Guide the fool to create graphics?

Hello

I'm new to LabVIEW (using v8.5.1) and have a question about plotting a graph on the front panel.

I have a vertical slider that has an applied basic formula. It's all in a while loop. How can I draw out of the scabbard (once the formula is applied) against time on a graph on the front panel.

A graph of the waveform will not let me connect to the output of the formula (automatically show it as a cut wire), and if I use a waveform table I just get a horizontal line with the x-axis increases quickly. If I move this line moves to the top and to the bottom of the y-axis. The time on the x-axis value seems to go up to 10 ^ 6 very quickly when you use the graphical waveform block...

Any suggestions on how I can do this, while the graphic display, say, 100 seconds of data that updates in real time the cursor is changed? I tried locking of the scale of the x-axis, but it doesn't matter.

Thanks for the help :-)

How often are you writing to the cursor/chart? If it's in a while loop with no wait function, then you update several thousands per second. The table has a size of default buffer of 1024 points. Once you have reached this number, the old data are ignored. In addition, the default delta t of the x-axis is 1, so you must change the dt parameter to match the rate of loop in order to accurately represent the hour.

How many times do you really need to update the slider? To view the 100 seconds of data, you would set the size of the buffer at least equal to 100 * samples/s. So, if you had an expectation of 100 ms in the loop, it means that 10 samples per second * 100 to a buffer size of 1000. The default setting would be sufficient. Set the sampling rate of 10 milliseconds and you need a buffer of 10,000 points. To change the buffer size, right-click on the chart and select "Chart History Length". To make sure the x axis reflects your actual sampling frequency, you can right click, select scale X > properties > Sacles and change the value of the multiplier. You can also programmatically. Look at the example of navigation called real time graph.

PS, It's not a good idea to have a while loop without some sort of waiting. Spinning constantly loop will be used a lot of time cpu windows and prevent you to interact effectively with the controls on the front panel.

Tags: NI Software

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