**Adjacency matrix vs Adjacency list?**When is it proper to use which ?
Am i correct in the assumption that the adjacency matrix must have way
shorter lookup-times(finding an element) especially for a large amount of
nodes, since it can simply be implemented as a "double array" i.e. no search
needed. For large amount of nodes the adjacency matrix should consume a lot
of memory.
Consider the Ford-Fulkersson method:
Which representation(adj.matrix or adj.list) provides for the fastest
execution of that algorithm ? Sure for large amounts of nodes an adj. matrix
representation would use up a lot of memory, but that wouldn�t...

**Adjacency**A well-known approach to representing long strings is to denote them as a
set of shorter strings with nothing but white space or newline characters
between them. Such a set of adjacent strings is to be read as one string,
and creates no great parsing problem. It's suprising that this technique is
not more widely adopted. In SWI Prolog, for instance, long format strings
may contain a line continuation character, which is extra syntax.
Furthermore, it clashes with an automatic source code formatter which tries
to indent lines.
In Prolog, adjacency could be employed for long lists, which are...

**node-node adjacency matrix to a node-arc adjacency matrix**I have been trying to figure out how to create a arc-node adjacency matrix from a node-node adjacency matrix, for example:
node-node adj
A = [0 1 0 1 1;
0 0 1 1 0;
0 0 0 1 1;
0 0 0 0 1;
0 0 0 0 0];
looking for the following links: 1-2,1-4,1-5,2-3,2-4,3-4,3-5,4-5
arc-node adj
B =[ 1 1 1 0 0 0 0 0
-1 0 0 1 1 0 0 0
0 0 0 -1 0 1 1 0
0 -1 0 0 -1 -1 0 1
0 0 -1 0 0 0 -1 -1];
Any help will be greatly appreciated:
I have tried to develop a for loop using "A" and assigning -1 to the tail end of the link but with no succes...

**adjacency matrix**Need help in solving the problem below. Any help would be highly
appreciated
Implement the adt graph as a C++ class first by using an adjacency
matrix to represent the graph then by using an adjacency list to
represent the graph. Extend the programming problem by adding adt
operations such as Isconnected and HasCycle. also include operations
that perform a topological sort for a directed graph without cycles.
Determine the dfs and bfs spanning trees for a connected graph and
determine a minimum spanning tree for a connected undirected graph.
...

**Adjacency List**Could someone please rpovide an example how to generate Adjacency
List (with Uniform Skewed, and Two-Tier distributions)? Then convert
the adjacency list into the corresponding adjacency matrix. Once the
matrix is in place ... How to create "Ordered/Connected" pairs and
create the Vertex Coloring graph
Thank you!
Leo
...

**Adjacency graph**Hi
How do I get the adjacency graph for a row data (one raw matrix) in Matlab
Thank you
Eiman
...

**adjacency problem**suppose I have a matrix M {assign}24 24 {rho}{iota}576
I'm trying to efficiently generate an array R that contains adjacency
information about the entries of M. for example, my adjaceny rule is such
that for M[1;1] which is 1, I would want 1 2 25 26 and for M[1;2] I want 1 2
3 25 25 27 and for M[2;2] I want 1 2 325 26 27 49 50 51 and so on.
The number of adjacent values can be either 4, 6, or 9 depending if the cell
is a corner, edge but not corner, or interior. The output matrix R needs to
be rectangular so in the case of a corner or edge the adjacency values can
be repeated ...

**adjacency matrix**Hi everyone,
I wrote a code and i want to create an adjacency matrix for that by selecting one of the points marked with red
clc
clear
clf
L = linspace(0,2.*pi,100); xv = cos(L)';yv = sin(L)';
% 6 yi artt?r?nca yuvarla?a yakla??yor. Kenar say?s? k?saca o.
xv = [xv ; xv(1)]; yv = [yv ; yv(1)];
xmin = -5;
xmax = 5;
npts = 500;
x = xmin + (xmax-xmin)*rand(npts,1);
ymin = -5;
ymax= 5;
y = ymin + (ymax-ymin)*rand(npts,1);
p=[x y];
in = inpolygon(x,y,xv,yv);
tri = delaunay(x,y);
triplot(tri,x,y)
hold on
plot(xv,yv,x(in),y(in),'r*',x(~...

