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Re: [igraph] igraph-help Digest, Vol 95, Issue 6
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From: |
Gábor Csárdi |
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Subject: |
Re: [igraph] igraph-help Digest, Vol 95, Issue 6 |
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Date: |
Mon, 9 Jun 2014 09:06:52 -0400 |
Hi,
you pass minx, maxx, miny and maxy and they contain zeros, so you
restrict the layout to [0,0] x [0,0]. Pass a null pointer for these
arguments if you don't want to restrict the coordinates.
You are also passing in a fully zero weight matrix, you probably want
to use a null pointer here as well.
Btw. you are using an old version of igraph, the latest version of the
C library is 0.7.1.
Gabor
On Mon, Jun 9, 2014 at 7:24 AM, 李甜 <address@hidden> wrote:
> 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 <address@hidden>:
>>
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>> Today's Topics:
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>> 1. Problems about igraph-c library generating layouts for graph (??)
>> 2. Re: Problems about igraph-c library generating layouts for
>> graph (G?bor Cs?rdi)
>> 3. igraph_haplotype network_vertex.shape = "pie"_problem (Axel Hille)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Sat, 7 Jun 2014 23:40:49 +0800
>> From: ?? <address@hidden>
>> To: address@hidden
>> Subject: [igraph] Problems about igraph-c library generating layouts
>> for graph
>> Message-ID:
>>
>> <address@hidden>
>> 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
>> -------------- next part --------------
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>> ------------------------------
>>
>> Message: 2
>> Date: Sat, 7 Jun 2014 12:54:24 -0400
>> From: G?bor Cs?rdi <address@hidden>
>> To: Help for igraph users <address@hidden>
>> Subject: Re: [igraph] Problems about igraph-c library generating
>> layouts for graph
>> Message-ID:
>>
>> <address@hidden>
>> 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, ?? <address@hidden> 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
>> > address@hidden
>> > https://lists.nongnu.org/mailman/listinfo/igraph-help
>> >
>>
>>
>>
>> ------------------------------
>>
>> Message: 3
>> Date: Sat, 7 Jun 2014 22:53:45 +0200
>> From: "Axel Hille" <address@hidden>
>> To: address@hidden
>> Subject: [igraph] igraph_haplotype network_vertex.shape =
>> "pie"_problem
>> Message-ID:
>>
>> <address@hidden>
>>
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>>
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>> End of igraph-help Digest, Vol 95, Issue 6
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