The version I was using is igraph-0.6.5-msvc. I used two layout funcitons
from layout.c,the first one is igraph_layout_random(const igraph_t *graph,
igraph_matrix_t *res),and the second one
is igraph_layout_fruchterman_reingold(const igraph_t *graph,
igraph_matrix_t *res,
igraph_integer_t niter, igraph_real_t maxdelta,
igraph_real_t area, igraph_real_t coolexp,
igraph_real_t repulserad, igraph_bool_t use_seed,
const igraph_vector_t *weight,
const igraph_vector_t *minx,
const igraph_vector_t *maxx,
const igraph_vector_t *miny,
const igraph_vector_t *maxy).
The specific process is as follows:
#include<stdio.h>
#include <iostream>
#include <sstream>
#include <fstream>
#include <string>
#include <vector>
#include <igraph.h>
using namespace std;
int main()
{
vector<int> X;//store X coordinate
vector<int> Y;//store Y coordinate
char *filepath="E:\\ltt\\dataset\\betweeness.csv";
igraph_t g;
FILE *input;
igraph_integer_t N,Ne,Maxdegree;
input=fopen(filepath,"r");
igraph_read_graph_edgelist(&g, input, 0, 0);
fclose(input);
N=igraph_vcount(&g);//number of vertex
Ne=igraph_ecount(&g);//number of edge
igraph_matrix_t res_1;
igraph_matrix_init(&res_1,N,2);
///Set the parameters as the discription
igraph_integer_t niter=500;
igraph_real_t maxdelta=N;
igraph_real_t area=N*N;
igraph_real_t coolexp=1.5;
igraph_real_t repulserad=N*N*N;
igraph_bool_t use_seed=false;
igraph_vector_t weight;
igraph_vector_t minx;
igraph_vector_t maxx;
igraph_vector_t miny;
igraph_vector_t maxy;
igraph_vector_init(&weight,Ne);
igraph_vector_init(&minx,N);
igraph_vector_init(&maxx,N);
igraph_vector_init(&miny,N);
igraph_vector_init(&maxy,N);
igraph_vector_init(&maxy,N);
igraph_vector_init(&maxy,N);
//igraph_layout_random(&g,&res_1);
igraph_layout_fruchterman_reingold(&g,&res_1,niter,maxdelta,area,coolexp,repulserad,use_seed,&weight,&minx,&maxx,&miny,&maxy);
int s=igraph_matrix_nrow(&res_1);
for(int i=0;i<s;i++)
{
X.push_back(MATRIX(res_1,i,0));
Y.push_back(MATRIX(res_1,i,1));
}
for(int i=0;i<X.size();i++)
{
cout<<"x"<<i<<"="<<X[i]<<","<<"y"<<i<<"="<<Y[i]<<endl;
}
igraph_matrix_destroy(&res_1);
}
and the execution result is like this:
x0=0,y0=0
x1=0,y1=0
x2=0,y2=0
x3=0,y3=0
x4=0,y4=0
x5=0,y5=0
x6=0,y6=0
x7=0,y7=0
x8=0,y8=0
x9=0,y9=0
x10=0,y10=0
x11=0,y11=0
x12=0,y12=0
x13=0,y13=0
x14=0,y14=0
x15=0,y15=0
x16=0,y16=0
x17=0,y17=0
x18=0,y18=0
No matter whether I used the "igraph_layout_random()" or the
"igraph_layout_fruchterman_reingold()",the results are both as mentioned
above.It means that the X cooridnate and the Y coordinate in the matrix
res_1 is zero,.So it can't layout the graph. I don't know why and what's
wrong with it .
Hope for your help .Thank you!
Tian
Li
2014-06-09 0:00 GMT+08:00 <[email protected]>:
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> 1. Problems about igraph-c library generating layouts for graph (??)
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> 3. igraph_haplotype network_vertex.shape = "pie"_problem (Axel Hille)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 7 Jun 2014 23:40:49 +0800
> From: ?? <[email protected]>
> To: [email protected]
> Subject: [igraph] Problems about igraph-c library generating layouts
> for graph
> Message-ID:
> <
> capdtouqwnswbhs3bzjnx47nhc6mikzbnp4bpt4ql1b-wio9...@mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hello:
> I found some problems when I used the igraph-c library generating layouts
> for graph.When I used the igraph-layout-random and the
> igraph-layout-frucherman-
> reingold the matrix object which contains the result is zero.It cann't
> layout the graph.I don't know why,so I want to ask about it.
> I'm looking forward to your reply.Best regards.
>
>
>
>
>
> Tian Li
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> ------------------------------
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> Message: 2
> Date: Sat, 7 Jun 2014 12:54:24 -0400
> From: G?bor Cs?rdi <[email protected]>
> To: Help for igraph users <[email protected]>
> Subject: Re: [igraph] Problems about igraph-c library generating
> layouts for graph
> Message-ID:
> <CABtg=KnF3ft398q45CB3vZ4Kmh=
> [email protected]>
> Content-Type: text/plain; charset=UTF-8
>
> Most probably you are doing something wrong. We cannot tell you what,
> because you did not tell us what you did.
>
> Gabor
>
> On Sat, Jun 7, 2014 at 11:40 AM, ?? <[email protected]> wrote:
> > Hello:
> > I found some problems when I used the igraph-c library generating
> layouts
> > for graph.When I used the igraph-layout-random and the
> > igraph-layout-frucherman-
> > reingold the matrix object which contains the result is zero.It cann't
> > layout the graph.I don't know why,so I want to ask about it.
> > I'm looking forward to your reply.Best regards.
> >
> >
> >
> >
> >
> > Tian Li
> >
> >
> > _______________________________________________
> > igraph-help mailing list
> > [email protected]
> > https://lists.nongnu.org/mailman/listinfo/igraph-help
> >
>
>
>
> ------------------------------
>
> Message: 3
> Date: Sat, 7 Jun 2014 22:53:45 +0200
> From: "Axel Hille" <[email protected]>
> To: [email protected]
> Subject: [igraph] igraph_haplotype network_vertex.shape =
> "pie"_problem
> Message-ID:
>
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> >
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