Examples of ptolemy.math.FixPoint

ptolemy.math.FixPoint
The FixPoint class provides a fixed point data type and a set of functions that operate on and return fixed point data. An instance of the class is immutable, meaning that its value is set in the constructor and cannot then be modified. This is similar to the Java built-in classes like Double, Integer, etc.
The FixPoint class represents signed numbers in a two's-complement format or unsigned numbers in a binary format with unlimited dynamic range and a resolution defined by a finite number of fractional bits. The precision is defined by the {@link ptolemy.math.Precision Precision} class.
Because a fixed point data type uses a finite number of bits to represent a value, a real value is converted to a number that can be expressed with a given precision of the fixed point, thereby introducing a quantization error. The overflow and rounding strategies used for this quantization are defined by an instance of the {@link ptolemy.math.Quantization Quantization} class.
The design of the FixPoint class complies with a philosophy that all operators work losslessly, i.e. the fractional precision of the result is determined such there is no loss of precision. To insure lossless operations, the resulting Precision of these operators will expand as necessary. Subsequent results can be quantized as necessary.
Violations of the loss-less philosophy occur during construction, division and conversion to floating point. During construction from floating point values, the nearest fixed point representation is created. The preferred divide operator provides for explicit specification of the quantization. A deprecated divide operator guesses at the result precision. Conversion to floating point is limited by the available floating point accuracy.
The FixPoint implementation uses the Java class BigInteger to represent the finite value and so this implementation is truly platform independent. Note that the FixPoint does not put any restrictions on the maximum number of bits in the representation of a value. @author Bart Kienhuis, Ed Willink, Contributor: Edward A. Lee, Mike Wirthlin @version $Id: FixPoint.java,v 1.84 2007/12/07 06:30:32 cxh Exp $ @since Ptolemy II 0.4, rewritten for Ptolemy II 2.2 @Pt.ProposedRating Red (Ed.Willink) @Pt.AcceptedRating Red @see ptolemy.math.Precision @see ptolemy.math.Quantization


    /** Return the value in the token as a fixpoint.
     *  @return The value contained in this token as a fixpoint.
     */
    public FixPoint fixValue() {
        return new FixPoint(_value);
    }

View Full Code Here

     *  token.
     *  @return A new FixMatrixToken containing the additive identity.
     */
    public Token zero() {
        FixPoint[][] result = new FixPoint[_rowCount][_columnCount];
        FixPoint zero = Quantizer.round(0.0, _precision);


        for (int i = 0; i < _rowCount; i++) {
            for (int j = 0; j < _columnCount; j++) {
                result[i][j] = zero;
            }

View Full Code Here

     *  supported by the derived class.
     *  @return A new Token containing the result.
     */
    protected MatrixToken _addElement(Token rightArgument)
            throws IllegalActionException {
        FixPoint scalar;
        if (rightArgument instanceof FixMatrixToken) {
            if (((FixMatrixToken) rightArgument).getRowCount() != 1
                    || ((FixMatrixToken) rightArgument).getColumnCount() != 1) {
                // Throw an exception.
                return super._moduloElement(rightArgument);

View Full Code Here


        FixPoint[][] result = new FixPoint[_rowCount][convertedArgument._columnCount];


        for (int i = 0; i < _rowCount; i++) {
            for (int j = 0; j < convertedArgument._columnCount; j++) {
                FixPoint sum = _value[i][0]
                        .multiply(convertedArgument._value[0][j]);


                for (int k = 1; k < _columnCount; k++) {
                    sum = sum.add(_value[i][k]
                            .multiply(convertedArgument._value[k][j]));
                }


                result[i][j] = sum;
            }

View Full Code Here

     *  supported by the derived class.
     *  @return A new Token containing the result.
     */
    protected MatrixToken _multiplyElement(Token rightArgument)
            throws IllegalActionException {
        FixPoint scalar;
        if (rightArgument instanceof FixMatrixToken) {
            if (((FixMatrixToken) rightArgument).getRowCount() != 1
                    || ((FixMatrixToken) rightArgument).getColumnCount() != 1) {
                // Throw an exception.
                return super._moduloElement(rightArgument);

View Full Code Here

     *  supported by the derived class.
     *  @return A new Token containing the result.
     */
    protected MatrixToken _subtractElement(Token rightArgument)
            throws IllegalActionException {
        FixPoint scalar;
        if (rightArgument instanceof FixMatrixToken) {
            if (((FixMatrixToken) rightArgument).getRowCount() != 1
                    || ((FixMatrixToken) rightArgument).getColumnCount() != 1) {
                // Throw an exception.
                return super._moduloElement(rightArgument);

View Full Code Here

     *  supported by the derived class.
     *  @return A new Token containing the result.
     */
    protected MatrixToken _subtractElementReverse(Token rightArgument)
            throws IllegalActionException {
        FixPoint scalar;
        if (rightArgument instanceof FixMatrixToken) {
            if (((FixMatrixToken) rightArgument).getRowCount() != 1
                    || ((FixMatrixToken) rightArgument).getColumnCount() != 1) {
                // Throw an exception.
                return super._moduloElement(rightArgument);
            }
            scalar = ((FixMatrixToken) rightArgument).getElementAt(0, 0);
        } else {
            scalar = ((FixToken) rightArgument).fixValue();
        }
        FixPoint[][] result = fixMatrix();


        for (int i = 0; i < _rowCount; i++) {
            for (int j = 0; j < _columnCount; j++) {
                result[i][j] = scalar.subtract(result[i][j]);
            }
        }


        return new FixMatrixToken(result);
    }

View Full Code Here

     *  This method calls the {@link ptolemy.math.FixPoint#FixPoint(int)}
     *  constructor, so the precision and quantization are the what ever
     *  is defined for that constructor
     */
    public FixToken() {
        _value = new FixPoint(0);
    }

View Full Code Here

    public FixToken(double value, Precision precision)
            throws IllegalArgumentException {
        try {
            FixPointQuantization q = new FixPointQuantization(precision,
                    Overflow.SATURATE, Rounding.NEAREST);
            _value = new FixPoint(value, q);
        } catch (NumberFormatException e) {
            throw new IllegalArgumentException(e.getMessage());
        }
    }

View Full Code Here

            throws IllegalArgumentException {
        try {
            Precision precision = new Precision(numberOfBits, integerBits);
            FixPointQuantization q = new FixPointQuantization(precision,
                    Overflow.SATURATE, Rounding.NEAREST);
            _value = new FixPoint(value, q);
        } catch (NumberFormatException e) {
            throw new IllegalArgumentException(e.getMessage());
        }
    }

View Full Code Here

0 1 2 3

TOP

Related Classes of ptolemy.math.FixPoint

ptolemy.actor.lib.conversions.DoubleToFix

ptolemy.actor.lib.conversions.FixToDouble

ptolemy.actor.lib.conversions.FixToFix

ptolemy.actor.lib.vhdl.Concat

ptolemy.actor.lib.vhdl.FixConst

ptolemy.actor.lib.vhdl.FixCounter

ptolemy.actor.lib.vhdl.FixSequence

ptolemy.actor.lib.vhdl.FixToString

ptolemy.actor.lib.vhdl.IntegerCounter

ptolemy.actor.lib.vhdl.LogicalNot

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.