weka.core.Instances.deleteAttributeAt()方法的使用及代码示例

x33g5p2x  于2022-01-21 转载在 其他  
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本文整理了Java中weka.core.Instances.deleteAttributeAt()方法的一些代码示例，展示了Instances.deleteAttributeAt()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Instances.deleteAttributeAt()方法的具体详情如下：
包路径：weka.core.Instances
类名称：Instances
方法名：deleteAttributeAt

Instances.deleteAttributeAt介绍

[英]Deletes an attribute at the given position (0 to numAttributes() - 1). Attribute objects after the deletion point are copied so that their indices can be decremented. Creates a fresh list to hold the old and new attribute objects.
[中]删除给定位置处的属性（0到numAttributes（）-1）。复制删除点后的属性对象，以便减少其索引。创建新列表以保存旧属性对象和新属性对象。

代码示例

代码示例来源：origin: com.googlecode.obvious/obviousx-weka

@Override
public void deleteAttributeAt(int arg0) {
 super.deleteAttributeAt(arg0);
}

代码示例来源：origin: Waikato/meka

/**
 * Delete attributes from a dataset 'D' indexed by 'indicesToRemove[]'.
 * @param    D                    dataset
 * @param    indicesToRemove      array of attribute indices
 * @return    the modified dataset
 */
public static final Instances deleteAttributesAt(Instances D, int indicesToRemove[]) {//, boolean keep) {
  Arrays.sort(indicesToRemove);
  for(int j = indicesToRemove.length-1; j >= 0; j--) {
    D.deleteAttributeAt(indicesToRemove[j]);
  }
  return D;
}

代码示例来源：origin: net.sf.meka/meka

/**
 * Delete attributes from a dataset 'D' indexed by 'indicesToRemove[]'.
 * @param    D                    dataset
 * @param    indicesToRemove      array of attribute indices
 * @return    the modified dataset
 */
public static final Instances deleteAttributesAt(Instances D, int indicesToRemove[]) {//, boolean keep) {
  Arrays.sort(indicesToRemove);
  for(int j = indicesToRemove.length-1; j >= 0; j--) {
    D.deleteAttributeAt(indicesToRemove[j]);
  }
  return D;
}

代码示例来源：origin: nz.ac.waikato.cms.weka/meka

public static final Instances deleteAttributesAt(Instances D, int indicesToRemove[]) {//, boolean keep) {
  Utils.sort(indicesToRemove);
  for(int j = indicesToRemove.length-1; j >= 0; j--) {
    D.deleteAttributeAt(indicesToRemove[j]);
  }
  return D;
}

代码示例来源：origin: Waikato/meka

@Override
public Instances determineOutputFormat(Instances D) throws Exception {
  //System.out.println("DETERMINE OUTPUT FORMAT = "+D.numInstances());
  Instances D_out = new Instances(D,0);
  int L = D.classIndex();
  for(int i = 0; i < L-indices.length; i++) {
    D_out.deleteAttributeAt(0);
  }
  return D_out;
}

代码示例来源：origin: net.sf.meka/meka

@Override
public Instances determineOutputFormat(Instances D) throws Exception {
  //System.out.println("DETERMINE OUTPUT FORMAT = "+D.numInstances());
  Instances D_out = new Instances(D,0);
  int L = D.classIndex();
  for(int i = 0; i < L-indices.length; i++) {
    D_out.deleteAttributeAt(0);
  }
  return D_out;
}

代码示例来源：origin: net.sf.meka/meka

/**
 * ReplaceZasClasses - data Z[][] will be the new class labels in D.
 * @param    D     dataset (of N instances)
 * @param    Z    attribute space (of N rows, H columns)
 * @param    L    column to add Z from in D
 */
public static Instances replaceZasClasses(Instances D, double Z[][], int L) {
  D.setClassIndex(-1);
  for(int j = 0; j < L; j++) {
    D.deleteAttributeAt(0);
  }
  return insertZintoD(D, Z);
}

