rCall = "result = filter(dataset, F.low=" + lowFDouble + ", F.up=" + upFDouble + ")";
parameters.put("lowFDouble", lowFDouble);
parameters.put("upFDouble", upFDouble);
filter = new JavaFilterByF();
} else if (jRBByTimePeriod.isSelected()) {
String begin = jTextFieldBegin.getText();
String end = jTextFieldEnd.getText();