Examples of org.apache.pig.piggybank.evaluation.math.ATAN

org.apache.pig.piggybank.evaluation.math.ATAN

math.ATAN implements a binding to the Java function {@link java.lang.Math#atan(double) Math.atan(double)} for computing thearc tangent of value of the argument. The returned value will be a double which is the arc tangent of the value of input.

Parameters:: value - DataAtom [double].
Return Value:: DataAtom [double] arc tangent of the value of input
Return Schema:: atan_inputSchema
Example:: register math.jar; A = load 'mydata' using PigStorage() as ( float1 ); B = foreach A generate float1, math.ATAN(float1);

@see Math#atan(double) @see @author ajay garg

          double actual = (new Double(output.strval())).doubleValue();
          assertEquals(actual, expected, delta);
      }
   
   public void testATAN() throws Exception {
          EvalFunc<DataAtom> ATAN = new ATAN();
          Tuple tup = new Tuple(1);
          tup.setField(0, 0.5);
          DataAtom output = new DataAtom();
          ATAN.exec(tup, output);
          double expected = Math.atan(0.5);
          double actual = (new Double(output.strval())).doubleValue();
          assertEquals(actual, expected, delta);
      }

Examples of org.apache.pig.piggybank.evaluation.math.ATAN

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