Examples of MathContext

com.ibm.icu.math.MathContext
The MathContext immutable class encapsulates the settings understood by the operator methods of the {@link BigDecimal}class (and potentially other classes). Operator methods are those that effect an operation on a number or a pair of numbers.
The settings, which are not base-dependent, comprise:
1. digits: the number of digits (precision) to be used for an operation
2. form: the form of any exponent that results from the operation
3. lostDigits: whether checking for lost digits is enabled
4. roundingMode: the algorithm to be used for rounding.
When provided, a MathContext object supplies the settings for an operation directly.
When MathContext.DEFAULT is provided for a MathContext parameter then the default settings are used (9, SCIENTIFIC, false, ROUND_HALF_UP).
In the BigDecimal class, all methods which accept a MathContext object defaults) also have a version of the method which does not accept a MathContext parameter. These versions carry out unlimited precision fixed point arithmetic (as though the settings were (0, PLAIN, false, ROUND_HALF_UP).
The instance variables are shared with default access (so they are directly accessible to the BigDecimal class), but must never be changed.
The rounding mode constants have the same names and values as the constants of the same name in java.math.BigDecimal, to maintain compatibility with earlier versions of BigDecimal. @see BigDecimal @author Mike Cowlishaw @stable ICU 2.0
java.math.MathContext
Immutable objects which encapsulate the context settings which describe certain rules for numerical operators, such as those implemented by the {@link BigDecimal} class.
The base-independent settings are:
1. {@code precision}: the number of digits to be used for an operation; results are rounded to this precision
2. {@code roundingMode}: a {@link RoundingMode} object which specifies the algorithm to beused for rounding.
@see BigDecimal @see RoundingMode @author Mike Cowlishaw @author Joseph D. Darcy @since 1.5

Examples of java.math.MathContext

  System.out.println(b3.scale());      // 101
  System.out.println(b3.signum());     // -1


  // RoundingMode.DOWN always goes towards 0
  // b3.precision() - b3.scale() will be the number of digits in the integer part of the BigDecimal
  MathContext mc = new MathContext(b3.precision() - b3.scale(), RoundingMode.DOWN); 
  BigDecimal b3ROUNDED = b3.round(mc);
  BigDecimal b3FRACTIONALPART = b3.subtract(b3ROUNDED);
  
  System.out.println(b3ROUNDED);       // -22222222222222222222222222222222222222222222222222222222222222222222222
  System.out.println(b3FRACTIONALPART); // -0.33333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333

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Examples of java.math.MathContext


            int kmax = Math.min(i,j);
            BigDecimal s = BigDecimal.ZERO;
            for (int k = 0; k < kmax; k++) {
                int scale = MatrixBigDecimal.GLOBAL_SCALE;
                s = s.add(LUrowi[k].multiply(LUcolj[k], new MathContext(scale)));
            }


            LUcolj[i] = LUcolj[i].subtract(s);
            LUrowi[j] = LUcolj[i];
         }

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Examples of java.math.MathContext

         throw new IllegalArgumentException("Matrix must be square.");
      }
      BigDecimal d = new BigDecimal(pivsign);
      for (int j = 0; j < n; j++) {
          int scale = MatrixBigDecimal.GLOBAL_SCALE;
          d = d.multiply(LU[j][j], new MathContext(scale));
      }
      return d;
   }

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Examples of java.math.MathContext

      // Solve L*Y = B(piv,:)
      for (int k = 0; k < n; k++) {
         for (int i = k+1; i < n; i++) {
            for (int j = 0; j < nx; j++) {
                int scale = MatrixBigDecimal.GLOBAL_SCALE;
                X[i][j] = X[i][j].subtract(X[k][j].multiply(LU[i][k], new MathContext(scale)));
            }
         }
      }
      // Solve U*X = Y;
      for (int k = n-1; k >= 0; k--) {
         for (int j = 0; j < nx; j++) {
             int scale = MatrixBigDecimal.GLOBAL_SCALE;
            X[k][j] = X[k][j].divide(LU[k][k], scale, roundingMode);
         }
         for (int i = 0; i < k; i++) {
            for (int j = 0; j < nx; j++) {
                int scale = MatrixBigDecimal.GLOBAL_SCALE;
                X[i][j] = X[i][j].subtract(X[k][j].multiply(LU[i][k], new MathContext(scale)));
            }
         }
      }
      return Xmat;
   }

