Measurement Studio Graph to plot with time scale

[RBCHAVAN_77]

I want to plot the graph of the data stored in database. There are 4 parameters and time parameter stored in the database. I want to plot these 4 parameters w.r.t time. All the four parameters are double in data type and time stored in the format hh:mm:ss AM e.g 02:12:55 AM. i am able to plot all the four parameter values but i am not able to assign X axis as time datatype as scatter.plotXY(Double,Double) datatype is required.

Pl help 

Thanks  

[nickb]

Hello - 

I think you would actually find a Waveform Graph better suited to your needs - in conjunction with the AnalogWaveform data type.  The following sample code may be of some use to you.

// create some arbitrary data
double[,] data = { {1d, 2d, 3d, 4d, 5d},
                   {2d, 3d, 4d, 5d, 6d},
                   {3d, 4d, 5d, 6d, 7d},
                   {4d, 5d, 6d, 7d, 8d}};
string[] strTimes = { "02:12:53 AM",
                      "02:12:54 AM",
                      "02:12:57 AM",
                      "02:13:01 AM",
                      "02:13:02 AM"};
DateTime[] times = new DateTime[5];
AnalogWaveform[] waves;
WaveformTiming timing;

// parse out DateTimes from the string times 
for (int i = 0; i < times.Length; i++)
    Debug.Assert(DateTime.TryParse(strTimes[i], out times[i]));

// create the analog waveform array
waves = AnalogWaveform.FromArray2D(data);
// create the analog waveform timing information, irregular because the times don't have a regular interval 
timing = WaveformTiming.CreateWithIrregularInterval(times);
// associate each analog waveform with the timing information
foreach (AnalogWaveform wave in waves)
    wave.Timing = timing;

// configure the x axis to display time
waveformGraph1.XAxes[0].MajorDivisions.LabelFormat = new FormatString(FormatStringMode.DateTime, "hh:mm:ss tt");
waveformGraph1.PlotWaveforms(waves, new AnalogWaveformPlotOptions(AnalogWaveformPlotDisplayMode.Time, AnalogWaveformPlotScaleMode.Raw));

 

NickB

National Instruments