I have waveform graphs in Labview which are actually pictures of eddy currents from experiments. How can I activate my cursor and select part of the graph and crop it? Are there any examples I can use? Please help!

[megs]

~Megan

[Gorka Larrea]

Megan,
If I have understand you well, you have a graph and want to take out a part of it (as a BMP?). In this case, you can use the zoom to decide which part on the graph to select, and then use SnapView from Gtoolbox at gtoolbox.topcool.net to make this graph a BMP. You must be careful with the position of the graph, which you must define in screen coordinates. If i misunderstood you tell me.
Hope this helps

[megs]

I meant that I was taking the graph and cropping it to make a sub array of the same graph by selecting a portion of the graph. Sorry for the confusion! Any suggestions you have would be quite helpful!
~Megan

[Dennis_Knutson]

You can get the cursor indexes and use them to feed to the Array Subset function.

[littlegreen]

Hi, where can I find the "cursor indexes"? And can I save the coordinates of cursor?

In addition, I am not sure how to do something below about graph. Hope that you can help me out. Thanks. 🙂

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1. Smooth the raw data by different amounts

2. Add a constant to either the x- or y-axis values of any plot.

3. Multiply the x- or y-axis values of any plot by a constant.

4. Divide one plot by another

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[Dennis_Knutson]

Depending on which version of LabVIEW that you're using, the cursor indexes are available from either an attribute or property of the graph. As far as the numeric operations, a graph's attribute/property node also has such things as the start and increment that can be manipulated at run time. Also, since the input to a graph is an array, you can use the normal math functions on the array to add, subtract, multiply, divide by constants or another array.

[Photon1]

Megan -

I have attached an example that returns only the data that falls between the X max & min labels. If you zoom in on a particular portion, the data that is returned is only the data that falls within your zoomed X axis.

Hope this is of some help.

Jim