Plot XY graph from while loop
I am trying to make a curve tracer with a DC power supply, DAQ, and Labview 7.1. Everything is ok, until I want to plot an x-y plot from a while loop. I can do this function fine using a for loop and cluster cells, but I need the while loop for the interruption function. When I change to the while loop, it had data formating issues, but I believe I have it to something that should work. It seems like my xy plots want to graph (the auto scale moves the axis respectively) but I do not get a line. I'm not sure if Labview is seing this as just one point and not an array, or if there is a labview bug. Attached is my code with a few different trials to make an xy plot. If anyone can be of help I would be very thankful.
-Jon
Attachments:
Curve_trace_w_relays_while.vi 122 KB
If it works in a FOR loop, but nor in a while loop, most likely your output tunnels are not autoindexing (FOR: on by default, WHILE: off by default). Right-click on the output tunnels and select "enable indexing".
If you want to watch your graph update during the while loop, you could accumulate your x and y data in a shift register and graph it. (See attached modification).
LabVIEW Champion . Do more with less code and in less time .
Attachments:
Curve_trace_w_relays_whileMOD.vi 74 KB
Similar Messages
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How to Send Multiple Plot XY Graph from LabVIEW to Microsoft Excel
The link below describes exactly what I would like to do, however the link to the solution/work around does not work.
Has anyone got an alternative solution?
http://digital.ni.com/public.nsf/allkb/CFD30D5E9C01AB5386256CFB0082AF3EPlease check the link again as it seems to be working fine now.
How to Send Multiple Plot XY Graphs from LabVIEW to Microsoft Excel:
http://digital.ni.com/public.nsf/allkb/CFD30D5E9C01AB5386256CFB0082AF3E
The standard Excel Insert Graph.vi cannot insert multiple XY Graphs to Microsoft Excel, so you will need to use the Report Generation Toolkit for Microsoft Office. You will find a link to an example program at the bottom of the page. I have also attached it below.
Attachments:
example.zip 35 KB -
Real time waveform graph in while loop
Hi
I have a VI which includes a subVI that reads data from an oscilloscope and presents the output in the form of a cluster made up of the initial time t(0), a time interval delta t and an array of voltage readings.
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Bex.As usual, you have several options.
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This account is no longer active. Contact ShadesOfGray for current posts and information. -
Keeping data on graph once while loop exits
Hi, I have the attached vi where I am reading in Bluetooth data, plotting and saving the data. My inner while loop is the one performing the plotting, where I have the error out of the Bluetooth Read function wired to the boolean control of the loop. If for some reason the connection gets distrupted, the loop exits and the BT automatically reconnects. The problem here is that one the inner loop stops, the graph plotting the data clears. I am looking for a way to keep the data plotted on the graph, so once the connection is lost and reconneted again, the data continues plotting from where the connection was lost. I cannot figure out how to do this, I tried to use local variables to plot the data outside the graph while the loop is running but that didn't work. Can somene provide me assistance?
Attachments:
test.vi 55 KBmoderator1983 wrote:
My bad...!!
I was working late night and misinterpretate "Write to File" express VI with "Build XY Graph" express VI..!!
Anyways the attached code should work fine.
Here, I took care of some of your Rube Goldbergs.
I'll try to get something written up to show a Queued Message Handler...
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
Attachments:
I love clean code more.vi 53 KB -
I'm attempting to create a calibration program, using the printer port, and a Vernier Serial Box by modifying a calibration program designed for the serial box.
There are six calibration points, and to collect them, I have it controlled by while loops so that the numbers are taken when a button is pushed, and this is inside a sequence structure so that I can get the six different points. I feed these numbers into two different arrays (for x and y values) and then try to use the linear coefficient analysis on these points, but the values for the slope and intercepts it returns are not correc
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Stu -
hello,
I have a problem with one of my applications I am developing.
I calculate a timeSeries and I need to graph it on linechart. The timeSeries is calculated through an iteration of For Loop
I have tried to write in an array, but it didn't work since I can only take one value.
I tried to write the value in a datagrid but that didn't work either!
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http://alimsyed.comHi Dimitris,
Thanks for the post and I hope your well today.
You can achieve this by using a reference of the graph from the main VI, pass it to the subVI vi and use a property node to update the graphs value.
I have attached an edit of your code to show this, labVIEW 8.6.
Kind Regards
James Hillman
Applications Engineer 2008 to 2009 National Instruments UK & Ireland
Loughborough University UK - 2006 to 2011
Remember Kudos those who help!
Attachments:
mainVI.vi 9 KB
subVI.vi 13 KB -
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Hi all,
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I have tried this:
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Hw can we plot a graph from the data given in a flat file
i need a program that reads a file with 2 columns:
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Plot the last m minutes, the y axis shall have a range from min...max.
Start with parameter values m=5, speed s=1, min=20, max=120.
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You can download the test data file here:
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http://alf42.dyndns.org/oost/temperature_diagram_example.gifhi
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Your code is rubbish. You also did not use code tags. But let's examine the rubbish points shall we?
import java.awt.*;
import javax.servlet.*;There is no need for you to import servlet here. Especially as this later appears to be an applet.
import java.lang.*;Importing java.lang is redundant.
import java.applet.*;
public class classfile{This is a poorly named class for several reasons. One it does not follow conventions, class names should begin with a capital letter. Two classfile is just a stupid name.
Also your class should most likely extend applet if indeed you mean to write an applet. This is probably pointless because you probably don't mean to write an applet, it's just that you have no clue.
