How to read from .csv file in this case

[Matipa]

Hi forum,

I was finally able to save my waveform into .csv format, but now i have little problem with opening it and show it on my existing waveform graph. I know it should be inverse of saving but something evidently goes wrong. Can I count on your help, please?

Saving into file: 

Trying to read with this:

[natasftw]

The wire is broken.  What does it say when you hover over it?  From the picture, it looks like you're trying to wire two inputs into each other.

[GerdW]

Hi matipa,

right now you are parsing the first element in the CSV string again and again. You need to track the scan position or use the remaining string output of the ScanFromString function...

[TCChun]

Hi matipa,

As GerdW stated, the read vi is only reading the first element of the string in the for loop. An alternative way would be to use the spreadsheet to array vi or Read Delimited Spreadsheet express vi to convert the string into array, then auto-index the array into the for loop to extract the information.

The broken wire is caused by wiring multiple waveform input into one waveform graph. To multiplot on a waveform graph, please refer to this KB: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019LyxSAE&l=en-US

[Matipa]

Hmmm, Do You mean something like this?

[GerdW]

Hi Matipa,

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@Matipa wrote:

Hmmm, Do You mean something like this?

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No.

You only need to convert from spreadsheet string to array once before the loop.

And you should convert to an array of strings as you want to parse timestamps and numeric values…

[crossrulz]

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@Matipa wrote:

Hmmm, Do You mean something like this?

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1. You don't actually need the Open/Create/Replace file function here.  Just wire your path the the Read Text File.

2. Right-click on the Read Text File.  There is an option in there to "Read Lines".  Now wire a -1 to the "count" input.  This will read your entire file as a array of strings (each line being an element of the array).  Now autoindex on this array and you can use the Scan From String inside of your FOR loop like you already had.

[Matipa]

I made this, it works, but when I wire the exit of builed waveform to the existing wavegraph i see this error:

When i add new wavegraph it looks good:

Is there any posibility to do it on the same graph?

[GerdW]

Hi Matipa,

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@Matipa wrote:

I made this, it works, but when I wire the exit of builed waveform to the existing wavegraph i see this error

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THINK DATAFLOW!

You cannot connect two data sources (BuildWaveform and DAQmxRead) by a wire!

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@Matipa wrote:

Is there any posibility to do it on the same graph?

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Yes, sure.

Read the context help of the graph (terminal) to learn how to display more than one plot in a graph…

Spoiler

It takes an array of plots - like an array of waveforms…

[Matipa]

Done, it is possible to connect this two waveforms in one, but then i having next problem (in two places):