Algorithm that can calculate the shortest path between 0-360 degrees for an AC servo motor.

[billko]

How does Bob's solution stand up to the "golden" VI?

[altenbach]

Here (bottom) is alternative code that gives the same (probably incorrect!!!) result as the code by constructionworker (top).

Arguably slightly simpler 😄

[constructionworker]

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wiebe@CARYA wrote:

This seems to give the same results as the presumably working example.

At least for the 5 values I've tested:

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Thanks for your answer.

This seems to work. 🙂
I almost started banging my head against the walls.

At least according to the chart here it looks error free.

I waited for a while and was able to better describe the problem once I understood what was required. I think the bird's nest helped explain the situation better 🙂

[altenbach]

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wiebe@CARYA wrote:

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@altenbach wrote:

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wiebe@CARYA wrote:

At least for the 5 values I've tested:

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Well, In this case it is simple to do an exhaustive analysis of all 360x360 possible inputs. For at least 1/8th of the samples, there is a difference in the "send to motor" command. I doubt any version is actually correct. 😄

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Not that it helps, but I think the Current input isn't limited to 0 or 360, it can be anything...

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Yes, but it can always be Q&R'd into 0..259. It is safe to say that if your version (I am not going to use the word "solution" for anything posted here! 😄 ) differs in the shown range, it is not the same.

We can easily expand the exhaustive 2D test for a much wider range of one of the inputs.

[BertMcMahan]

Me trying to follow this thread-

[constructionworker]

Thanks everyone for your effort. Problem solved.
The exact desired algorithm is as follows.

[altenbach]

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@constructionworker wrote:

Thanks everyone for your effort. Problem solved.
The exact desired algorithm is as follows.

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A greedy loop is never the solution.

Make sure you wear safety goggles and keep your fingers out of the device when testing with actual hardware. 😄