help me with this implementation

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C

I fixed the next code

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>

typedef struct _nodolista{
     int columnindex;
     struct _nodolista*next;
    int value;
}nodol;
typedef struct _nodocabecera{
    int rowindex;
    nodol * next;
    struct _nodocabecera*down;
}nodoc;
typedef struct _matrix{
      nodoc*idlist;/* id   list*/
      nodol*valuelist;/*value row list*/
    }matrix;
/*this function initializes the IDlist*/
    nodoc * iniID(int m){
        nodoc* IDlist;
        int i;
        IDlist=( nodoc*)malloc(m*sizeof( nodoc));

         /*now we create the list of identifiers*/
        for (i=1;i<=m;i++){
            if (i==m){
                        IDlist->rowindex=m;
                        IDlist->next=NULL;
                        IDlist->down=NULL;
            return IDlist;
                        }
            IDlist->rowindex=i;
            IDlist->next=NULL;
            IDlist=IDlist->down;
        }
    return IDlist;
}
matrix * iniM(int m , int n){
    matrix * x;
    int i=1;
    /*we create the disperse matrix*/
            x=(matrix *)malloc(m*n*sizeof(matrix));
            /*we create the idlist*/
            x->idlist=iniID(m);
            /*we create the value list*/
            nodol* valuelist;
            nodoc * aux;
            x->valuelist=NULL;
                for(aux=x->idlist;aux->down!=NULL;aux=aux->down){
                    valuelist=(nodol*)malloc(sizeof(nodol));
                    aux->next=valuelist;
                    valuelist->columnindex=i;
                    for (i=2;i<=n;i++){
                        if (i==n){
                        valuelist=(nodol*)malloc(sizeof(nodol));
                        valuelist->columnindex=n;
                        valuelist->value=0;
                        valuelist->next=NULL;
                        return x ;
                        }
                        valuelist=(nodol*)malloc(sizeof(nodol));
                        valuelist->columnindex=i;
                        valuelist->value=0;
                        valuelist=valuelist->next;
                        } return x;
                }
                return x;
}


int dpmatrix(matrix *x){
        int i,j,val;
        nodoc * aux;
        nodol * aux2;

    for (aux=x->idlist;aux->down!=NULL;aux=aux->down){
            i=aux->rowindex;
            aux->next=x->valuelist;

        for (aux2=aux->next;aux2->next!=NULL;aux2=aux2->next){
                   j=aux2->columnindex;
                    printf("%d,%d introduzca elemento",i,j);
                    scanf("%d",&val);
                    if (val!=0 )
                    aux2->value=val;
                }
        }
return 0;
}


 int main(){
    int i,j;
    matrix * M;
    printf("introduzca el numero de filas \n");
    scanf("%d",&i);
    printf("introduzca el numero de columnas \n");
    scanf("%d",&j);
    M=iniM(i,j);
    dpmatrix(M);
return 0;
 }

, but it's still not compiling yet, when i run the program, it takes the numbers of rows and columns, then the program hangs, and i don't if it's a problem of assignment of memory, cuz' the code doesn't show any errors and the logic of the algorithm is well, please somebody help me with this problem ! ;( thanks in advance