Does a large amount of "local variable" within a vi cause problems?

Hello -- I am using Labview 7.0 and have a vi where I am going to end up using about 100 "local variables" for indicators that are displaying data. Since I have a lot of true / false case structures I decided to use these local variables instead of having a mess of wiring all over the vi block diagram. It is intimidating though and I was wondering if it causes slowness in vi's?

I actually only have about 8 indicators -- but I am in the process of creating control algorithms so I have to use many case structures if I want to keep the code all within Labview (simplicity). I am simply referencing the 8 or so indicator values many many times (100 X) I am attaching a copy of the vi like you asked but just take a look at the right hand side of the while loop on the right -- it shows an example of an algorithm I created today that has to reference the data from sensors. I would love to know what a better way to do this. Thanks!
Attachments:
ucb drill control daq 1_7.vi ‏666 KB

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dcminter wrote:
How do I assign to rval if it's declared final?You don't and you can't. You're not allowed to assign to the local variable of the outer class for extremely good reasons, so forget about trying.
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Inner class inside a method - how does it access method's local variable?

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fathomBoat wrote:
In java, everything is about pass-by-reference.
Wrong! Nothing in Java is ever pass-by-reference.
Java uses pass-by-value everywhere.
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Managing larger amount of localized data

Hello!
(This is a bit long and maybe fuzzy, it's 1:30AM here)
I have this idea about making a webapp with (among other things) three drop down lists where people can select;
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After someone for example selects "Canada" as country I have a JavaScript to pull some xml/json from my web-app with all the states of Canada.
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apalsson wrote:
jschell wrote:What is huge?Putting all countries, their states and the states all cities as constants in a class file.
It's going to be a very large class which also contains data not necessary all the time.
I doubt that is going to happen. For starters it is unlikely that your market supports that and even less likely that your application does.
Not to mention that maintaining that for the entire world might just possibly be a full time job.
And it still probably doesn't take that much space. After all 1 meg can hold 13,000+ 80 character values.
>
That is a bit problematic.
There are two sides: user data and storage.
For displaying the names you need something to pull the data from. If you want to localize then you will need a localization value.
>
I am using two methods to select the locale, first is by user preferences and the second is what language is configured in their www-browser.
To select a country I use the ISO-standard name ("mx", "ca" or "us") and then depending on what locale the user has selected it can be "Mexico" (for "en" locale), "México" (for "es" locale" or "Mexico" (for "fr" locale).
MIght want to be careful with that. If I am in Arizona and running a shop with employees who principal language is spanish-mexican I don't want to have to specify that my country is Mexico, because of course it isn't.
{quote:title=jschell wrote:}
There are business drivers though. Have you considered what happens when there is a name change? The names do change. If you print a report for a year ago should it display the new name or the old name? A new name means that the report doesn't match what you printed a year ago. A old name might really annoy someone. Might even be illegal.
{quote}
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A description of the general situation:
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The attachment:
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Try replacing the array shift registers with tunnels in the good case and see if you can repeat my observation that using tunnels causes overhead in comparison to shift registers whenever there is no other reason to duplicate the array.
I am running Labview 7 on windows 2000 with sufficient memory so that the page file is not used in this example.
Thank you all very much for your time and for sharing your Labview experience,
Richard Dwan
Attachments:
Fibonacci_test.vi ‏71 KB

> That is an interesting observation you have made and seems to me to be
> quite inexplicable. The trick is interesting but not practical for me
> to use in developing a large piece of software. Thanks for your input
> - I think I'll be contacting technical support for an explaination
> along with some other anomolies involving large arrays that I have
> spottted.
>
The deal here is that the bundle and unbundle nodes must be very careful
when they are swapping elements around. This used to make copies in the
normal cases, but that has been improved. The reason that the sequence
affects it is that it affects the algorithm so that it orders the
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Another, more obvious way
is to use a regular bundle and unbundle, not
the named variety. These tend to have an easier time in the algorithm also.
Technically, I'd report the diagram to tech support to see if the named
bundle/unbundle case can be handled as well. In the meantime, you can
leave the data unbundled, as in the faster version.
Greg McKaskle

