Examples of org.apache.mahout.math.function.IntFunction

org.apache.mahout.math.function.IntFunction
Interface that represents a function object: a function that takes a single argument and returns a single value.

  private IntFunctions() {
  }


  /** Constructs a function that returns <tt>a & b</tt>. <tt>a</tt> is a variable, <tt>b</tt> is fixed. */
  public static IntFunction and(final int b) {
    return new IntFunction() {


      public int apply(int a) {
        return a & b;
      }
    };

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  /**
   * Constructs a function that returns <tt>(from<=a && a<=to) ? 1 : 0</tt>. <tt>a</tt> is a variable, <tt>from</tt> and
   * <tt>to</tt> are fixed.
   */
  public static IntFunction between(final int from, final int to) {
    return new IntFunction() {


      public int apply(int a) {
        return (from <= a && a <= to) ? 1 : 0;
      }
    };

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   * @param g a unary function.
   * @param h a unary function.
   * @return the unary function <tt>g( h(a) )</tt>.
   */
  public static IntFunction chain(final IntFunction g, final IntFunction h) {
    return new IntFunction() {


      public int apply(int a) {
        return g.apply(h.apply(a));
      }
    };

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  /**
   * Constructs a function that returns <tt>a < b ? -1 : a > b ? 1 : 0</tt>. <tt>a</tt> is a variable, <tt>b</tt> is
   * fixed.
   */
  public static IntFunction compare(final int b) {
    return new IntFunction() {


      public int apply(int a) {
        return a < b ? -1 : a > b ? 1 : 0;
      }
    };

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    };
  }


  /** Constructs a function that returns the constant <tt>c</tt>. */
  public static IntFunction constant(final int c) {
    return new IntFunction() {


      public int apply(int a) {
        return c;
      }
    };

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    };
  }


  /** Constructs a function that returns <tt>a / b</tt>. <tt>a</tt> is a variable, <tt>b</tt> is fixed. */
  public static IntFunction div(final int b) {
    return new IntFunction() {


      public int apply(int a) {
        return a / b;
      }
    };

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    };
  }


  /** Constructs a function that returns <tt>a == b ? 1 : 0</tt>. <tt>a</tt> is a variable, <tt>b</tt> is fixed. */
  public static IntFunction equals(final int b) {
    return new IntFunction() {


      public int apply(int a) {
        return a == b ? 1 : 0;
      }
    };

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    };
  }


  /** Constructs a function that returns <tt>Math.max(a,b)</tt>. <tt>a</tt> is a variable, <tt>b</tt> is fixed. */
  public static IntFunction max(final int b) {
    return new IntFunction() {


      public int apply(int a) {
        return (a >= b) ? a : b;
      }
    };

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    };
  }


  /** Constructs a function that returns <tt>Math.min(a,b)</tt>. <tt>a</tt> is a variable, <tt>b</tt> is fixed. */
  public static IntFunction min(final int b) {
    return new IntFunction() {


      public int apply(int a) {
        return (a <= b) ? a : b;
      }
    };

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    };
  }


  /** Constructs a function that returns <tt>a - b</tt>. <tt>a</tt> is a variable, <tt>b</tt> is fixed. */
  public static IntFunction minus(final int b) {
    return new IntFunction() {


      public int apply(int a) {
        return a - b;
      }
    };

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