X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fmath%2FMatrix.java;h=821fc664a0c3134003248d0aec828d019452bff6;hb=567c2595554096f10feab130153f97286f3f7d80;hp=de0bf77334a5e49847e2b058b812363033150a92;hpb=cf78dc7e8c37a03da8e7e396fec7e7ec54666847;p=jalview.git

diff --git a/src/jalview/math/Matrix.java b/src/jalview/math/Matrix.java
index de0bf77..821fc66 100755
--- a/src/jalview/math/Matrix.java
+++ b/src/jalview/math/Matrix.java
@@ -532,6 +532,7 @@ public class Matrix implements MatrixI
     return value[i][j];
   }
 
+  @Override
   public void setValue(int i, int j, double val)
   {
     value[i][j] = val;
@@ -889,4 +890,90 @@ public class Matrix implements MatrixI
     System.arraycopy(value[i], 0, row, 0, cols);
     return row;
   }
+
+  /**
+   * Returns a length 2 array of {minValue, maxValue} of all values in the
+   * matrix. Returns null if the matrix is null or empty.
+   * 
+   * @return
+   */
+  double[] findMinMax()
+  {
+    if (value == null)
+    {
+      return null;
+    }
+    double min = Double.MAX_VALUE;
+    double max = -Double.MAX_VALUE;
+    boolean empty = true;
+    for (double[] row : value)
+    {
+      if (row != null)
+      {
+        for (double x : row)
+        {
+          empty = false;
+          if (x > max)
+          {
+            max = x;
+          }
+          if (x < min)
+          {
+            min = x;
+          }
+        }
+      }
+    }
+    return empty ? null : new double[] { min, max };
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  @Override
+  public void reverseRange(boolean maxToZero)
+  {
+    if (value == null)
+    {
+      return;
+    }
+    double[] minMax = findMinMax();
+    if (minMax == null)
+    {
+      return; // empty matrix
+    }
+    double subtractFrom = maxToZero ? minMax[1] : minMax[0] + minMax[1];
+
+    for (double[] row : value)
+    {
+      if (row != null)
+      {
+        int j = 0;
+        for (double x : row)
+        {
+          row[j] = subtractFrom - x;
+          j++;
+        }
+      }
+    }
+  }
+
+  /**
+   * Multiply every entry in the matrix by the given value. This method is not
+   * thread-safe.
+   */
+  @Override
+  public void multiply(double d)
+  {
+    for (double[] row : value)
+    {
+      if (row != null)
+      {
+        for (int i = 0; i < row.length; i++)
+        {
+          row[i] *= d;
+        }
+      }
+    }
+  }
 }