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Examples of java.math.MathContext

   public static BigDecimal hypot(BigDecimal a, BigDecimal b, int roundingMode) {
       BigDecimal r;
      if (a.abs().compareTo(b.abs()) > 0) {
          int scale = MatrixBigDecimal.GLOBAL_SCALE;
         r = b.divide(a, scale);
         r = a.abs().multiply(sqrt(r.multiply(r, new MathContext(scale)).add(BigDecimal.ONE), scale, roundingMode), new MathContext(scale));
      } else if (b.compareTo(BigDecimal.ZERO) != 0) {
          int scale = MatrixBigDecimal.GLOBAL_SCALE;
         r = a.divide(b, scale);
         r = b.abs().multiply(sqrt(r.multiply(r, new MathContext(scale)).add(BigDecimal.ONE), scale, roundingMode), new MathContext(scale));
      } else {
         r = BigDecimal.ZERO;
      }
      return r;
   }

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Examples of java.math.MathContext

            // Apply transformation to remaining columns.
            for (int j = k+1; j < n; j++) {
               BigDecimal s = BigDecimal.ZERO; 
               for (int i = k; i < m; i++) {
                   int scale = MatrixBigDecimal.GLOBAL_SCALE;
                   s = s.add(QR[i][k].multiply(QR[i][j], new MathContext(scale)));
               }
               int scale = MatrixBigDecimal.GLOBAL_SCALE;
               s = s.negate().divide(QR[k][k], scale, roundingMode);
               for (int i = k; i < m; i++) {
                   int scale2 = MatrixBigDecimal.GLOBAL_SCALE;
                   QR[i][j] = QR[i][j].add(s.multiply(QR[i][k], new MathContext(scale2)));
               }
            }
         }
         Rdiag[k] = nrm.negate();
      }

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Examples of java.math.MathContext

      for (int k = 0; k < n; k++) {
         for (int j = 0; j < nx; j++) {
            BigDecimal s = BigDecimal.ZERO; 
            for (int i = k; i < m; i++) {
                int scale = MatrixBigDecimal.GLOBAL_SCALE;
                s = s.add(QR[i][k].multiply(X[i][j]), new MathContext(scale));
            }
            int scale = Math.max(s.scale(), QR[k][k].scale());
            s = s.negate().divide(QR[k][k], scale, roundingMode);
            for (int i = k; i < m; i++) {
                int scale2 = MatrixBigDecimal.GLOBAL_SCALE;
                X[i][j] = X[i][j].add(s.multiply(QR[i][k], new MathContext(scale2)));
            }
         }
      }
      // Solve R*X = Y;
      for (int k = n-1; k >= 0; k--) {
         for (int j = 0; j < nx; j++) {
             int scale = MatrixBigDecimal.GLOBAL_SCALE;
             X[k][j] = X[k][j].divide(Rdiag[k], scale, roundingMode);
         }
         for (int i = 0; i < k; i++) {
            for (int j = 0; j < nx; j++) {
                int scale = MatrixBigDecimal.GLOBAL_SCALE;
                X[i][j] = X[i][j].subtract(X[k][j].multiply(QR[i][k], new MathContext(scale)));
            }
         }
      }
      return (new JamaMatrixBigDecimal(X,n,nx).getMatrix(0,n-1,0,nx-1));
   }

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Examples of java.math.MathContext

            return this;
        }
        
        for (int i = 0; i < this.matrix.length; i++) {
            for (int j = 0; j < this.matrix[0].length; j++) {
                this.matrix[i][j].round(new MathContext(digits));
            }
        }
        
        return this;
    }

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Examples of java.math.MathContext

            for (int j = 0; j < other.getRowCount(); j++) {
                for (int k = 0; k < this.getRowCount(); k++) {
                    if (c[i][j] == null) {
                        c[i][j] = BigDecimal.ZERO;
                    }
                    c[i][j] = c[i][j].add(this.get(i, k).multiply(other.get(k, j), new MathContext(GLOBAL_SCALE)));
                }
            }
        }


        this.matrix = c;

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Examples of java.math.MathContext

                precision--;
                formatToken.setPrecision(precision);
                transform_e();
                return;
            }
            BigDecimal b = new BigDecimal(d, new MathContext(precision));
            d = b.doubleValue();
            long l = b.longValue();


            if (d >= 1 && d < Math.pow(10, precision)) {
                if (l < Math.pow(10, precision)) {

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