Continuous XY graph with real time and data

[Thuba25]

Hello all,

I wish to do the following: 

I want to generate random numbers in one column on my array and have the second column with the current time and date. I want to then plot only the random numbers that have been generated along with the TIME from the Get Date/Time function. I want to put this into an array and plot them with a XY graph rather than in a spreadsheet. 

I have done this top part. 

However, I would like it to run continuously, instead of waiting to gather the data, and THEN plotting the numbers. Essentially, the random number generator i put is supposed to represent an 1d array that will be constantly updating itself from signal inputs continuously. 

Side note: For my purpose i want to get the time indepent, rather than use a waveform chart and use the internal clock of that vi. I would liek to use an XY graph and not a waveform chart/graph.

Thank you.

[altenbach]

Use the "build xy graph*" express VI and set it to not clear data between calls. Now simply give it one point with each call and it will act similar to a chart.

* place the "express xy graph" and you'll get that automatically on the diagram.

[Thuba25]

I can't use the time output to connect as the X input for the express XY graph vi. They are not of the same type

[altenbach]

Attach your VI. Of course this can be made compatible!

(Of course you could just build your data up in a shift register. probably the preferred solution)

[Thuba25]

Thank you for your help !

[altenbach]

Insert a "to DBL" into the timestamp wire.

The graph terminal needs to be inside the loop. Why do you have so many loops???

[altenbach]

try this.

[Thuba25]

Why is the time stamp converting into a number like that? 

Also, I would like the graph to update the data continuous by shifting the data over. Instead of squishing the data points together.

I feel liek i shuld resort to a waveform chart...

[altenbach]

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Thuba25 wrote:

Also, I would like the graph to update the data continuous by shifting the data over. Instead of squishing the data points together.

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Can you describe that in more technical terms? You can change the autoscaling of the x axis in any way you want.

Maybe you want to use a fixed history size. This woiuld need to be done externally. You could also use the "collector express VI".

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@Thuba25 wrote:

I feel liek i shuld resort to a waveform chart...

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Are the data points spaced equally in time? I assumes they are not, else why would you use an xy graph in the first place?

[Thuba25]

Ideally, I would liek to display what the waveform chart is displaying in the XY graph. If you run the program continuously, i want to see the past data as well and let it update itself . "shifting the window" of the chart. The X-axis should be real time and the y values should be in array format.