queries/RMAT.mrql

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// Kronecker graph generator parameters:
a = 0.30;
b = 0.25;
c = 0.25;
d = 1-(a+b+c);

function randomEdge ( imin: int, imax: int, jmin: int, jmax: int ): (int,int) {
   if (imin = imax and jmin = jmax)
   then (imin,jmin)
   else let n = random(1000)
        in if (n as float <= 1000*a)
           then randomEdge(imin,(imin+imax)/2,jmin,(jmin+jmax)/2)
           else if (n as float <= 1000*(a+b))
                then randomEdge((imin+imax)/2,imax,jmin,(jmin+jmax)/2)
                else if (n as float <= 1000*(a+b+c))
                     then randomEdge(imin,(imin+imax)/2,(jmin+jmax)/2,jmax)
                     else randomEdge((imin+imax)/2,imax,(jmin+jmax)/2,jmax)
};

store "tmp/graph.bin"
 from select distinct randomEdge(0,toInt(args[0]),0,toInt(args[0]))
        from i in 1...(toLong(args[1]));