Examples of weka.core.AttributeExpression

weka.core.AttributeExpression
A general purpose class for parsing mathematical expressions involving attribute values. Values can be provided in an array or in an Instance. Values are accessed in the expression by prefixing their index (starting at 1) with the character 'a'.
```
 Example expression: a1^2*a5/log(a7*4.0) 
```
Supported opperators: +, -, *, /, ^, log, abs, cos, exp, sqrt, floor, ceil, rint, tan, sin, (, ). @author Mark Hall @version $Revision: 5989 $

   * @return true if the outputFormat may be collected immediately
   * @throws Exception if the format couldn't be set successfully
   */
  public boolean setInputFormat(Instances instanceInfo) throws Exception {


    m_attributeExpression = new AttributeExpression();
    m_attributeExpression.
      convertInfixToPostfix(new String(m_infixExpression));


    super.setInputFormat(instanceInfo);

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    boolean nonDouble = false;


    for (int i = 0; i < m_size; i++) {
      for (int j = 0; j < m_size; j++) {
        if (getCell(i, j) instanceof String) {
          AttributeExpression temp = new AttributeExpression();
          temp.convertInfixToPostfix((String)getCell(i, j));
          setCell(i, j, temp);
          nonDouble = true;
        } else if (getCell(i, j) instanceof AttributeExpression) {
          nonDouble = true;
        }

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   * @return true if the outputFormat may be collected immediately
   * @throws Exception if the format couldn't be set successfully
   */
  public boolean setInputFormat(Instances instanceInfo) throws Exception {


    m_attributeExpression = new AttributeExpression();
    m_attributeExpression.
      convertInfixToPostfix(new String(m_infixExpression));


    super.setInputFormat(instanceInfo);

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    boolean nonDouble = false;


    for (int i = 0; i < m_size; i++) {
      for (int j = 0; j < m_size; j++) {
        if (getCell(i, j) instanceof String) {
          AttributeExpression temp = new AttributeExpression();
          temp.convertInfixToPostfix((String)getCell(i, j));
          setCell(i, j, temp);
          nonDouble = true;
        } else if (getCell(i, j) instanceof AttributeExpression) {
          nonDouble = true;
        }

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   * @return true if the outputFormat may be collected immediately
   * @throws Exception if the format couldn't be set successfully
   */
  public boolean setInputFormat(Instances instanceInfo) throws Exception {


    m_attributeExpression = new AttributeExpression();
    m_attributeExpression.
      convertInfixToPostfix(new String(m_infixExpression));


    super.setInputFormat(instanceInfo);

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