GetSngVec

GetSngVec(Graph, SngVecs, SngValV, LeftSV, RightSV)

Computes the singular values and left and right singular vectors of the adjacency matrix representing a directed Graph.

Parameters:

  • Graph: graph (input)

    A Snap.py graph or a network.

  • SngVecs: int (input)

    The number of singular values/vectors to compute

  • SngValV: TFltV (output)

    Computed singular values stored as a vector of floats

  • LeftSV: TFltVFltV (output)

    Computed left singular vectors stored as a vector of vectors of floats

  • RightSV: TFltVTFltV (output)

    Computed right singular vectors stored as a vector of vectors of floats

Return value:

  • None

The following example shows how to fetch the in-degrees for nodes in TNGraph, TUNGraph, and TNEANet:

import snap

Graph = snap.GenRndGnm(snap.PNGraph, 100, 1000)
SngVecs = 5
SngValV = snap.TFltV()
LeftSV = snap.TFltVFltV()
RightSV = snap.TFltVFltV()
snap.GetSngVec(Graph, SngVecs, SngValV, LeftSV, RightSV)
for value in SngValV:
    print("Singular value: %f" % value)
for vector in LeftSV:
    for value in vector:
        print("Left Singular Vector Value %f" % value)
for vector in RightSV:
    for value in vector:
        print("Right Singular Vector Value %f" % value)

Graph = snap.GenRndGnm(snap.PUNGraph, 100, 1000)
SngVecs = 5
SngValV = snap.TFltV()
LeftSV = snap.TFltVFltV()
RightSV = snap.TFltVFltV()
snap.GetSngVec(Graph, SngVecs, SngValV, LeftSV, RightSV)
for value in SngValV:
    print("Singular value: %f" % value)
for vector in LeftSV:
    for value in vector:
        print("Left Singular Vector Value %f" % value)
for vector in RightSV:
    for value in vector:
        print("Right Singular Vector Value %f" % value)

Graph = snap.GenRndGnm(snap.PNEANet, 100, 1000)
SngVecs = 5
SngValV = snap.TFltV()
LeftSV = snap.TFltVFltV()
RightSV = snap.TFltVFltV()
snap.GetSngVec(Graph, SngVecs, SngValV, LeftSV, RightSV)
for value in SngValV:
    print("Singular value: %f" % value)
for vector in LeftSV:
    for value in vector:
        print("Left Singular Vector Value %f" % value)
for vector in RightSV:
    for value in vector:
        print("Right Singular Vector Value %f" % value)

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