Extract the x,y values of two cursors in the same xy graph

I would like to extract the x,y values of 2 cursors in the same xy graph. The problem is i arrive to extract the value only for one curso. How can I do to extract the value of the other cursor ?
Regards,
Sylvain
Solved!
Go to Solution.

Property nodes operate top to bottom, so all you need to do is change the "active cursor" property first. Here are two possibilities.
Message Edited by altenbach on 08-07-2009 09:04 AM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
ActiveCursors.png ‏8 KB

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How to display multiple signals on the same chart/graph

Hello,
I have a text file that has 21 different signals acquired through NI DAQ. I am able to read the file and display on the chart but the problem is all the signals have the same dynamic range -6 to +6 so when plotted they all show up on top of each other and one cannot really discern whats going on. Please see the attached image.
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Using Stack Plots was my first thought too but it appears to be buggy these days. I know I've used it before with no problems but I can't get it to work now at all. In any case, stacking 21 plots will be futile since you won't be able to see any detail (unless you have a VERY tall monitor). Your best bet is to use property nodes to make the plot of interest become highlighted in some way.
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With two cursors on just one waveform graph, how can I acquire the X values of each cursor to use them in other functions?

I can get the x values of each function to display on the front panel with no problems, but I have not been able to acquire this information from the front panel.

You use a property node to programtically retrieve the cursor values. For each cursor, first use the property Active Cursor to select (0 for the first and 1 for the second) and then the property Cursor Position:Cursor X. See the attachment.
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cursor_position.jpg ‏212 KB

How do i plot with the operating system time in one plot and show lines between cursors in another using the same XY graph?

I am having some trouble graphing two plots at once. One plot is to show the current temperature inside a chamber as a function of time. I am trying to pick the current time and temperature each second and plot it with each point being connected by a line. I am able to show a moving, blinking dot each second but I can't figure out how to develop an actual line with these dots. To make matters worse, the blinking dot is back in the year 1903. I understand that it uses seconds elapsed since 1903, and am trying to find out how to graph the current temperature with the system time.
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Main Module Chamber Testing I_O every 30 sec.vi ‏288 KB

You're not creating the XY graph data correctly. I've attached an example with a couple of simple XY Graphs. One is using a couple of shift registers to hold the spearate x and y arrays. I think this is what you were trying to do. The other one uses a VI from the shipping examples called XY Chart. It makes an XY Grpah act like a chart. I've also shown the correct way to display current time.Message Edited by Dennis Knutson on 05-12-2005 03:51 PM
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Is it possible to extract the text and images using PHP, in the same order as it is in the PDF?
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Dear Mike,
Thanks for your quick reply,
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Hi All,
I have a requirement to send the two file from the third party system(GXS) to SAP ECC via SAP PI(version - 7.4). We are using AS2 adapter at the sender side to pick the file and using File Adapter to place the file in ECC.
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Hi Guys,
The above requirement is solved now.
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How to display 4 graphs on the same graphs display when running the VI 4 times ?

My goal is trying to display 4 different graphs on the the same XY graph when I run the VI 4 times. Right now, the new graph will overdrive the previous graph when I re-run the VI.
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Go to Solution.

You need a mechanism for storing previous data; LabVIEW graphs do not have a history, they display sets of data. A shift register is an obvious answer, but it can get somewhat "tricky" when the Build XY Graph is used as it accepts a DDT and you cannot simply append a data set using array functions...
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Rather than make the changes for you, I've created a simple example for a regular graph to show you how to use an un-initialized shift register to store values from previous runs (the data will be lost when the VI is closed) as long as the VI is in memory.
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Message Edited by B O B on 11-20-2009 04:53 PM
-Bob
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Example 2.vi ‏12 KB

How do you get multiple plots to show up on the same graph?