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Hello,
I have been told that I need to remove all the local variables in my VI, because they are slow. I can not seem to find a good option for replacing them but keeping the same functionality.
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Zurvan wrote:
I have been told that I need to remove all the local variables in my VI, because they are slow.
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it compiles and runs fine
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Hello,
If i have a code that executes multiple threads , can i identify which thread is operating on a certain field ?
Thanx

Watchpoint events contain the thread that accessed the field.
See
[http://java.sun.com/javase/6/docs/jdk/api/jpda/jdi/com/sun/jdi/request/EventRequestManager.html#createAccessWatchpointRequest(com.sun.jdi.Field)]
[http://java.sun.com/javase/6/docs/jdk/api/jpda/jdi/com/sun/jdi/event/AccessWatchpointEvent.html]
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|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "RAW_PART_NO">'
|| R_PRODUCT_DETAIL.RAW_PART_NO
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "JC">'
|| R_PRODUCT_DETAIL.JC
|| '</variable>' ;
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "QC">'
|| R_PRODUCT_DETAIL.QC
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Thickness">'
|| R_PRODUCT_DETAIL.THICKNESS
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Width">'
|| R_PRODUCT_DETAIL.width
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Length">'
|| R_PRODUCT_DETAIL.length
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Overlay">'
|| R_PRODUCT_DETAIL.OVERLAY
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Options">'
|| R_PRODUCT_DETAIL.OPTIONS
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Stop">'
|| R_PRODUCT_DETAIL.stop
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Profile_No">'
|| R_PRODUCT_DETAIL.PROFILE_NO
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Door_Style">'
|| R_PRODUCT_DETAIL.DOOR_STYLE
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Glaze">'
|| R_PRODUCT_DETAIL.GLAZE
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Shape">'
|| R_PRODUCT_DETAIL.SHAPE
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Glass">'
|| R_PRODUCT_DETAIL.GLASS
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Hinge_Side">'
|| R_PRODUCT_DETAIL.HINGE_SIDE
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Hinge_Type">'
|| R_PRODUCT_DETAIL.HINGE_TYPE
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "EGE">'
|| R_PRODUCT_DETAIL.EGE
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Door_Style_Code">'
|| R_PRODUCT_DETAIL.DOOR_STYLE_CODE
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Finish_Technique">'
|| R_PRODUCT_DETAIL.FINISH_TECHNIQUE
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Hinge_Location">'
|| R_PRODUCT_DETAIL.HINGE_LOCATION
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Construction_Type">'
|| R_PRODUCT_DETAIL.CONSTRUCTION_TYPE
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Panel_Type">'
|| R_PRODUCT_DETAIL.PANEL_TYPE
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Panel_Profile_No">'
|| R_PRODUCT_DETAIL.PANEL_PROFILE_NO
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Rail_Profile_No">'
|| R_PRODUCT_DETAIL.RAIL_PROFILE_NO
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Rail_1_Length">'
|| R_PRODUCT_DETAIL.RAIL_1_LENGTH
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Stile_Profile_No">'
|| R_PRODUCT_DETAIL.STILE_PROFILE_NO
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Rail_2_Length">'
|| R_PRODUCT_DETAIL.RAIL_2_LENGTH
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Stile_1_Length">'
|| R_PRODUCT_DETAIL.STILE_1_LENGTH
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Stile_2_Length">'
