How can i change default dir

ROOT
1

Hi rooters,
I’ve written :
ifstream in(“al_1K.data”);
compiler has not found the data file.
And i’ve written:
ifstream in(“c:\root\macros\data files\al_K.data”)->Is this correct?;
but again has not found the data file.
When i replace the data file in Desktop it finds.
How can i change default place or deroctory (where root can open default)of data file.

2

Hello

Normally root is already the default folder so you don’t have to include that in your path. Also you have to use / instead of .
I would suggest to try it using:

ifstream in("macros/data files/al_K.data")

But actually I don’t know the command like you posted it. The following works in order to open the energie_SRIM.txt file, which is stored in the folder macros/crosssection/daten/, and to stores it to the array energy

using namespace std;
    const Int_t n=2000;
    Double_t energy[n];

    Int_t i = 0;
    Double_t senergy;
    ifstream inFile;
    inFile.open("macros/crosssection/daten/energie_SRIM.txt");
    while (inFile >> senergy) {
	energy[i]=senergy;
	i++;
    }
3

Hi,

To change the current file system directory within a ROOT session callgSystem->cd(where_I_want_to_be);

Cheers,
Philippe