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Here is a sample in 7.0 format.
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20 plots on XY graph.vi ‏31 KB

How can I get extract the data between two cursors on an XY graph

How can I get extract the data between two cursors on an XY graph

Well, you say xy graph, so this might be a more complicated problem.
For a waveform graph it's trivial. Simply get the two cursor indices (property: cursor index) and apply them to array subset of the data. Is that all you need?
Here's how the above code would look like. using cursor.index instead of cursor.x elimnates the need to include scaling information.
For an xy graph, there could be multiple segments (e.g. imagine a spiral that passes the desired x range multiple times from both sides). This would neeed significantly more code for a general solution.
Message Edited by altenbach on 11-24-2009 07:53 AM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
cursorsubset.png ‏17 KB

Using two cursors, one for updating salary values in the emp table

Using COPIES of the employee and department tables provided by Oracle or using similar taples that provide employee, salary, job and dept in one table and dept number and department name in another table, write the following program. Use the dept table to step through sequentially and bring up the records with the same department from the employee table. Using an IF statement calcuate a new salary based on the job (you decide on the criteria). Update each record on the employee file (this is why you should use copies) with the new salary. In addition, calculate the total salary for each department and create a new table with the department number, the department name and the salary.
I'm able to update the salary values, but I'm not sure how to insert those updated values into an empty table the way this problem is asking me to.
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declare
v_deptno emp.deptno%type;
v_job emp.job%type;
v_sal emp.sal%type;
v_dname dept.dname%type;
v_deptsal totalsal.deptsal%type;
cursor salup_c is
select job,sal
from emp,dept
where emp.deptno = dept.deptno
for update of sal;
cursor totdeptsal_c is
select dname,sal
from emp,dept
where emp.deptno = dept.deptno;
Begin
open salup_c;
loop
fetch salup_c into v_job,v_sal;
exit when salup_c%notfound;
if v_job = 'CLERK' then
v_sal := v_sal + 10;
else
if v_job = 'ANALYST' then
v_sal := v_sal + 20;
else
if v_job = 'MANAGER' then
v_sal := v_sal + 30;
else
if v_job = 'PRESIDENT' then
v_sal := v_sal + 40;
else v_sal := v_sal + 50;
end if;
end if;
end if;
end if;
update emp
set sal = v_sal
where current of salup_c;
open totdeptsal_c;
v_deptsal := 0;
loop
fetch totdeptsal_c into v_dname, v_deptsal;
exit when totdeptsal_c%notfound;
v_deptsal := v_deptsal + v_sal;
insert into totalsal
values(v_deptno,v_dname,v_deptsal);
end loop;
close totdeptsal_c;
end loop;
close salup_c;
end;
/

