
  float pval = pmin(1);
3

It does work perfectly fine for me in any directory and I don’t see any problems with the code. Did it open the root file correctly for you?

root [0] 
Processing test.C...
hootgte: 266.4
jelmer@jelmer-N56JN:~/Downloads$
4

I am using root 6 which use a real C++ interpreter. I will modify your macro to make it work.

5

Ok, cleaning your macro I see you do:

  ar_1class.Draw("same");

Why option same ?

the TArrow option are listed here :

root.cern.ch/root/html/TArrow.h … w:TArrow@1

SAME does not exist.

6

1st of all. Thanks, removing same makes it an arrow.
2nd. Thanks for fixing my stupid mistake, I incorrectly assumed that arrow would need same to draw on the same canvas.
3rd. Thanks.

7

You’re welcome,

Coming back to your macro, you should really write real C++.

you should write:

int number= pmin[0];