**Adjacent selector**I was just experimenting with adjacent selectors today.
Isn't the HTML and CSS below good enough to
set the color orange on "li + span"???
(It didn't work in latest versions of Firefox or Chrome)
<!DOCTYPE html>
<html><head><title>CSS</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<style>
li + span {
color: orange;
}
</style>
</head>
<body>
<ul>
<li>Black</li>
<li><span>!ORANGE!</span></li>
&...

**OSPF question about adjacencies**I'm a bit confused about adjacencies. Is the router adjacent only to other
routers that are directly connected to an interface, or could it be adjacent
to any router that it gets a hello packet from that contains it's own
RouterID?
Also, are hello packets sent out only to directly connected routers, or do
the directly connected routers also pass this hello packet to all other
routers?
Finally, what is the mechanism that allows a DR and BDR to send out link
state packets on the entire network that makes sure all routers, within the
OSPF area, receive all the link states?
-Sameer
...

**Finding Adjacent Vertices**Given a graph G = (V, E) and an element v of V, what is the quickest
way to find the vertices adjacent to v?
The fastest algorithm I can think of is this one:
for each edge (u, w) in E do
if u = v then return w
if w = v then return u
done
which takes time proportional to |E|. Given the adjancency matrix A of
G, I could find the adjacent vertices in time proportional to |V| like
so:
for each u in V do
if A[v][u] = 1 then return u
done
However, I would have to deal with building A first which takes at
least time proportional to |E| (since every edge must be visited to
determine whethe...

**IS-IS Routers not establishing adjacency**Hi,
I am working through an IS-IS configuration in the SYBEX BSCI book. I
followed the example configs exactly but my routers can not establish
adjacency. Any IS-IS gurus with any ideas?
I don't want to post configs yet as the config from the sample chapter
is very straightforward. I'm probably missing a trick.
Thanks
<alex_edwards2000@hotmail.com> wrote in message
news:1143484789.016211.202150@g10g2000cwb.googlegroups.com...
> Hi,
>
> I am working through an IS-IS configuration in the SYBEX BSCI book. I
> followed the example configs exactly but my routers can...

**adjacency matrix for a graph**Hi guys,
I am trying to find the adjacency matrix for a graph A=(aij) which is constructed through this rule:
aij=
1 ,if there is an edge connecting Pj to Pi.
0 .otherwise.
The graph has ten 10 vertices : P1,P2,....,P5. So, the dimension of the matrix is 10x10.
>> clear
>> n=5; % n= no. of vertices.
>> A=zeros(n,n) % preallocatation of the matrix.
A =
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
>> % if there is an edge connecting Pj t...

**ISIS Adjacency Problem**Hi all,
first let me tell I' not ver familar with ISIS...yesterday night I try
to troubleshoot a adjacency problembetween two cisco systems....
on is a AS5800 and on the other side a cisco 7609
On both systems are IOS version 12.2
The connectivity is done over fiber SX gigabit ports...because the
systems are in the same room and side by side.
The AS is redundant connected to 2 7606
So from AS gi 6/0 is going to router 1 gig 2/21 and gig6/1 is going
to router 2/21
When I debug on the AS that it sends and receives clns packets over
6/1...but it only send over 6/0 and doesn't receive.....

**triangle strip with adjacency**Hey, is it just me or does anyone else think Figure 2.6 is a bit
weird? i'm looking at the version at:
http://www.opengl.org/registry/doc/glspec41.core.20100725.pdf
I understand the doc below it, but the figure just seems wrong. A
bunch of issues:
1) On the top left, the triangle connecting 3,5,6 *should* be an
adjacent triangle, but it is drawn solid.
2) On the top right, vertex 9 should really be vertex 8, and the
triangle connecting 7.5,8 should be adjacent, but it is drawn solid
3) The bottom two images look correct, but they are identical (not
sure why they are repeated)
On Sa...

**baselines in adjacent minipages**hello - i have posted this question some time earlier, but probably
never hit someone's specific latex nerv. i am posting it here again
with a different problem explication:
i am creating a package for a boxed logic calculus a la
kalish-montague. for those not familiar with it: typesettingwise it
consists of 3 columns - the 1st for line numbers, the third for
comments and the middle one consists of multiply framed lines (with
different height math symbols) like
1 line 1 comment 1
___________
2 | line 2 | comment 2
3 | line 3 | comme...

