LabVIEW
Writing Waveform data into CSV file
Hi arpix,
@arpix wrote:
My only problem is that that every time when i start the project to creat the curve i would like to create a new csv file and not to wirte the data in same csv file. Could someon help me how shall i do that?
When you want a "variable" filepath then you should not use a "constant" filepath!
Why don't you build your path using some parameters (like timestamp) to "create a new file every time"?
There is a BuildPath function in the file functions palette. And there is a FormatIntoString function to format any parameters into a string…
On your image:
- Why do you set the "Y" array of the waveform "Graph created with CSV curves" twice? Do you know what happens with the inputs at this SetWfmComponents function?
- Where is the label of the graph indicator?
- You only save the Y data to a CSV file, but you forget about all the other waveform parameters!? Is this intended/required?
- Why did you mark that BuildPath example with a red cross?
Hi arpix,
@arpix wrote:
- Why do you set the "Y" array of the waveform "Graph created with CSV curves" twice? Do you know what happens with the inputs at this SetWfmComponents function?
Answer: I could not find any better solution to compare two Wave form on one graph. Basically 1 wave form is created based on parameters the secound on is reading out one already created csv file.
You didn't answer to my question.
@arpix wrote:
- Where is the label of the graph indicator? Answer: Not really sure what do you mean under this?
The graph indicator in the middle (just behind the BuildArray node) doesn't has a label.
There shouldn't be any terminals without labels in the block diagram!
@arpix wrote:
- Why did you mark that BuildPath example with a red cross?
Answer: I was trying with that something out but i am getting some errors... Not really know how to continue... so that is just a try....
Which errors did you encounter?
We cannot help until you describe the errors you see!
(And we cannot debug/edit/run images with LabVIEW: when there are problems with your code then you should attach your code…)
Hi GerdW,
Thank you for pointing me some of my problems.
Unortunatelly i was unable to answer you because i am a new on this forum so i could not reply 24h.
Ah, sorry — yes, you pointed out the error I hadn’t noticed. I’ve already fixed it. But some extra explanation would be great from your side. Regarding the two y input. I know that the first is for Y axis. The 2nd Y input was not showed correctly on the graph. what is wierd.
The graph without a name is the Comparison Graph for the two waveforms. Yesterday I think I managed to find a solution to my problem. Thank you for pointing out the major issues and key points. I still have to work on it.
I’ll take any good advice on what’s wrong and what should be improved.
Hi arpix,
@arpix wrote:
Yesterday I think I managed to find a solution to my problem. Thank you for pointing out the major issues and key points. I still have to work on it.
I’ll take any good advice on what’s wrong and what should be improved.
Improvement:
Simpler way to create your 2D array of time&sample.
(Maybe you need to transpose to get the same CSV file as you get now.)
@arpix wrote:
The graph without a name is the Comparison Graph for the two waveforms.
And you still don't give a label for that graph!
I repeat: "NEVER delete labels, you may hide them in the frontpanel…"
Also don't get into the habit of "wiring backwards": try to keep the block diagram on one (FullHD) screen with wires from left to right! (Basic styleguide rule!)
@arpix wrote:
Regarding the two y input. I know that the first is for Y axis. The 2nd Y input was not showed correctly on the graph. what is wierd.
It's not "weird", it's expected!
There is only one Y array in a waveform: writing to that array twice will simply overwrite the first data array…
