doc/master/vo005__Combinations_8py.html

import ROOT

from ROOT.VecOps import Take, Combinations


# RVec can be sorted in Python with the inbuilt sorting function because

# PyROOT implements a Python iterator

v1 = ROOT.RVecD(3)

v1[0], v1[1], v1[2] = 1, 2, 3

v2 = ROOT.RVecD(2)

v2[0], v2[1] = -4, -5


# To get the indices, which result in all combinations, you can call the

# following helper.

# Note that you can also pass the size of the vectors directly.

idx = Combinations(v1, v2)


# Next, the respective elements can be taken via the computed indices.

c1 = Take(v1, idx[0])

c2 = Take(v2, idx[1])


# Finally, you can perform any set of operations conveniently.

v3 = c1 * c2


print("Combinations of {} and {}:".format(v1, v2))

for i in range(len(v3)):

    print("{} * {} = {}".format(c1[i], c2[i], v3[i]))

print


# However, if you want to compute operations on unique combinations of a

# single RVec, you can perform this as follows.


# Get the indices of unique triples for the given vector.

v4 = ROOT.RVecD(4)

v4[0], v4[1], v4[2], v4[3] = 1, 2, 3, 4

idx2 = Combinations(v4, 3)


# Take the elements and compute any operation on the returned collections.

c3 = Take(v4, idx2[0])

c4 = Take(v4, idx2[1])

c5 = Take(v4, idx2[2])


v5 = c3 * c4 * c5


print("Unique triples of {}:".format(v4))

for i in range(len(v5)):

    print("{} * {} * {} = {}".format(c3[i], c4[i], c5[i], v5[i]))

len
Option_t Option_t TPoint TPoint const char GetTextMagnitude GetFillStyle GetLineColor GetLineWidth GetMarkerStyle GetTextAlign GetTextColor GetTextSize void char Point_t Rectangle_t WindowAttributes_t Float_t Float_t Float_t Int_t Int_t UInt_t UInt_t Rectangle_t Int_t Int_t Window_t TString Int_t GCValues_t GetPrimarySelectionOwner GetDisplay GetScreen GetColormap GetNativeEvent const char const char dpyName wid window const char font_name cursor keysym reg const char only_if_exist regb h Point_t winding char text const char depth char const char Int_t count const char ColorStruct_t color const char Pixmap_t Pixmap_t PictureAttributes_t attr const char char ret_data h unsigned char height h Atom_t Int_t ULong_t ULong_t unsigned char prop_list Atom_t Atom_t Atom_t Time_t UChar_t len
Definition TGWin32VirtualXProxy.cxx:249

format
Option_t Option_t TPoint TPoint const char GetTextMagnitude GetFillStyle GetLineColor GetLineWidth GetMarkerStyle GetTextAlign GetTextColor GetTextSize void char Point_t Rectangle_t WindowAttributes_t Float_t Float_t Float_t Int_t Int_t UInt_t UInt_t Rectangle_t Int_t Int_t Window_t TString Int_t GCValues_t GetPrimarySelectionOwner GetDisplay GetScreen GetColormap GetNativeEvent const char const char dpyName wid window const char font_name cursor keysym reg const char only_if_exist regb h Point_t winding char text const char depth char const char Int_t count const char ColorStruct_t color const char Pixmap_t Pixmap_t PictureAttributes_t attr const char char ret_data h unsigned char height h Atom_t Int_t ULong_t ULong_t unsigned char prop_list Atom_t Atom_t Atom_t Time_t format
Definition TGWin32VirtualXProxy.cxx:249

ROOT::VecOps::RVec< double >

ROOT::VecOps
Definition TCollectionProxyInfo.h:42