>
int n=0;
String lable[];
int value[];
blic void init()
try{
n= Integer.parseInt(getParameter("column"));n is pointless since everything is hardcoded anyways for four elements
lable = new String[n] ;
value=new int[n];
lable[0]=getParameter("lable11");
lable[1]=getParameter("lable12");
lable[2]=getParameter("lable13");
lable[3]=getParameter("lable14");
value[0]=Integer.parseInt(getParamater("c1"));
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value[2]=Integer.parseInt(getParamater("c3"));
value[3]=Integer.parseInt(getParamater("c4"));
catch(NullFormatException e )This is garbage.
System.out.println("Null format Exception");
public void pain(Graphics g)While I am forced to agree with the sentiment here the correct name for this method is paint.
for(int i=0;i<n;i++)
g.steColor(color.red);That is garbage for a variety of reasons.
g.drawString(lable, 20, i*50+30);
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So try again. Maybe learn some Java first? Just a suggestion. -
How to plot a graph from text file?
This is driving me nuts!
I would like to plot a list of numbers in a text file to a graph. Each munber is on a new line, like this -
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etc.
I managed to import the file and split it with the 'Spreadsheet to array' function but can't get much further than that.
Help would be much appriciated.
Ben HYou just need to use the Read From Spreadsheet function and wire a 'True' to the transpose input. Wire the 1D array output to a graph.
Message Edited by Dennis Knutson on 10-20-2006 12:40 PM
Attachments:
Read From Spreadsheet.PNG 28 KB -
Writing thermocouple data to measurement file from while loop
Hello,
I'm trying to write thermocouple data that has already been filtered into a measurement file. My code works, but has many zero-time entries (probably from the filtering aspect), and some of the non-zero-time entries are even out of sequence (my output file is attached as well as my VI.) I'd love any help regarding getting this to work!
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Attachments:
FrontPanel.jpg 211 KB
ThermocoupleDAQ_IOrtiz.vi 67 KB
test1.csv 63 KBHi Megan,
do you really need to sample thermocouple data at 1kHz? How fast does the temperature change - and how fast do thermocouples react on that temp change? (Which sample rate is recommended for your hardware?)
Are your filter settings reasonable? "TC2 unfiltered" looks quite ok, while the "filtered" graph looks awful (atleast for a TC measurement)…
And you should definitely fetch a constant number of samples from DAQmxRead. Usually you read 1/10th of the sample rate, so reading 100 samples for 1kHz sample rate!
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Hi
I want to exit from loop if error is encountered.
THanksHi Sonu,
This is not a question related to the SDK. This is more of a coding question you should probably try something like StackOverflow or MSDN forums for that next time.
Regarding your question it depends on the language you are using. If you are using c# you can use the keyword "break;" inside an if that checks for the error. In VB you can use "Exit For" or "Exit While".
Best regards,
Pedro Magueija -
Move plotting to inside a while-loop
Hi I have a plot that occurs outside a whileloop, and another that is constructed inside the whileloop.
How do I get the plots to run synchronously in the same waveform chart?
I've tried looptunnels, I've tried shiftregisters but neither solves it.
Below is a picture of my attempt to get'em together.
Hoping for some help.
Kindest regards,
Lasse
Attachments:
Multi-Function-Synch AI-AO Test B.vi 44 KBThis should do what you requested, but it will keep adding data until you hit stop or memory is full.
You'd have to add some sort of data truncate function to limit how much history is displayed.
(The hidden case is 0, it adds the first acquired chunck of data to the shift register)
Troy
CLDEach snowflake in an avalanche pleads not guilty. - Stanislaw J. Lec
I haven't failed, I've found 10,000 ways that don't work - Thomas Edison
Beware of the man who won't be bothered with details. - William Feather
The greatest of faults is to be conscious of none. - Thomas Carlyle
Attachments:
plot inside.png 35 KB -
Quit from while loop inside a vi that run a while loop
Hello,
this is just an example
i have a led that blink inside a subvi and i what to stop it form the ui of the user (MainHelp.vi)
but because the subvihelp.vi dont know the stop button it will not stop when i klick on the stop button
How i can work it out with out using global Var
thanks for your replay.
Attachments:
MainHelp.vi 9 KB
SubVIHelp.vi 9 KBHi
Here is one method to stop a blinking VI in a SubVI. I tried not to change your version of how the blinking works. Since the subVI is running continuously this example calls the VI using static reference and using the control names. You could also use a queue to pass values to the subVI controls.
Your original VI has a lot of stuff that made no sense, so I cleaned them all out or up, so to speak.
Good Luck.
Mark Ramsdale
Attachments:
MainHelp.vi 12 KB
SubVIHelp.vi 9 KB -
How can I opearate indicator outside while loop?
I do small program, I have many while loops and I want to connect wire (in my application) from each loop to AND gate then to another while loop, but how can I operate these wires to agree with the change of my application inside while loops.
If not clear :
In another words, suppose I want to operate indicator ouside the while loop. How can I operate indicator outside while loop, so when my application become TRUE (inside while loop) the indicator will be ON (outside while loop) and when my application become FALSE(inside while loop) the indicator will be OFF (outside while loop).
Help me if you have any idea please..........................Hi Rammo,
For the wire to carry the boolean condition from the while loop to an 'and' gate outside, the while loop must stop running
If you want the while loop to keep on running and still pass a boolean value to a destination outside the while loop, use any one of these: property nodes, global or local variables.
i am still not clear as to what you intend to say by this sentence
" I want the wire that comes out from the while loop will become TRUE if it in my application is TRUE inside while loop and the opposite is true. Because I want to connect the wire that comes out from while loop to AND gate than to another application"
plz tell me if the first part of this mail of mine answers your doubt or do you need more information?
regards
Dev
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