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// For information as to what this class does, see the Javadoc, below.       //
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// Scheines, Joseph Ramsey, and Clark Glymour.                               //
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package edu.cmu.tetrad.study.gene.tetrad.gene.algorithm.util;


/**
 * Represents a graph that's output by a genetic search algorithm.
 *
 * @author josephramsey
 */
public interface OutputGraph {

    /**
     * Returns the number of variables over which the graph is defined.
     */
    int getSize();

    /**
     * Returns the indices of the parent variables for the given variable.
     *
     * @param index the index of the variable whose parents are requested.
     */
    int[] getParents(int index);

    /**
     * Returns the lags of the parent variables for the given variable, provided
     * parents have associated time lags; otherwise, returns null. A lag is a
     * number &gt;= 0, where 0 indicates the getModel time step and integers &gt; 0
     * indicate that many time steps back into the past. If getLags(index) is
     * non-null, the length of getLags(index) should be the same as the length
     * of getParents(index), and getLags(i) should be the lag for the
     * corresponding position in getParents(i), for i = 0,...,
     * getParents(i).length.
     *
     * @param index the lags of the variable whose parents are requested.
     */
    int[] getLags(int index);

    /**
     * Returns the name of the variable at the given index.
     */
    String getNodeName(int index);

    /**
     * Returns the name of the graph
     */
    String getGraphName();

}





