Circle Plot

[fgoulao]

Hi all,

I am trying to make a quite simple program, where I want to plot a simple circle, using parametric equations.

The equations I am using are:

X=Xc + Ro cos (theta)
Y=Yc + Ro sin (theta)

where Xc and Yc are the centre points of the circle and Ro its radius.

I need to use a tool like "Simulate Signal" or something like this to generate the signal that will plot the graph (or not)?

If so, this signal will be my theta variable, which I need to constraint it, between 0 and 2 (PI). Is it possible?


Thanks,

FGoulao

[ML927]

I think you can just calculate theta on your own. Here's a possible solution 😉

[GerdW · Accepted solution]

Hi F,

simple like this:

Or even more simple:

[altenbach · Accepted solution]

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GerdW wrote:

Or even more simple:

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Yup, that's what I normally do. 😄

 

[ToeCutter]

Those solutions are very elegant if you are familiar with complex numbers, however they add confusion for those not.

The alternative is just to bundle the x,y values from the sine and cosine functions into the (non-complex) form compatible with an x-y graph input.

[GerdW]

Hi Christian,

I'm glad I got this right before you could engage in this thread

@Toecutter:

Atleast for me complex numbers were taught in school (9th or 10th grade), with exactly that example: how to display sine/cosine values in the complex number plane…

[altenbach]

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@ToeCutter wrote:

Those solutions are very elegant if you are familiar with complex numbers, however they add confusion for those not.

The alternative is just to bundle the x,y values from the sine and cosine functions into the (non-complex) form compatible with an x-y graph input.

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Learning complex numbers might actually  be easier than learning two different trigonometric functions as well as cluster bundle operations. 😄

(... as long as we stick to the basic things as described in this thread.

It gets a bit more complicated if we e.g. multiply a complex number with a complex number of (1,theta), which corresponds to a rotation in the complex plane. Multiplying by a complex number of (scale,theta) does a scaling and rotation in one step. Very useful. :D).

[fgoulao]

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@ML927 wrote:

I think you can just calculate theta on your own. Here's a possible solution 😉

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I have an older version of LabVIEW (2012) and I cannot open your solution.

Are you able to send me a solution under LV 12?

[GerdW]

Hi f,

we are talking about just 3 functions in our examples.

Aren't you able to find them?

[ML927]

Yup, GerdW and Altenbach's solutions are much more easier to apply than mine 😉