Filter error: 20023

[Natig]

Hi everyone.

I am writing a code where I use a filter function. First i used filter from signal analysis-express. I got 20023 error. I belive my values are okay, although I use very small rate and  s to read. 

Then with ptbypt I get very different chart (in foto). And with simple filter in last code i see nothing in chart. 

I have looked at prevoius forms in community and tried these methods based on them. 

Thanks in advance

[GerdW · Accepted solution]

Hi Natig,

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@Natig wrote:

I am writing a code where I use a filter function. First i used filter from signal analysis-express. I got 20023 error. I belive my values are okay, although I use very small rate and  s to read. 

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The error message is quite clear!

Why don't you define any frequencies on your filter functions?

• Why do you need ExpressVIs (aka FromDDT) to get the sample data from a waveform? Use waveform functions!
• Why do you need to concat an empty array?
• Why do you need to fiddle with t0 of the waveforms when you don't use any of the timing information later on???
• Why are there loop running forever in a Windows application?
• …

[mcduff · Accepted solution]

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@GerdW wrote:

Hi Natig,

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@Natig wrote:

I am writing a code where I use a filter function. First i used filter from signal analysis-express. I got 20023 error. I belive my values are okay, although I use very small rate and  s to read. 

---

The error message is quite clear!

Why don't you define any frequencies on your filter functions?

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I think there is a misprint with the error message, if I am remembering correctly, rather than <= fs/2, it should read < fs/2. I think if you put the Nyquist frequency in you get an error, you have to put in something slightly less. I don't have LabVIEW to test. 

[Natig]

Thank you very much, your comments helped me to improve my code. It appears I did not needed some of the things there. I used sample codes from examples sometimes so I had some unuseful parts in code.