2.3.7. Export to an ASCII file

In the same way as the data are imported from an ASCII file, we can also save the data of a TDataServer in an ASCII file. Currently, four methods of export are available in Uranie:

  • using the same format as that observed during import (“Salome Table”);

  • using a C file containing the data vectors that can be inserted in a C program.

  • using the NeMo format: the generated file is useful for the NeMo tool for constructing neural response surface developed at STMF.

  • using the JSON format: the generated file is easily transferable to any other program that include the JSON protocol. This file can also be read through the fileDataReadJSon method of a TDataServer object.

tdsGeyser = DataServer.TDataServer("tdsgeyser", "geyser database")
tdsGeyser.fileDataRead("geyser.dat")
tdsGeyser.addAttribute("y", "sqrt(x2) * x1")

tdsGeyser.exportData("newfile.dat") # (1)
tdsGeyser.exportDataHeader("newfile.C", "x1:x2:y") # (2)
tdsGeyser.exportDataNeMo("newfile.nemo", "x1:x2", "y", "x2<75.0") # (3)
tdsGeyser.exportDataJSon("newfile.json") # (4)

Data export from a TDataServer in an ASCII file

  1. Export the data of the TDataServer tdsGeyser in an ASCII file "newfile.dat":

    #NAME: tdsgeyser
#TITLE: Database of the geyser
#DATE: Tue Oct  9 15:41:29 2007
#COLUMN_NAMES: x1| x2| y| n__iter__

3.600000000e+00 7.900000000e+01 3.199749990e+01 1
1.800000000e+00 5.400000000e+01 1.322724461e+01 2
3.333000000e+00 7.400000000e+01 2.867155012e+01 3
2.283000000e+00 6.200000000e+01 1.797635998e+01 4
4.533000000e+00 8.500000000e+01 4.179219502e+01 5
...
2.150000000e+00 4.600000000e+01 1.458200946e+01 269
4.417000000e+00 9.000000000e+01 4.190334127e+01 270
1.817000000e+00 4.600000000e+01 1.232349358e+01 271
4.467000000e+00 7.400000000e+01 3.842658697e+01 272

  2. Exports the data of attributes x1, x2 and y of the TDataServer tdsGeyser in the ASCII file "newfile.C" A format “Header”.

    // File "newfile.C" generated by ROOT v5.17/04
// DateTime Tue Oct  9 15:41:30 2007
// DataServer: Name="tdsgeyser" Title="Database of the geyser" Select=""

#define essai_nPattern 272

//  Attribute Name="x1" Title=" x_{1}"
Double_t x1[essai_nPattern] = {
3.600000000e+00,
1.800000000e+00,
...
1.817000000e+00,
4.467000000e+00,
};
// End of attribute x1

//  Attribute Name="x2" Title=" #delta x_{2}"
Double_t x2[essai_nPattern] = {
7.900000000e+01,
5.400000000e+01,
...
1.232349358e+01,
3.842658697e+01,
};
// End of attribute y

// End of File newfile.C

  3. Exports the data of the TDataServer tdsGeyser in an ASCII file newfile.nemo with format NeMo with x1:x2 as input vector, “y” as output and applying a filter “x2<75.0”

    #NombreExemples 126
#NombreEntrees 2
#NombreSorties 1

1.800000000e+00 5.400000000e+01 1.322724461e+01 
3.333000000e+00 7.400000000e+01 2.867155012e+01 
2.283000000e+00 6.200000000e+01 1.797635998e+01 
2.883000000e+00 5.500000000e+01 2.138090024e+01
...
2.150000000e+00 4.600000000e+01 1.458200946e+01 
1.817000000e+00 4.600000000e+01 1.232349358e+01 
4.467000000e+00 7.400000000e+01 3.842658697e+01

  4. Exports the data of the TDataServer tdsGeyser in an ASCII file newfile.json with format JSON.

    
{
  "_metadata" : 
  {
    "_comment" : "CurrentComment",
    "date" : "Fri Oct 28 10:41:44 2016",
    "short_names" : [ "x1", "x2", "geyser__n__iter__" ],
    "table_description" : "Les donnees du geyser",
    "table_name" : "geyser",
    "types" : [ "D", "D", "D" ],
    "units" : [ "Sec", "", "" ]
  },
  "items" : 
  [
    
    {
      "geyser__n__iter__" : 1.0,
      "x1" : 3.60,
      "x2" : 79.0
    },
    
    {
      "geyser__n__iter__" : 2.0,
      "x1" : 1.80,
      "x2" : 54.0
    },

      
      
    {
      "geyser__n__iter__" : 272.0,
      "x1" : 4.4670,
      "x2" : 74.0
    }
  ]
}

Summary: Exportation of a TDataServer to ASCII format

  • exportData ( const char* filename, const char * varexp=”*”, const char * select=”” )

    Exportation of the data of attributes “varexp” of the TDataServer in the file “filename” in ASCII format, “Salome table” type, applying the filter contained in “select”. The filter “select” is added to the permanent selection (c.f. Pattern selection) of the TDataServer.

  • exportDataJSon ( const char* filename, const char * varexp=”*”, const char * select=”” )

    Exportation of the data of attributes “varexp” of the TDataServer in the file “filename” in JSON format, applying the filter contained in “select”. The filter “select” is added to the permanent selection (c.f. Pattern selection) of the TDataServer.

  • exportDataHeader ( const char* filename, const char * varexp=”*”, const char * select=”” )

    Exportation of the data of attributes “varexp” of the TDataServer in the file “filename” in ASCII format for the use of a C/C++ program. The “select” filter is added to the permanent selection (c.f. Pattern selection) of the TDataServer.

  • exportDataNeMo ( const char* filename, const char * varexpinput, const char * varexpoutput, const char * select=”” )

    Exportation of the TDataServer data in the file “filename” TDataServer in ASCII format NeMo with attributes “varexpinput” as inputs (separated by the character “:”) and attributes “varexpoutput” as outputs (separated by the character “:”) and applying the filter contained in option. The “select” filter is added to the the permanent selection (c.f. Pattern selection) of the TDataServer