Examples with Column tech.tablesaw.columns.Column used on opensource projects

Example 1 with Column

use of tech.tablesaw.columns.Column in project symja_android_library by axkr.

the class ASTDataset method newAssociationOfAssociations.

/**
 * Create a <code>Dataset</code> object from a (head-)association <code>&lt;|...|&gt;</code> of
 * (sub-)associations. Each key in the (head-)association is used in the first column the
 * (sub-)association represents the other columns of a row in the <code>Dataset</code>. The
 * left-hand-side of each singular rule in a (sub-)association was assumed to be the name of the
 * resulting <code>Dataset</code> columns. Identical names maps the right-hand-side values of the
 * rule to the same columns in the resulting dataset.
 *
 * @param assocOfAssociations
 * @return {@link F#NIL} if the <code>Dataset</code> cannot be created
 */
public static IExpr newAssociationOfAssociations(IAssociation assocOfAssociations) {
    // 1. phase: build up column names; reserve 1 column for header assoc
    List<String> colNames = new ArrayList<String>();
    Set<String> colNamesSet = new HashSet<String>();
    colNamesSet.add("");
    colNames.add("");
    for (int i = 1; i < assocOfAssociations.size(); i++) {
        IAssociation assoc = (IAssociation) assocOfAssociations.get(i);
        for (int j = 1; j < assoc.size(); j++) {
            IAST rule = assoc.getRule(j);
            String columnName = rule.first().toString();
            if (!colNamesSet.contains(columnName)) {
                colNamesSet.add(columnName);
                colNames.add(columnName);
            }
        }
    }
    if (colNames.size() > 0) {
        // 2. phase: define the columns
        Table table = Table.create();
        Column<?>[] cols = new Column<?>[colNames.size()];
        for (int i = 0; i < colNames.size(); i++) {
            cols[i] = ExprColumn.create(colNames.get(i));
        }
        table.addColumns(cols);
        // 3. phase: add the values
        for (int i = 1; i < assocOfAssociations.size(); i++) {
            IExpr rule = assocOfAssociations.getRule(i);
            IAssociation assoc = (IAssociation) rule.second();
            Row row = table.appendRow();
            row.setExpr("", rule.first());
            for (int j = 1; j < assoc.size(); j++) {
                rule = assoc.getRule(j);
                String columnName = rule.first().toString();
                IExpr value = rule.second();
                row.setExpr(columnName, value);
            }
        }
        return newTablesawTable(table);
    }
    return F.NIL;
}

Example 2 with Column

use of tech.tablesaw.columns.Column in project symja_android_library by axkr.

the class ArgumentList method createEmptyDestinationColumns.

/**
 * @return an ordered list of new columns this analytic query will generate.
 */
List<Column<?>> createEmptyDestinationColumns(int rowCount) {
    List<Column<?>> newColumns = new ArrayList<>();
    for (String toColumn : newColumnNames) {
        FunctionCall<? extends FunctionMetaData> functionCall = Stream.of(aggregateFunctions.get(toColumn), numberingFunctions.get(toColumn)).filter(java.util.Objects::nonNull).findFirst().get();
        ColumnType type = functionCall.function.returnType();
        Column<?> resultColumn = type.create(toColumn);
        newColumns.add(resultColumn);
        for (int i = 0; i < rowCount; i++) {
            resultColumn.appendMissing();
        }
    }
    return newColumns;
}

Example 3 with Column

use of tech.tablesaw.columns.Column in project symja_android_library by axkr.

the class Table method append.

@SuppressWarnings({ "rawtypes", "unchecked" })
public Table append(Table tableToAppend) {
    for (final Column column : columnList) {
        final Column columnToAppend = tableToAppend.column(column.name());
        column.append(columnToAppend);
    }
    return this;
}

Example 4 with Column

use of tech.tablesaw.columns.Column in project symja_android_library by axkr.

the class Rows method copyRowsToTable.

/**
 * Copies the rows indicated by the row index values in the given array from oldTable to newTable
 */
@SuppressWarnings({ "rawtypes", "unchecked" })
public static void copyRowsToTable(int[] rows, Table oldTable, Table newTable) {
    for (int columnIndex = 0; columnIndex < oldTable.columnCount(); columnIndex++) {
        Column oldColumn = oldTable.column(columnIndex);
        int r = 0;
        for (int i : rows) {
            newTable.column(columnIndex).set(r, oldColumn, i);
            r++;
        }
    }
}

Example 5 with Column

use of tech.tablesaw.columns.Column in project symja_android_library by axkr.

the class Rows method copyRowsToTable.

/**
 * Copies the rows indicated by the row index values in the given selection from oldTable to
 * newTable
 */
@SuppressWarnings({ "rawtypes", "unchecked" })
public static void copyRowsToTable(Selection rows, Table oldTable, Table newTable) {
    for (int columnIndex = 0; columnIndex < oldTable.columnCount(); columnIndex++) {
        Column oldColumn = oldTable.column(columnIndex);
        int r = 0;
        for (int i : rows) {
            newTable.column(columnIndex).set(r, oldColumn, i);
            r++;
        }
    }
}