LabVIEW
Indexing External Readings
Solved!
Hello,
I'm new to LabView and came across this problem which I hope is very easy to someone more experienced. I am to read a changing value (like from a temperature sensor but in this case a random value from the outside) and save it to an array.
I tried auto-indexing the values as well but every reading comes out as the same.
What can I do to save the unique number to the array per every iteration of the while loop?
Many thanks in advance.
You are reinitializing an array every iteration of the while loop. Moreover, you change its size every iteration.
To add a value to an array while keeping previous values, use a shift register:
Hi rad,
@asciirad wrote:
I tried auto-indexing the values as well but every reading comes out as the same.
You already got a solution…
Now look at your own VI again: it does exactly what you have it programmed to do…
So try to understand your own VI:
- You initialize an array IN EACH iteration. In the first iteration it will be empty because the loop iterator starts with 0…
- Then you run a FOR loop as many times as the outer WHILE loop has iterated…
- Then you replace elements in the freshly initialized array, as many times as the outer loop has iterated…
- You use the very same value to write them into all replaced array elements…
- Once the FOR loop has finished you desplay that array (with all elements having the same value) in an indicator.
- After a little wait you start the same DATAFLOW again…
You should enhance your LabVIEW training (atleast) in two areas: "THINK DATAFLOW" and "array handling"!
@asciirad wrote:
Thank you for your solution, in the end it all comes down to thinking outside the box.
The box is defined by the rules of dataflow and you should think inside that. I also recommend to "just follow the wire!"
A useful tool is execution highlighting. Just click on the lightbulb and then run your VI while watching the diagram. You'll see exactly what is happening. 😄
