Package weka.core

Examples of weka.core.Instance.numAttributes()

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               inst.isMissing(inst.numAttributes() - 1));
      } else {
        assertEquals("Instance " + (i + 1),
                     (inst.value(3) + inst.value(2)) *
                     ((inst.value(1) - inst.value(0))/5),
                     inst.value(inst.numAttributes() - 1), EXPR_DELTA);
      }
    }
  }

  public void testBODMAS() {
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    for (int i = 0; i < result.numInstances(); i++) {
      Instance inst = result.instance(i);
      if (inst.isMissing(0) || inst.isMissing(1) ||
          inst.isMissing(2) || inst.isMissing(3)) {
        assertTrue("Instance " + (i + 1) + " should have been ?" ,
               inst.isMissing(inst.numAttributes() - 1));
      } else {
        assertEquals("Instance " + (i + 1),
                     inst.value(2) +
                     (inst.value(3) * inst.value(1))
                     - (inst.value(0)/5)
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                     inst.value(2) +
                     (inst.value(3) * inst.value(1))
                     - (inst.value(0)/5)
                     + (inst.value(3) * inst.value(2))
                     + inst.value(1),
                     inst.value(inst.numAttributes() - 1), EXPR_DELTA);
      }
    }
  }

  public void testAddNamed() {
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    Instances result = useFilter();
    for (int i = 0; i < result.numInstances(); i++) {
      Instance inst = result.instance(i);
      assertEquals("Instance " + (i + 1),
                   inst.value(0) + inst.value(1),
                   inst.value(inst.numAttributes() - 1), EXPR_DELTA);
    }
  }

  public void testSubtract() {
    m_Filter = getFilter("a1-a2");
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    Instances result = useFilter();
    for (int i = 0; i < result.numInstances(); i++) {
      Instance inst = result.instance(i);
      assertEquals("Instance " + (i + 1),
                   inst.value(0) - inst.value(1),
                   inst.value(inst.numAttributes() - 1), EXPR_DELTA);
    }
  }

  public void testMultiply() {
    m_Filter = getFilter("a1*a2");
 
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    Instances result = useFilter();
    for (int i = 0; i < result.numInstances(); i++) {
      Instance inst = result.instance(i);
      assertEquals("Instance " + (i + 1),
                   inst.value(0) * inst.value(1),
                   inst.value(inst.numAttributes() - 1), EXPR_DELTA);
    }
  }

  public void testDivide() {
    m_Filter = getFilter("a1/a2");
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    Instances result = useFilter();
    for (int i = 0; i < result.numInstances(); i++) {
      Instance inst = result.instance(i);
      if (inst.value(1) == 0) {
        assertTrue("Instance " + (i + 1) + " should have been ?" ,
               inst.isMissing(inst.numAttributes() - 1));
      } else {
        assertEquals("Instance " + (i + 1),
                     inst.value(0) / inst.value(1),
                     inst.value(inst.numAttributes() - 1), EXPR_DELTA);
      }
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        assertTrue("Instance " + (i + 1) + " should have been ?" ,
               inst.isMissing(inst.numAttributes() - 1));
      } else {
        assertEquals("Instance " + (i + 1),
                     inst.value(0) / inst.value(1),
                     inst.value(inst.numAttributes() - 1), EXPR_DELTA);
      }
    }
  }

  public void testExponent() {
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    Instances result = useFilter();
    for (int i = 0; i < result.numInstances(); i++) {
      Instance inst = result.instance(i);
      assertEquals("Instance " + (i + 1),
                   Math.pow(inst.value(0), inst.value(1)),
                   inst.value(inst.numAttributes() - 1), EXPR_DELTA);
    }
  }

  public void testLog() {
    m_Filter = getFilter("log(a2/5)");
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    for (int i = 0; i < result.numInstances(); i++) {
      Instance inst = result.instance(i);
      if (inst.value(1) != 0) {
        assertEquals("Instance " + (i + 1),
                     Math.log(inst.value(1)/5),
                     inst.value(inst.numAttributes() - 1), EXPR_DELTA);
      }
    }
  }

  public void testCos() {
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