Start, Stop, Step array builder

[Rivetm]

I would like to enter the start, stop, and step frequency to build an array that will hold the value's to feed to a sweep generator.

I have something that works, except for one thing; the stop value. I can't seem to get this thing to stop on the stop frequency value. The step value seems to affect this too. So could anyone take a look at my vi, and help me with this? also, the code looks a little complex for what might seem like a simple thing to do.

[Been bitten by LabVIEW]

Unfortunately, I do not have LV 9, but perhaps you are trying to do a equal test on a double?  If so, try using a test that uses a <=, >=, < or > operator.

A

[altenbach]

No need to make your own! Use the ramp pattern with option "ramp by delta".

Your code is way too complicated anyway. At least you need to insert a "+1" before wiring to N.

[altenbach · Accepted solution]

Anyway, here's a slightly simpler implementation of your code. As you can see, you codes was way more complicated than needed! 😄

Shown below is the ramp pattern implementation (recommended). Both give the same result for sane inputs.

I would definitely use the ramp pattern, because it has better error handling (e.g. if the delta is zero or max is +Inf, etc.).

You can look at the code of it to learn something. 😉

You need to be a bit careful with possible accumulations of binary errors, especially with fractional steps that cannot be fully represented in binary (e.g. 0.1) 

[Rivetm]

All I can say is "wow". That's good stuff. I knew that my code was clumsy, for sure. But I just couldn't get myself out of it. You have shown me how to improve on my own idea, and also shown me something I have never seen before. I cannot thank you enough.

[tbob]

Wouldn't it be nice if we had a For Loop option to set Start, Stop, and Step?  Just like in any other programming language?

[altenbach]

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@tbob wrote:

Wouldn't it be nice if we had a For Loop option to set Start, Stop, and Step?  Just like in any other programming language?

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You mean like this?

[tbob]

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@altenbach wrote:

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@tbob wrote:

Wouldn't it be nice if we had a For Loop option to set Start, Stop, and Step?  Just like in any other programming language?

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You mean like this?

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Yes!  It would be nice if more people would Kudo the idea.  This feature is long overdue.