Graph measurements

[samitha95]

Hi,

I would like to get (x,y) coordinates of 40% the maximum value in the area I selected (it is shown in the photo attached below).

It is good to control the selecting area.

Please help.

 

[altenbach]

Please keep related discussions in one place. No need to constantly start new discussions.

Don't use waveform functions if you have arrays!

There is probably no point that has 40% of the max, so I am not sure what x-values you want to get out of this. DO you want a horizontal line?

You can use "array subset" to select the desired range (e.g. based on two cursors) and "array min&max" to get the index and y value of the point, use the index to index into the x array to get the x-value. 

[samitha95]

Thanks @altenbach. I'll keep the discussion in here.

I am new to LabVIEW. Could you please send VI or screen shot of  that created VI.

I want to get 40% of maximum y (vertical) value and indicate the x,y coordinate of that. So have to create user control to select particular range in x axis (which is the area in red color circle- it is depend on the user). Then the VI should be calculate the maximum value of that region and gives the x,y coordinate of 40% of the maximum value position.

[altenbach]

(I don't have a VI, but it should be easy to create. Have you tried?)

It can only give the x-location of the maximum, not of the "40% maximum". Is that what you meant?

[samitha95]

Thanks for your response.

Still I'm trying to create the VI.

Actually I want the x location of the 40% of the maximum. Not the maximum position. 

[altenbach]

There will be more than one "40%" location and they might need interpolation because they are not guaranteed to fall on a point.

[samitha95]

Yeah. That is also a case.

Btw is there any method to get the coordinates when we select a point on the waveform using the cursor?

[GerdW]

Hi samitha,

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@samitha95 wrote:

Btw is there any method to get the coordinates when we select a point on the waveform using the cursor?

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Read the cursor position using property nodes of the graph…

[samitha95]

Thanks a lot @GerdW.

I'll read that.

[samitha95]

Hi,

In my VI, what I want to do is cursor position automatically goes to the maximum amplitude. More details in the photo attached.

How can do that?