Variable time multiplot XY chart
Gurus,
I have reached the point in needing some help. Attached is a simulation of what I am doing. The part I need help with is quite clear...
I need to plot 2 XY graphs: data vs a variable time (although in the example it is fixed). One chart has a single plot, the other 2 traces. The graphs have a fixed length, behave like a waveform chart, except it is first in first out.
The graph in the top level VI labelled Total SA is a single trace plot. When running I can right click and select 'clear graph' and it removes all the data in the buffer.
How can I achieve this with the mutli plot (2 traces) XY graph labelled Total Mass in the top level VI?
Paul.
Message Edited by Manc Pablo on 09-02-2008 12:25 PM
"When I read about the horrors of drinking, I gave up reading"
Attachments:
variable time multiplot.llb 147 KB
Hi Manc Pablo,
Having read through your problem and taken a look at your code I would suggest that you investigate the piece of example code called "XY Graph.vi" in the LabVIEW example finder. This demonstrates the correct coding practice for plotting two traces on a single graph.
I hope this helps but if not please reply with any problems you are having integrating the example code into your own vi.
Regards,
Tom
Applications Engineer
National Instruments UK & Ireland
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Do I need to change the polling rate to 30 or 60 minutes and allow the chart to run for 24 hours before presenting it? Is there any way of producing historical data on RTMT? Any help would be apprecaited.
Regards, JamieHi Jamie,
Indeed in RTMT itself you should be able to achieve it by setting in counter properties "No. of data points shown on chart" to 50.
Next form Edit > Polling Rate. Set it to 30 minutes. Now it shown over 24 hours but with sample rate of 2/hour it may not really be useful.
So it would be better to have a higher sample rate and use the "Start counter logging" option to log the results to a locale csv file. So you can review the data afterwards with permformance log viewer or with Windows permance (perfmon.msc) from that locale csv file. Though you would need to leave RTMT running to log this information. -
Manipulating custom measure variable inside a line chart
Hie Guys,
I have a line chart in my report that contains 2 custom measure variables & 1 measure object from the Universe in the Y axis and one dimension object - "Month" in the X axis.
Formula for the custom measure variables are -
If [Month] = "Jan" Then 45
ElseIf [Month] = "Feb" Then 65
ElseIf [Month] = "Mar" Then 88
And so on..........
Now, I have an input control in the report for "Project Type" (Development & Improvement)
I want the chart to behave as described below.
If (Project Type = "Development") Then only display measure object 1 in the chart
If (Project Type = "Improvement") Then only display measure object 2 in the chart.
Right now, the input controls are displaying all measure objects in the chart when I click on them.
Is there a way I can get the above mentioned functionality in my report? I am using Business Objects 4.0 SP6.
Could anyone please help me solve the problem? Thanks.Hi,
Add Two Line Charts in Report one with [Measure Object 1]
& another with [Measure Object 2] .
Now Create Variable for User Selection .
Selection = ReportFilter([Project Type])
Now in Hide When Property of chart (Right Click on Chart --> Format Chart ) -
Displaying Correct Time in XY Chart
I have an XY Chart displaying current over time. A measurement is made every x seconds. I would like the x axis to represent how many seconds total the measurement was made (ie, the first point at 0 seconds, the second at 5 seconds, third at 10 seconds assuming 5 second intervals).
I want my plot to display the data after it has recorded.
My problem:
If I format the x-axis to absolute time, it always displays the start time as 07:00 PM 12/31 and increments it by one second regardless of how long the interval was.
If I format with to relative time, it increments the seconds by 1 second regardless of the interval.
Maybe I need to use a more sophisticated graph, but it was recommended that I use a chart because I had problems with Labview closing/crashing in the middle of an experiment.
I included my code. Please let me know what you recommend._natalie_ wrote:
Thanks so much for all your help! I find Charts really confusing, but now I understand how to use them with waveforms much better.
I am not sure why I was getting that error, but I opened up an older version of my code, added those few changes and now I have two plots. 1 plots records the current against the date and time, and one records the current against the total number of seconds. I didn't realize that the total number of seconds counts from 1904, but I was able to work around that by substracting the current time and from the amount of seconds since then and it is working. I was able to clear my plots by going to File-VI Properties-Execution and clear indicators when called.
Thanks again! Always very helpful
I ran your application that you attached most recently and it seems to function fine. I'm not sure why you were having trouble. Yeah, just make sure you're clearing that chart of old data.
You can right-click the chart and select Properties > Display Format to change the way that x-axis looks. You can select Absolute Time instead of Relative Time (current settings) to make it look like you want and ignore that thousands of hours since 1904.
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