return row;
}
- @Override
- public double getMaxValue()
+ /**
+ * 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 0;
+ 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 max;
+ return empty ? null : new double[] { min, max };
}
+ /**
+ * {@inheritDoc}
+ */
@Override
- public void subtractAllFrom(double val)
+ 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)
{
int j = 0;
for (double x : row)
{
- row[j] = val - x;
+ 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;
+ }
+ }
+ }
+ }
}