// Note: The pointer whose address is passed to TTree:: Branch must not // be destroyed (i.e. In case the object member is a TClonesArray, // it is processed as a TObject*, only one branch. * if splitlevel=2 ,this branch will automatically be split // into subbranches, with one subbranch for each data member or object // of the object itself. In case the object member is a TClonesArray, // the mechanism described in case C is applied to this array. * if splitlevel=1, this branch will automatically be split // into subbranches, with one subbranch for each data member or object // of the object itself. * if splitlevel=0, the object is serialized in the branch buffer. It should be either // a parent or derived class. * If className is used to specify explicitly the object type, the className must // be of a type related to the one pointed to by the pointer. * If className is not specified, Branch uses the type of p_object to determine the // type of the object. // => Case B // = // TBranch *branch = tree-> Branch(branchname, &p_object, bufsize, splitlevel)/ // TBranch *branch = tree-> Branch(branchname, className, &p_object, bufsize, splitlevel) // * p_object is a pointer to an object. you will not be able to read it back on a platform with a different // padding strategy).
#Simply fortran autosave code
Any other order will // result in a non-portable (even between CINT and compiled code on the platform) // TTree (i.e.
#Simply fortran autosave 64 Bit
The list of currently supported // types is given below: // - C : a character string terminated by the 0 character // - B : an 8 bit signed integer ( Char_t) // - b : an 8 bit unsigned integer ( UChar_t) // - S : a 16 bit signed integer ( Short_t) // - s : a 16 bit unsigned integer ( UShort_t) // - I : a 32 bit signed integer ( Int_t) // - i : a 32 bit unsigned integer ( UInt_t) // - F : a 32 bit floating point ( Float_t) // - D : a 64 bit floating point ( Double_t) // - L : a 64 bit signed integer ( Long64_t) // - l : a 64 bit unsigned integer ( ULong64_t) // - O : a boolean ( Bool_t) // * If the address points to a single numerical variable, the leaflist is optional: // int value // tree-> Branch(branchname, &value) // * If the address points to more than one numerical variable, we strongly recommend // that the variable be sorted in decreasing order of size. If the first variable does not have a type, it is // assumed of type F by default. (Characters // after the first are legal and will be appended to the visible // name of the leaf, but have no effect.) If no type is given, the // type of the variable is assumed to be the same as the previous // variable. (a specialized object for collections of same class objects) // // => Case A // = // TBranch *branch = tree-> Branch(branchname, address, leaflist, bufsize) // * address is the address of the first item of a structure // * leaflist is the concatenation of all the variable names and types // separated by a colon character : // The variable name and the variable type are separated by a // slash (/). (we expect this option be the most frequent) // C - a ClonesArray. (may be for C or Fortran structures) // B - any object (inheriting from TObject). // Various kinds of branches can be added to a tree: // A - simple structures or list of variables. // => TTree *tree = new TTree(name, title) // Creates a Tree with name and title.
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Making several branches is particularly interesting in the data analysis // phase, when one wants to histogram some attributes of an object (entry) // without reading all the attributes. (you know for example the list of entry numbers you want to process). Making one single branch and one single buffer can be the right choice // when one wants to process only a subset of all entries in the tree. // The ROOT user can decide to make one single branch and serialize one // object into one single I/O buffer or to make several branches. // Branches may be written to different files (see TBranch:: SetFile).
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A branch buffer is automatically compressed if the file // compression attribute is set (default).
![simply fortran autosave simply fortran autosave](https://www.dataquest.io/wp-content/uploads/2019/01/interface-screenshot.png)
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Variables of one branch are written to the // same buffer. Branch buffers may be // automatically written to disk or kept in memory until the Tree attribute // fMaxVirtualSize is reached. Each branch // has its own definition and list of buffers. It consists of a list of independent branches ( TBranch). * For the list of contributors see $ROOTSYS/README/CREDITS. * For the licensing terms see $ROOTSYS/LICENSE. * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.