/**
  * Merges the specified date/value point into this builder.
  *
  * <p>The operator is invoked if the date already exists.
  *
  * @param date the date to be added
  * @param value the value associated with the date
  * @param operator the operator to use for merging
  * @return this builder
  */
 public LocalDateDoubleTimeSeriesBuilder merge(
     LocalDate date, double value, DoubleBinaryOperator operator) {
   ArgChecker.notNull(date, "date");
   ArgChecker.notNull(operator, "operator");
   entries.merge(date, value, (a, b) -> operator.applyAsDouble(a, b));
   return this;
 }
예제 #2
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 /**
  * Reduces this matrix returning a single value.
  *
  * <p>This is used to reduce the values in this matrix to a single value. The operator is called
  * once for each element in the matrix. The first argument to the operator is the running total of
  * the reduction, starting from zero. The second argument to the operator is the element.
  *
  * <p>This instance is immutable and unaffected by this method.
  *
  * @param identity the identity value to start from
  * @param operator the operator used to combine the value with the current total
  * @return the result of the reduction
  */
 public double reduce(double identity, DoubleBinaryOperator operator) {
   double result = identity;
   for (int i = 0; i < rows; i++) {
     for (int j = 0; j < columns; j++) {
       result = operator.applyAsDouble(result, array[i][j]);
     }
   }
   return result;
 }
예제 #3
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 /**
  * Returns an instance where each element is formed by some combination of the matching values in
  * this matrix and the other matrix.
  *
  * <p>This is used to combine two matrices, returning a new matrix. Element {@code (i,j)} in the
  * resulting matrix is equal to the result of the operator when applied to element {@code (i,j)}
  * in this array and element {@code (i,j)} in the other array. The arrays must be of the same
  * size.
  *
  * <p>This instance is immutable and unaffected by this method.
  *
  * @param other the other matrix
  * @param operator the operator used to combine each pair of values
  * @return a copy of this matrix combined with the specified matrix
  * @throws IllegalArgumentException if the matrices have different sizes
  */
 public DoubleMatrix combine(DoubleMatrix other, DoubleBinaryOperator operator) {
   if (rows != other.rows || columns != other.columns) {
     throw new IllegalArgumentException("Arrays have different sizes");
   }
   double[][] result = new double[rows][columns];
   for (int i = 0; i < rows; i++) {
     for (int j = 0; j < columns; j++) {
       result[i][j] = operator.applyAsDouble(array[i][j], other.array[i][j]);
     }
   }
   return new DoubleMatrix(result, rows, columns);
 }
 /**
  * Merges the specified date/value point into this builder.
  *
  * <p>The operator is invoked if the date already exists.
  *
  * @param point the point to be added
  * @param operator the operator to use for merging
  * @return this builder
  */
 public LocalDateDoubleTimeSeriesBuilder merge(
     LocalDateDoublePoint point, DoubleBinaryOperator operator) {
   ArgChecker.notNull(point, "point");
   entries.merge(point.getDate(), point.getValue(), (a, b) -> operator.applyAsDouble(a, b));
   return this;
 }