Calculate from graph cursor data

I need to calculate from cursor data in a grpah that has been read from a file and displayed. Specifically, I want to position locked-on-trace cursors and calculate the delta-time or delta-voltage from their positions like one would with a standard scope. Attached is a file of the trace to read, 2 channels, Cursors would be on either ch-1 or 2. Simple read VI attached.
Attachments:
Read_and_chart_data.vi ‏31 KB
s250.txt ‏13 KB

Here's a very simple example. You just have to use the graph's property node to get the cursor position. If you know the sample rate, you can fine tune it to display actual time.
Attachments:
Read_and_chart_data_mod.vi ‏44 KB

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Error 1055 on Graph cursors.

I am using LabView 2010, expanding on one of the example vis for data acquisition. I want to use graph cursors to allow someone to zoom in on a particular part of a graph. To do so, I have been trying to use property nodes. When a graph has more than one cursor, the property nodes seem to access only the highest indexed cursor. So, I tried to apply a property node to a graph with just one cursor. In particular, I tried to access the x-value of the cursor. When I then run the vi, I get error 1055 "Object reference is invalid". I had hoped to construct the property nodes for one cursor, then add another cursor, and attach property nodes to it. There does not seem to be a way to use property nodes to specify which cursor I am accessing. I have tried a property node with two properties: select cursor as an input, and x-value as an output. The "select cursor" property input seem to have no effect at all.
Is there an example vi for programmatically extracting information from graph cursors?
Joe Rudmin
Solved!
Go to Solution.

Joe,
Please take a look at my screen shot as a reference for getting the x position for a cursor on a graph object. I hope this helps.
Right clicking on the graph and hover over create then property node, cursor, cursor position then cursor x. This should create a property node that gives the position of the cursor on the graph. I understand you are trying to use multiple cursors but this will get you started.
Kyle Hartley
RIO Product Support Engineer
National Instruments
Attachments:
cursor position.JPG ‏42 KB

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How do I calculate days from two different dates?

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How do I calculate days from two different dates in XI/PI?

Hi all,
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Wanted to fetch data from ref cursor to nested pl/sql table getting an erro

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declare
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Your query selects 3 separate columns therefore requires 3 collections of corresponding types. You want to treat those 3 columns as an object of DEPT_LOC_REC1 type:
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2 type cr is ref cursor;
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4
5 lv_dept_loc_tb dept_loc_tb;
6
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12 /
declare
ERROR at line 1:
ORA-06504: PL/SQL: Return types of Result Set variables or query do not match
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2 type cr is ref cursor;
3 cr_obj cr;
4
5 lv_dept_loc_tb dept_loc_tb;
6
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11 end;
12 /
PL/SQL procedure successfully completed.
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What is the alert log reporting. Are you seeing any other errors than these in the alert log too?

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Calculate from graph cursor data

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