RPM labels every 100 rpm on xy graph

[Coryman]

I found an example that labels every point on a plot.  Since there are 360 points on my plot, it would be confusing, so I want to limit it to 36 labels.  The key appears to be the use of the annotation list.  Also, since there is no cursor in the polar plot vi, I’m using this method.  Anyone out there successfully plot a polar plot (NyQuist Plot), using a XY graph?

The data includes magnitude and phase readings.  There is also an RPM column in the data file.

thanks in advance.

[Henrik_Volkers]

Why not use two plots: One with all the n points  and interpolation (?) colored .

a second plot with a decimated number of your first plot and all points labeled and only show the point , no interpolation.

Decimation by m or exactly the frequencies you defined ...

[Coryman]

Before I drive myself crazy, is this even possible?  I have a txt data file up of three columns, Revolutions per minute, Magnitude in Mils, and Phase in degrees. The data plots perfectly using the Polar Plot vi.  I have tried to add the RP to the 'Magnitude and Phase' input array but the 'Autoscale Polar as Needed.vi' input data array grayed out.  I think this is my problem.  It won't let me add the RPM array to it.  Do I need to do something to the vi so I can edit it?  If not, I don't have a problem with bringing the RPM into the Polar Plot vi without taking that data through the Autoscale vi, since that is only required to scale the data to the graph.  The RPM will be used to plot text along the graph at various locations.  Any help is greatly appreciated.

Ron

[Coryman]

Henrik,

Good Day!  Yes, I am open to all ways to get this done.  I am attempting to do this on the 'nasty' Polar Plot.vi, so I know I have my work cut out for me.  I have successfully grown the input data array to include RPM, so I'm on my way!

[Coryman]

Found some errors in my vi.  Here is the fixed version.