--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/java-genomics-toolkit/src/edu/unc/genomics/visualization/KMeansRow.java	Mon Feb 13 21:55:55 2012 -0500
@@ -0,0 +1,110 @@
+package edu.unc.genomics.visualization;
+
+import java.io.Serializable;
+import java.util.Collection;
+
+import org.apache.commons.math.stat.clustering.Clusterable;
+
+/**
+ * @author timpalpant
+ * Holds a row of data for the KMeans program
+ */
+class KMeansRow implements Clusterable<KMeansRow>, Serializable {
+
+	private static final long serialVersionUID = -323598431692368500L;
+	
+	private final String id;
+	/** Point coordinates. */
+  private final float[] point;
+
+	/**
+   * Build an instance wrapping an float array.
+   * <p>The wrapped array is referenced, it is <em>not</em> copied.</p>
+   * @param point the n-dimensional point in integer space
+   */
+	public KMeansRow(final String id, final float[] point) {
+		this.point = point;
+		this.id = id;
+	}
+
+  /**
+   * Get the n-dimensional point in float space.
+   * @return a reference (not a copy!) to the wrapped array
+   */
+  public float[] getPoint() {
+      return point;
+  }
+
+  /** {@inheritDoc} */
+  public double distanceFrom(final KMeansRow p) {
+  		double sumSquares = 0;
+  		float[] otherPoint = p.getPoint();
+  		for (int i = 0; i < point.length; i++) {
+  			sumSquares += Math.pow(point[i]-otherPoint[i], 2);
+  		}
+      return Math.sqrt(sumSquares);
+  }
+
+  /** {@inheritDoc} */
+  public KMeansRow centroidOf(final Collection<KMeansRow> points) {
+      float[] centroid = new float[getPoint().length];
+      for (KMeansRow p : points) {
+          for (int i = 0; i < centroid.length; i++) {
+              centroid[i] += p.getPoint()[i];
+          }
+      }
+      for (int i = 0; i < centroid.length; i++) {
+          centroid[i] /= points.size();
+      }
+      return new KMeansRow(id, centroid);
+  }
+
+  /** {@inheritDoc} */
+  @Override
+  public boolean equals(final Object other) {
+      if (!(other instanceof KMeansRow)) {
+          return false;
+      }
+      final float[] otherPoint = ((KMeansRow) other).getPoint();
+      if (point.length != otherPoint.length) {
+          return false;
+      }
+      for (int i = 0; i < point.length; i++) {
+          if (point[i] != otherPoint[i]) {
+              return false;
+          }
+      }
+      return true;
+  }
+
+  /** {@inheritDoc} */
+  @Override
+  public int hashCode() {
+      int hashCode = 0;
+      for (Float i : point) {
+          hashCode += i.hashCode() * 13 + 7;
+      }
+      return hashCode;
+  }
+
+  /**
+   * {@inheritDoc}
+   * @since 2.1
+   */
+  @Override
+  public String toString() {
+      final StringBuilder buff = new StringBuilder(id);
+      for (float value : getPoint()) {
+      	buff.append("\t").append(value);
+      }
+      return buff.toString();
+  }
+
+	/**
+	 * @return the id
+	 */
+	public String getId() {
+		return id;
+	}
+
+}