代码示例来源：origin: Waikato/meka

/**
 * ReplaceZasClasses - data Z[][] will be the new class labels in D.
 * @param    D     dataset (of N instances)
 * @param    Z    attribute space (of N rows, H columns)
 * @param    L    column to add Z from in D
 */
public static Instances replaceZasClasses(Instances D, double Z[][], int L) {
  D.setClassIndex(-1);
  for(int j = 0; j < L; j++) {
    D.deleteAttributeAt(0);
  }
  return insertZintoD(D, Z);
}

代码示例来源：origin: net.sf.meka/meka

/**
 * ReplaceZasAttributes - data Z[][] will be the new attributes in D.
 * @param    D     dataset (of N instances)
 * @param    Z    attribute space (of N rows, H columns)
 * @param    L    number of classes / labels.
 */
public static Instances replaceZasAttributes(Instances D, double Z[][], int L) {
  D.setClassIndex(0);
  int m = D.numAttributes()-L;
  for(int j = 0; j < m; j++) {
    D.deleteAttributeAt(L);
  }
  return addZtoD(D, Z, L);
}

代码示例来源：origin: Waikato/meka

/**
 * ReplaceZasAttributes - data Z[][] will be the new attributes in D.
 * @param    D     dataset (of N instances)
 * @param    Z    attribute space (of N rows, H columns)
 * @param    L    number of classes / labels.
 */
public static Instances replaceZasAttributes(Instances D, double Z[][], int L) {
  D.setClassIndex(0);
  int m = D.numAttributes()-L;
  for(int j = 0; j < m; j++) {
    D.deleteAttributeAt(L);
  }
  return addZtoD(D, Z, L);
}

代码示例来源：origin: net.sf.meka/meka

protected Instances convert(Instances D, int j, int k) {
  int L = D.classIndex();
  D = new Instances(D);
  D.insertAttributeAt(classAttribute,0);
  D.setClassIndex(0);
  for(int i = 0; i < D.numInstances(); i++) {
    String c = (String)((int)Math.round(D.instance(i).value(j+1))+""+(int)Math.round(D.instance(i).value(k+1)));
    D.instance(i).setClassValue(c);
  }
  for (int i = 0; i < L; i++)
    D.deleteAttributeAt(1);
  m_InstancesTemplate = new Instances(D,0);
  return D;
}

代码示例来源：origin: nz.ac.waikato.cms.weka/meka

protected Instances convert(Instances D, int j, int k) {
  int L = D.classIndex();
  D = new Instances(D);
  D.insertAttributeAt(classAttribute,0);
  D.setClassIndex(0);
  for(int i = 0; i < D.numInstances(); i++) {
    String c = (String)((int)Math.round(D.instance(i).value(j+1))+""+(int)Math.round(D.instance(i).value(k+1)));
    D.instance(i).setClassValue(c);
  }
  for (int i = 0; i < L; i++)
    D.deleteAttributeAt(1);
  m_InstancesTemplate = new Instances(D,0);
  return D;
}

代码示例来源：origin: Waikato/meka

protected Instances convert(Instances D, int j, int k) {
  int L = D.classIndex();
  D = new Instances(D);
  D.insertAttributeAt(classAttribute,0);
  D.setClassIndex(0);
  for(int i = 0; i < D.numInstances(); i++) {
    String c = (String)((int)Math.round(D.instance(i).value(j+1))+""+(int)Math.round(D.instance(i).value(k+1)));
    D.instance(i).setClassValue(c);
  }
  for (int i = 0; i < L; i++)
    D.deleteAttributeAt(1);
  m_InstancesTemplate = new Instances(D,0);
  return D;
}

代码示例来源：origin: nz.ac.waikato.cms.weka/meka

/**
 * SwitchAttributes - Move L label attributes from the beginning to end of attribute space of an Instances. 
 * Necessary because MULAN assumes label attributes are at the end, not the beginning.
 * (the extra time for this process is not counted in the running-time analysis of published work).
 */
public static final Instances switchAttributes(Instances instances, int L) {
  for(int j = 0; j < L; j++) {
    //instances.insertAttributeAt(new Attribute(instances.attribute(0).name()+"-"),instances.numAttributes());
    instances.insertAttributeAt(instances.attribute(0).copy(instances.attribute(0).name()+"-"),instances.numAttributes());
    for(int i = 0; i < instances.numInstances(); i++) {
      instances.instance(i).setValue(instances.numAttributes()-1,instances.instance(i).value(0));
    }
    instances.deleteAttributeAt(0);
  }
  return instances;
}

