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

Example 16 with Column

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

the class ASTDataset method select.

@Override
public IExpr select(IAST ast) {
    IExpr row = ast.arg1();
    IExpr column = ast.arg2();
    IExpr[] part = new IExpr[ast.size() - 3];
    IExpr result = select(row, column);
    if (part.length == 0) {
        return result;
    }
    if (result.isDataset()) {
        for (int i = 0; i < part.length; i++) {
            part[i] = ast.get(i + 3);
        }
        EvalEngine engine = EvalEngine.get();
        ASTDataset dataset = (ASTDataset) result;
        Table table = dataset.fTable;
        final List<String> names = table.columnNames();
        if (names.size() > 0) {
            Table resultTable = Table.create();
            Column<?>[] cols = new Column<?>[names.size()];
            for (int i = 0; i < names.size(); i++) {
                cols[i] = ExprColumn.create(names.get(i));
            }
            resultTable.addColumns(cols);
            for (int i = 0; i < table.rowCount(); i++) {
                Row currentRow = table.row(i);
                Row resultRow = resultTable.appendRow();
                for (int j = 0; j < table.columnCount(); j++) {
                    String columnName = names.get(j);
                    ColumnType t = currentRow.getColumnType(columnName);
                    IExpr arg = dataToExpr(table.get(i, j), t);
                    IExpr value = S.Part.of1(engine, arg, part);
                    if (value.isAST(S.Part) || !value.isPresent()) {
                        IASTAppendable missing = F.ast(S.Missing);
                        missing.append(F.$str("PartAbsent"));
                        missing.appendAll(part, 0, part.length);
                        value = missing;
                    }
                    resultRow.setExpr(columnName, value);
                }
            }
            return ASTDataset.newTablesawTable(resultTable);
        }
    }
    return F.NIL;
}

Example 17 with Column

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

the class Summarizer method apply.

/**
 * Returns the result of applying to the functions to all the values in the appropriate column
 * TODO add a test that uses a non numeric return type with apply
 */
@SuppressWarnings({ "unchecked", "rawtypes" })
public Table apply() {
    if (groupColumnNames.length > 0) {
        TableSliceGroup group = StandardTableSliceGroup.create(temp, groupColumnNames);
        return summarize(group);
    } else {
        List<Table> results = new ArrayList<>();
        ArrayListMultimap<String, AggregateFunction<?, ?>> reductionMultimap = getAggregateFunctionMultimap();
        for (String name : reductionMultimap.keys()) {
            List<AggregateFunction<?, ?>> reductions = reductionMultimap.get(name);
            Table table = TableSliceGroup.summaryTableName(temp);
            for (AggregateFunction function : reductions) {
                Column column = temp.column(name);
                Object result = function.summarize(column);
                ColumnType type = function.returnType();
                Column newColumn = type.create(TableSliceGroup.aggregateColumnName(name, function.functionName()));
                if (result instanceof Number) {
                    Number number = (Number) result;
                    newColumn.append(number.doubleValue());
                } else {
                    newColumn.append(result);
                }
                table.addColumns(newColumn);
            }
            results.add(table);
        }
        return (combineTables(results));
    }
}