what data structure should i use to store Signal's 1.Frequency 2.Starting time 3.Ending Time for a Time v/s Frequency Plot [closed]

I am developing a qt-quick application which is used to monitor the real-time charts for Time v/s Frequency Graph-plot.In this application i have to keep track of

1. frequency of signal
2. Initial time of signal
3. Ending Time of signal

What data structure should i use to store this parameters of a signal.