**building an adjacency matrix**Hello,
I would like to load data into matlab and then build an adjacency matrix. my data is in excel format.
1 2 45
1 4 44
1 5 10
...
...
10 2 567
10 5 45
10 6 2
...
...
it is a 40x40 matrix where the elements of the matrix are in the 3rd column above.
It is the first time I am using matlab.. please help.
Thank you
"s.naaz " <noune19@gmail.com> wrote in message <h4s8ep$gec$1@fred.mathworks.com>...
> Hello,
>
> I would like to load data into matlab and then build an adjacency matrix. my data is in excel format.
> 1 2 45
> 1 4 44
> 1 5 10
> ..
&...

**to make a adjacent matrix**how to make a 32 by 32 connection matrix , in which every node have
16 connection by bi-direction, it means aij=aji (symmetric matrix)
selection of node is random.
...

**Adjacency matrix compression..?**Hi there,
Given a 3d polygon model, adjacency matrix is a matrix with rows and columns
labeled by graphics vertices, with a 1 or 0 in position (Vi,Vj) according
to whether Vi and Vj are adjacent or not. The element of the matrix is
usually 0. It seems like a black-white images but black color is in the
majority. Can anybody have any simple idea to compress the kind of matrix?
Thanks in advance.
Best Regards,
Brian
Brian <cuckoo@cs.nchu.edu.tw> wrote:
> Given a 3d polygon model, adjacency matrix is a matrix with rows and columns
> labeled by graphics vertices, with a 1 or 0 i...

**A Question about adjacency matrix**Dear Sir
I have a question about the adjacency matrix
My question:
How to get adjacency matrix for a graph composed of points in {x,y,z} ?
Thanks in advance
Marwa Ali
An adjacency matrix describes relationship between nodes (connection
or no connection). There is often, but not necessarily a weight
involved. For nodes that are 3D coordinates one could use one of
several distance functions Mathematica has built-in, such as
EuclideanDistance, as weight. But you can think of many others that
do not involve distance in 3D at all. Any matrix element m[[i,j]]
describes t...

**convert into adjacency matrix**Hi all!
I have a set of points (obtained using another tool) which I need to represent in the form of an adjacency matrix so that I can view the connectivity between these points. For e.g.
5 2 6 9 4 7 3
3 1 6 2 5 8 4
2 3 5 1 4 6 5 % points represent a path
Is there any function that I can use to indicate the link between say, 5 and 6? Or do I need to do:
links=zeros(7,7);
links(5,2)=1;
...
like this for all the points..but isn't this tedious?
Thanks for your replies,
Marat
"Marat " <nemesis_810@yahoo.com> wrote in message <grhpsp$pin$1@fred.mathworks.com>...
>...

**Find adjacent points**Given two contiguous disjoint sets Ai & Aj of (x,y) coordinates, is there an efficient method of determining which points (xi,yi) in Ai and (xj,yj) in Aj are adjacent; i.e. such that |xi-xj|<=1 and |yi-yj|<=1? I'm currently using a for...end loop to test the kth coordinate in one set against the vectorised representation of the other in a find statement. This seems inefficient, especially for large sets. Is there a fully vectorised method of achieving the same end?
"Brian Flemming" <qzxj37@googlemail.com> wrote in message <ibhqg1$a4o$1@fred.mathworks.com...

**Adjacency lists with sqlalchemy...** I'm desperately trying to declare an adjacency list table with
declarative_base() but I can't figure it out. Strangely, all the
documentation avoids declarative_base() like the plague and does everything
the hard way. What the hell is this thing for if we're not supposed to use
it?
If anyone can show me how to declaratively create ORM adjacency list or
explain to me why this can't be done, I'd be very grateful.
Thank you!
...

**Adjacent array elements**Hi all!
I have a huge 2-dimensional array. For each element of this array I need
to get all adjacent elements.
a b c d e
f g h i j
k l m n o
p q r s t
u v w x y
For example, for an element 'm' - adjacent elements are [g h i l n q r
s]. Is there an efficient way to get those adjacent elements? The
solution should be 'extendable' because there is the same problem for 3D
and 4D arrays.
I don't want to write it in a loop like offsetting by one in each
dimension. I would like to know if a 'vectorized' solution exists.
I'll be glad for any advise.
Thank you...

**Adjacency matrix and graph**-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Hi,
Given an adjacency matrix A of a graph G, G can be drawn easily. Is
there a package or a program which would allow me to introduce A, and
output G, to put G in a LaTeX document?
If so, how, and which one?
Thanks.
- --
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
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