Ask: how to transfer the parameter for the root scritpt

ROOT
1

Hello rooters,

I will use an example to show my question:

  1. my root script (DrawDiLepPlots.C) is like following:

void DrawDiLepPlots(int period=-1 ) {
cout<<" period: "<<period<<endl;
}

  1. If you run command-“root DrawDiLepPlots.C”, the output is:
    period: -1

May I ask how could I change the period by this command line mode?
I remember it is something like “root DrawDiLepPlots.C ( 3 )”. But it doesn’t work.

Can anybody tell me how to do it?

Thank you in advance!

Best regards

Lei

2

No spaces allowed in the call, try:
root DrawDiLepPlots.C(3)

3

Hi Pepe,

Thanks a lot! It works. :smiley:

Cheers

Lei

4

Actually, you have three possibilities:

root -l -b -q DrawDiLepPlots.C(3)
root -l -b -q DrawDiLepPlots.C\ (\ 3\ )

root -l -b -q "DrawDiLepPlots.C(3)"
root -l -b -q “DrawDiLepPlots.C ( 3 )”

root -l -b -q 'DrawDiLepPlots.C(3)'
root -l -b -q ‘DrawDiLepPlots.C ( 3 )’

Added: See, for example, ROOT User’s Guide -> Getting Started -> Start and Quit a ROOT Session

5

Hi Pepe,

Thanks for your detailed explanation.

May I ask whether there is a official document that mention these methods?
Because I have searched many place, e.g. user guide, tutorial. But maybe because of my careless, I didn’t find these methods.

Cheers

Lei

6

Hi Lei,

Those methods are described in the shell’s (bash, tcsh) manual and guides as they are the way that those tools provide to escape their own special characters ( parenthesis, quotes, etc.)

Cheers,
Philippe.

7

Hi,

and what if the parameter is not an integer, but a char* or a string? E.g., users’ guide has this example:

, and I want to pass the “text” into myMacro.C from another process. I.e., to create a variable, let’s say

, and pass it to myMacro.C, how do I do that with all these quotation marks?

Thanks!

8

Try:
root -l -b -q ‘myMacro.C("’${dateAndTime}’")’

9

Ok, that works, thanks!