代码示例来源：origin: Waikato/meka

/**
 * meka2mulan - Move L label attributes from the beginning to end of attribute space of an Instances. 
 * Necessary because MULAN assumes label attributes are at the end, not the beginning.
 * (the extra time for this process is not counted in the running-time analysis of published work).
 */
public static final Instances meka2mulan(Instances D, int L) {
  for(int j = 0; j < L; j++) {
    //D.insertAttributeAt(new Attribute(D.attribute(0).name()+"-"),D.numAttributes());
    D.insertAttributeAt(D.attribute(0).copy(D.attribute(0).name()+"-"),D.numAttributes());
    for(int i = 0; i < D.numInstances(); i++) {
      D.instance(i).setValue(D.numAttributes()-1,D.instance(i).value(0));
    }
    D.deleteAttributeAt(0);
  }
  return D;
}

代码示例来源：origin: nz.ac.waikato.cms.weka/weka-stable

/** Need to remove non-nominal attributes, set class index */
protected void setUp() throws Exception {
 super.setUp();
 // class index
 m_Instances.setClassIndex(1);
 // only nominal attributes
 int i = 0;
 while (i < m_Instances.numAttributes()) {
  if (!m_Instances.attribute(i).isNominal())
   m_Instances.deleteAttributeAt(i);
  else
   i++;
 }
 m_Comparator = new InstanceComparator(true);
}

代码示例来源：origin: Waikato/weka-trunk

/** Need to remove non-nominal attributes, set class index */
protected void setUp() throws Exception {
 super.setUp();
 // class index
 m_Instances.setClassIndex(1);
 
 // remove attributes that are not nominal/numeric
 int i = 0;
 while (i < m_Instances.numAttributes()) {
  if (    !m_Instances.attribute(i).isNominal()
     && !m_Instances.attribute(i).isNumeric() )
   m_Instances.deleteAttributeAt(i);
  else
   i++;
 }
}

代码示例来源：origin: nz.ac.waikato.cms.weka/weka-stable

/** Need to remove non-nominal attributes, set class index */
protected void setUp() throws Exception {
 super.setUp();
 // class index
 m_Instances.setClassIndex(1);
 
 // remove attributes that are not nominal/numeric
 int i = 0;
 while (i < m_Instances.numAttributes()) {
  if (    !m_Instances.attribute(i).isNominal()
     && !m_Instances.attribute(i).isNumeric() )
   m_Instances.deleteAttributeAt(i);
  else
   i++;
 }
}

代码示例来源：origin: Waikato/weka-trunk

/** Need to remove attributes that are not nominal/numeric */
protected void setUp() throws Exception {
 super.setUp();
 
 // remove attributes that are not nominal/numeric
 int i = 0;
 while (i < m_Instances.numAttributes()) {
  if (   (    !m_Instances.attribute(i).isNominal()
       && !m_Instances.attribute(i).isNumeric() )
     || m_Instances.attribute(i).isDate() )
   m_Instances.deleteAttributeAt(i);
  else
   i++;
 }
}

代码示例来源：origin: nz.ac.waikato.cms.weka/weka-stable

/** Need to remove attributes that are not nominal/numeric */
protected void setUp() throws Exception {
 super.setUp();
 
 // remove attributes that are not nominal/numeric
 int i = 0;
 while (i < m_Instances.numAttributes()) {
  if (   (    !m_Instances.attribute(i).isNominal()
       && !m_Instances.attribute(i).isNumeric() )
     || m_Instances.attribute(i).isDate() )
   m_Instances.deleteAttributeAt(i);
  else
   i++;
 }
}

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