Examples of org.apache.commons.math.fraction.BigFraction

Package org.apache.commons.math.fraction

Examples of org.apache.commons.math.fraction.BigFraction

org.apache.commons.math.fraction.BigFraction
Representation of a rational number without any overflow. This class is immutable. @version $Revision: 1073687 $ $Date: 2011-02-23 11:39:25 +0100 (mer. 23 févr. 2011) $ @since 2.0

        }
    }


    public void testBigFractionConverter() {
        BigFraction[][] bfData = {
                { new BigFraction(1), new BigFraction(2), new BigFraction(3) },
                { new BigFraction(2), new BigFraction(5), new BigFraction(3) },
                { new BigFraction(1), new BigFraction(0), new BigFraction(8) }
        };
        FieldMatrix<BigFraction> m = new Array2DRowFieldMatrix<BigFraction>(bfData, false);
        RealMatrix converted = MatrixUtils.bigFractionMatrixToRealMatrix(m);
        RealMatrix reference = new Array2DRowRealMatrix(testData, false);
        assertEquals(0.0, converted.subtract(reference).getNorm(), 0.0);

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            // build the P matrix elements from Taylor series formulas
            final BigFraction[] pI = pData[i];
            final int factor = -(i + 1);
            int aj = factor;
            for (int j = 0; j < pI.length; ++j) {
                pI[j] = new BigFraction(aj * (j + 2));
                aj *= factor;
            }
        }


        return new Array2DRowFieldMatrix<BigFraction>(pData, false);

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            /** {@inheritDoc} */
            public BigFraction[] generate(int k) {
                return new BigFraction[] {
                        BigFraction.ZERO,
                        BigFraction.TWO,
                        new BigFraction(2 * k)};
            }
        });
    }

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                new RecurrenceCoefficientsGenerator() {
            /** {@inheritDoc} */
            public BigFraction[] generate(int k) {
                final int kP1 = k + 1;
                return new BigFraction[] {
                        new BigFraction(2 * k + 1, kP1),
                        new BigFraction(-1, kP1),
                        new BigFraction(k, kP1)};
            }
        });
    }

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            /** {@inheritDoc} */
            public BigFraction[] generate(int k) {
                final int kP1 = k + 1;
                return new BigFraction[] {
                        BigFraction.ZERO,
                        new BigFraction(k + kP1, kP1),
                        new BigFraction(k, kP1)};
            }
        });
    }

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            startK += k;


            // Pk+1(X) = (a[0] + a[1] X) Pk(X) - a[2] Pk-1(X)
            BigFraction[] ai = generator.generate(k);


            BigFraction ck     = coefficients.get(startK);
            BigFraction ckm1   = coefficients.get(startKm1);


            // degree 0 coefficient
            coefficients.add(ck.multiply(ai[0]).subtract(ckm1.multiply(ai[2])));


            // degree 1 to degree k-1 coefficients
            for (int i = 1; i < k; ++i) {
                final BigFraction ckPrev = ck;
                ck     = coefficients.get(startK + i);
                ckm1   = coefficients.get(startKm1 + i);
                coefficients.add(ck.multiply(ai[0]).add(ckPrev.multiply(ai[1])).subtract(ckm1.multiply(ai[2])));
            }


            // degree k coefficient
            final BigFraction ckPrev = ck;
            ck = coefficients.get(startK + k);
            coefficients.add(ck.multiply(ai[0]).add(ckPrev.multiply(ai[1])));


            // degree k+1 coefficient
            coefficients.add(ck.multiply(ai[1]));


        }

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        }
    }


    public void testBigFractionConverter() {
        BigFraction[][] bfData = {
                { new BigFraction(1), new BigFraction(2), new BigFraction(3) },
                { new BigFraction(2), new BigFraction(5), new BigFraction(3) },
                { new BigFraction(1), new BigFraction(0), new BigFraction(8) }
        };
        FieldMatrix<BigFraction> m = new Array2DRowFieldMatrix<BigFraction>(bfData, false);
        RealMatrix converted = MatrixUtils.bigFractionMatrixToRealMatrix(m);
        RealMatrix reference = new Array2DRowRealMatrix(testData, false);
        assertEquals(0.0, converted.subtract(reference).getNorm(), 0.0);

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        }
    }


    public void testBigFractionConverter() {
        BigFraction[][] bfData = {
                { new BigFraction(1), new BigFraction(2), new BigFraction(3) },
                { new BigFraction(2), new BigFraction(5), new BigFraction(3) },
                { new BigFraction(1), new BigFraction(0), new BigFraction(8) }
        };
        FieldMatrix<BigFraction> m = new Array2DRowFieldMatrix<BigFraction>(bfData, false);
        RealMatrix converted = MatrixUtils.bigFractionMatrixToRealMatrix(m);
        RealMatrix reference = new Array2DRowRealMatrix(testData, false);
        assertEquals(0.0, converted.subtract(reference).getNorm(), 0.0);

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            // build the P matrix elements from Taylor series formulas
            final BigFraction[] pI = pData[i];
            final int factor = -(i + 1);
            int aj = factor;
            for (int j = 0; j < pI.length; ++j) {
                pI[j] = new BigFraction(aj * (j + 2));
                aj *= factor;
            }
        }


        return new Array2DRowFieldMatrix<BigFraction>(pData, false);

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            /** {@inheritDoc} */
            public BigFraction[] generate(int k) {
                return new BigFraction[] {
                        BigFraction.ZERO,
                        BigFraction.TWO,
                        new BigFraction(2 * k)};
            }
        });
    }

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