Array not updated

[angel6700]

Hello,

I'm quite new to labview. I've created a simple program that takes some inputs (start_value, stop_value and step), and creates an array with the corresponding values.

This is what I've done so far:

The problem is that the displayed array, does not show the actual values from the last run, but the ones from the previous. So I must run it twice to get the good values in the array.

Why is it happening? What am I doing wrong ?

Thanks in advance.

[GerdW · Accepted solution]

Race Condition Alarm!

Replace the local variable by a wire to get your VI working correctly!

[angel6700]

Thank you very much !!

Now, it seems it's time to learn the basics of those race conditions !

Best regards !

Angel.

[crossrulz]

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@angel6700 wrote:

Now, it seems it's time to learn the basics of those race conditions !

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General rule of thumb: use a wire if you can.  LabVIEW can be a very highly parallel language.  You have to use wires to force data flow to set the order of operations.

Then when you get a little farther down the experience trail: A Look At Race Conditions

[altenbach]

OK, so you learned about race conditions. Good! 😄

So, while you are "ramping" (sic) up your learning curve, here are some alternatives that will typically give you the same result (your code is the top loop).

Notes: There is a "+1" primitive. Avoid right-to-left wires. Learn about coercion dots.Look inside "ramp by delta" to see how to deal with potentially bad inputs (inf, zero, Nan, etc.). For example, a step of zero will probably run out of memory unless you protect the downstream code from it, etc.