How to append data to save file without overwriting? Using create file / write to file / close file

[etvg]

Well there's no code in the True condition, and the stacked sequence, which has the data collection code inside, is within the false condition. Unless, of course, I'm overlooking a different case structure. The original creator had a rather janky way of doing things.

[Ben]

As a quick sanity check, just wire a True constant to the case structure to prove that you can write more than one line to a file and determine if therer is something wonky about the conditions that heed to be met.

Ben

[etvg]

I'll give that a test once the data collection is over! 

[altenbach]

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@etvg wrote:

Well there's no code in the True condition ....

In the code I am looking at, the FALSE case is empty, while only the TRUE case writes to the file. If your's is different, please attach the correct code.

.

[altenbach]

Also note that you are creating a new unique file with each run, so make sure you are not looking at a stale data file from long ago.

[etvg]

That's my fault, I thought you were talking about the larger case structure, I am looking at an older version of the code on a different machine and forgot about that case structure to delete the first few rows. Sorry about that. I can completely remove that case structure and see if it works. Only reason that is there is because the function generator acts up and creates false data at the beginning. 

[etvg]

The code writes to multiple lines by the way, it just won't produce data from multiple data collections. 

[altenbach]

What's your definition of "multiple data collections"? (Successive runs? Successive iterations of the outer loop? Something else?)

[etvg]

So the innermost for loop within stacked sequence 5 scans resonances of a frequency range defined on the front panel. By multiple data collections I mean scan and record this frequency range multiple times (as well as populate the output file with the frequencies and resonance amplitudes from all the scans). 

[etvg · Accepted solution]

I am relatively sure I solved this issue by getting rid of the shift register on the "How many scans?" for loop, making the save file subVI refnum and error nodes "last value" to replace the shift registers and deleting the "close file" function.