The script is actually inserting some values into the new table but look at what I'm getting
Here it is: i only want the dept number ,the dept name, and total salary for each department.
SQL> @ sndprob;
PL/SQL procedure successfully completed.
SQL> select * from totalsal;
DEPTNO DNAME DEPTSAL
RESEARCH 1620
SALES 2410
SALES 2060
RESEARCH 3785
SALES 2060
SALES 3660
ACCOUNTING 3260
RESEARCH 3810
ACCOUNTING 5810
SALES 2310
RESEARCH 1910
DEPTNO DNAME DEPTSAL
SALES 1760
RESEARCH 3810
ACCOUNTING 2110
RESEARCH 2460
SALES 3300
SALES 2900
RESEARCH 4625
SALES 2900
SALES 4500
ACCOUNTING 4100
RESEARCH 4650
DEPTNO DNAME DEPTSAL
ACCOUNTING 6650
SALES 3150
RESEARCH 2750
SALES 2600
RESEARCH 4650
ACCOUNTING 2950
RESEARCH 2110
SALES 2950
SALES 2600
RESEARCH 4275
SALES 2550
DEPTNO DNAME DEPTSAL
SALES 4150
ACCOUNTING 3750
RESEARCH 4300
ACCOUNTING 6300
SALES 2800
RESEARCH 2400
SALES 2250
RESEARCH 4300
ACCOUNTING 2600
RESEARCH 3815
SALES 4655
DEPTNO DNAME DEPTSAL
SALES 4305
RESEARCH 6010
SALES 4255
SALES 5855
ACCOUNTING 5455
RESEARCH 6005
ACCOUNTING 8005
SALES 4505
RESEARCH 4105
SALES 3955
RESEARCH 6005
DEPTNO DNAME DEPTSAL
ACCOUNTING 4305
RESEARCH 2110
SALES 2950
SALES 2600
RESEARCH 4305
SALES 2600
SALES 4150
ACCOUNTING 3750
RESEARCH 4300
ACCOUNTING 6300
SALES 2800
DEPTNO DNAME DEPTSAL
RESEARCH 2400
SALES 2250
RESEARCH 4300
ACCOUNTING 2600
RESEARCH 3690
SALES 4530
SALES 4180
RESEARCH 5885
SALES 4180
SALES 5760
ACCOUNTING 5330
DEPTNO DNAME DEPTSAL
RESEARCH 5880
ACCOUNTING 7880
SALES 4380
RESEARCH 3980
SALES 3830
RESEARCH 5880
ACCOUNTING 4180
RESEARCH 3290
SALES 4130
SALES 3780
RESEARCH 5485
DEPTNO DNAME DEPTSAL
SALES 3780
SALES 5360
ACCOUNTING 4960
RESEARCH 5480
ACCOUNTING 7480
SALES 3980
RESEARCH 3580
SALES 3430
RESEARCH 5480
ACCOUNTING 3780
RESEARCH 3830
DEPTNO DNAME DEPTSAL
SALES 4670
SALES 4320
RESEARCH 6025
SALES 4320
SALES 5900
ACCOUNTING 5500
RESEARCH 6040
ACCOUNTING 8020
SALES 4520
RESEARCH 4120
SALES 3970
DEPTNO DNAME DEPTSAL
RESEARCH 6020
ACCOUNTING 4320
RESEARCH 5850
SALES 6690
SALES 6340
RESEARCH 8045
SALES 6340
SALES 7920
ACCOUNTING 7520
RESEARCH 8060
ACCOUNTING 10080
DEPTNO DNAME DEPTSAL
SALES 6540
RESEARCH 6140
SALES 5990
RESEARCH 8040
ACCOUNTING 6340
RESEARCH 2360
SALES 3200
SALES 2850
RESEARCH 4555
SALES 2850
SALES 4430
DEPTNO DNAME DEPTSAL
ACCOUNTING 4030
RESEARCH 4570
ACCOUNTING 6590
SALES 3100
RESEARCH 2650
SALES 2500
RESEARCH 4550
ACCOUNTING 2850
RESEARCH 1920
SALES 2760
SALES 2410
DEPTNO DNAME DEPTSAL
RESEARCH 4115
SALES 2410
SALES 3990
ACCOUNTING 3590
RESEARCH 4130
ACCOUNTING 6150
SALES 2660
RESEARCH 2220
SALES 2060
RESEARCH 4110
ACCOUNTING 2410
DEPTNO DNAME DEPTSAL
RESEARCH 1770
SALES 2610
SALES 2260
RESEARCH 3965
SALES 2260
SALES 3840
ACCOUNTING 3440
RESEARCH 3980
ACCOUNTING 6000
SALES 2510
RESEARCH 2070
DEPTNO DNAME DEPTSAL
SALES 1920
RESEARCH 3960
ACCOUNTING 2260
RESEARCH 3830
SALES 4670
SALES 4320
RESEARCH 6025
SALES 4320
SALES 5900
ACCOUNTING 5500
RESEARCH 6040
DEPTNO DNAME DEPTSAL
ACCOUNTING 8060
SALES 4570
RESEARCH 4130
SALES 3980
RESEARCH 6040
ACCOUNTING 4320
RESEARCH 2120
SALES 2960
SALES 2610
RESEARCH 4315
SALES 2610
DEPTNO DNAME DEPTSAL
SALES 4190
ACCOUNTING 3790
RESEARCH 4330
ACCOUNTING 6350
SALES 2860
RESEARCH 2420
SALES 2270
RESEARCH 4330
ACCOUNTING 2620
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Two listener for the same queue - different extraction rule

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Unfortunately, I've already evaluate the message selector option, but in the following case:
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From two given tables, how do you fetch the values from two columns using values from one column(get values from col.A if col.A is not null and get values from col.B if col.A is null)?

From two given tables, how do you fetch the values from two columns using values from one column(get values from col.A if col.A is not null and get values from col.B if col.A is null)?

Hi,
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How to extract the values from WPBP table

Hi experts,
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Regards;
Okan

Extract the x,y values of two cursors in the same xy graph

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