orthonormal scale

[Kentmey]

Hi,

I've got a problem with plotting data with Labview. I am plotting Nyquist charts, but I was not very happy of the nyquist vi on labVIEW. Therefore, I was wondering how to plot the two axis in orthonormal scale (as shown on the picture). It is not something labview does automatically, and it is rather annoying, and therefore I was wondering whether one of you might have a suggestion for this.

Let me know

Kentmey

[altenbach]

I am not aware of a nyquest.vi in plain LabVIEW. Are you talking about a toolkit?

I am not sure what is specifically important to you in the picture you are showing, but a plain XY graph can probably do that. You can add lines, text, decorations, etc. using the "Plot images" properties. (example)

[Kentmey]

Well, my point on the picture was that the lenght between 0 and 1 is the same on the x and y axis, something that is not done automatically when plotting data with labview.

Does it make it more clear now? this is called orthonormal scale.

Kentmey

[altenbach]

Well, you should (1) turn off autoscaling, (2) right-click...advanced... disable "autoadjust scales", then (3) size the graph area with equal number of pixels in each dimension.

[johnsold]

Kentmey,

You can use property nodes to set the plot area, the scales, and other plot parameters as well as the plane type (to set it to Nyquist).  I suspect that this is new enough and a relatively low percentage of users of XY Graphs that NI decided not to tie several properties together when you select the Nyquist plane or any of the other specialty graphs.

I suggest you customize a graph to get all the parameters set the way you want and make a strict typedef.  Then use that whenever you want a Nyquist plot.

Lynn

[elset191]

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@johnsold wrote:

Kentmey,

You can use property nodes to set the plot area, the scales, and other plot parameters as well as the plane type (to set it to Nyquist).  I suspect that this is new enough and a relatively low percentage of users of XY Graphs that NI decided not to tie several properties together when you select the Nyquist plane or any of the other specialty graphs.

I suggest you customize a graph to get all the parameters set the way you want and make a strict typedef.  Then use that whenever you want a Nyquist plot.

Lynn

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