/** calculates the mean of the given numeric column */
private void calcMean() {
ArffSortedTableModel model;
int i;
double mean;
// no column selected?
if (m_CurrentCol == -1) return;
model = (ArffSortedTableModel) m_TableArff.getModel();
// not numeric?
if (!model.getAttributeAt(m_CurrentCol).isNumeric()) return;
mean = 0;
for (i = 0; i < model.getRowCount(); i++)
mean += model.getInstances().instance(i).value(m_CurrentCol - 1);
mean = mean / model.getRowCount();
// show result
ComponentHelper.showMessageBox(
getParent(),
"Mean for attribute...",
"Mean for attribute '"
+ m_TableArff.getPlainColumnName(m_CurrentCol)
+ "':\n\t"
+ Utils.doubleToString(mean, 3),
JOptionPane.OK_CANCEL_OPTION,
JOptionPane.PLAIN_MESSAGE);
}