|| R_PRODUCT_DETAIL.STILE_2_LENGTH
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Panel_1_Width">'
|| R_PRODUCT_DETAIL.PANEL_1_WIDTH
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Panel_1_Length">'
|| R_PRODUCT_DETAIL.PANEL_1_LENGTH
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Panel_2_Width">'
|| R_PRODUCT_DETAIL.PANEL_2_WIDTH
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Panel_2_Length">'
|| R_PRODUCT_DETAIL.PANEL_2_LENGTH
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT ||'</label>';
/*-----------------------------------------+
| Handling XML data for special message |
+-----------------------------------------*/
FOR rec_count IN c_count (r_product_detail.item_id)
LOOP
L_XML_CONTENT := L_XML_CONTENT || '<label _FORMAT='
|| '"'
|| 'lib://FRD/SpecMessage_Door.btw'
|| '"'
|| ' _PRINTERNAME='
|| '"'
|| v_printer
|| '"'
|| ' _QUANTITY='
|| '"'
|| v_quantity
|| '"'
|| '>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Serial_Number">'
|| REC_COUNT.SERIAL_NUMBER
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Special_Message">'
|| REC_COUNT.ATTRIBUTE_VALUE
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT || '<variable name= "Cabinet_Sequence_No">'
|| REC_COUNT.CABINET_NUMBER
|| '</variable>';
L_XML_CONTENT := L_XML_CONTENT ||'</label>';
EXIT WHEN c_count%NOTFOUND;
end LOOP;
-- L_XML_CONTENT := L_XML_CONTENT || '</labels>';
fnd_file.put_line (fnd_file.LOG, l_xml_content);
dbms_output.put_line ( l_xml_content );
L_LABEL_COUNT := L_LABEL_COUNT + 1;
-- apps.inv_print_request.sync_print_tcpip (l_xml_content,
-- l_job_status,
-- l_printer_status,
-- l_status_type,
-- l_return_status,
-- l_return_msg
END LOOP;
END LOOP;
l_xml_content := l_xml_content || '</labels>';
fnd_file.put_line (fnd_file.LOG, l_xml_content);
apps.inv_print_request.sync_print_tcpip (l_xml_content,
l_job_status,
l_printer_status,
l_status_type,
l_return_status,
l_return_msg
L_XML_CONTENT := null;
/*--------------------------------------------------------------------------------------+
| APPS.INV_PRINT_REQUEST.SYNC_PRINT_TCPIP will send the XML data to TCP/IP Port |
+--------------------------------------------------------------------------------------*/
fnd_file.put_line (fnd_file.LOG,
'Printer Status:' || ' ' || l_printer_status
fnd_file.put_line (fnd_file.LOG,
'Return Status:' || ' ' || l_return_status
fnd_file.put_line (fnd_file.LOG,
'Return Message:' || ' ' || L_RETURN_MSG
COMMIT;
EXCEPTION
WHEN OTHERS
THEN
fnd_file.put_line
(fnd_file.LOG,
'Unexpected error in the xxmb_get_xml_data_1270 procedure, error is : '
|| SQLERRM
|| ', '
|| SQLCODE
END xxmb_get_xml_data_1270;
END xxmb_wip_prod_tag_door_pkg;
/

How to use functional global with a large amount of variables?

Hi all,
I'm currently developping a LV program which control and acquired data from a device. Up to now I used global variables ( very conveniente to use for experimental parameters). But now my program is become to be too large and I have too much "global" variables to continue to use a global.vi.
I'm wondering if functional global can help me. If someone has an exemple of how use functional global with a large amount of variables...
thanks

I agree with Ben.
Using queues is better than a number of Globals or Action Engines (Functional Globals). If you need to pass data to a sub-vi, you can simply wire the queue out to a queue control of a sub-vi, or a reference. See attached example of passing data to a sub-vi using a queue. The example is an extremely simple, undocumented tid-bit of code that sends the loop count to the consumer VI.
Run the main program called QueueProducer.vi.
R
Attachments:
QueueProducer.vi ‏18 KB
QueueConsumer.vi ‏14 KB

Local variable accessed within inner class

Hey everybody,
My program keeps telling me that it wont work because one of my methods is calling a local variable inside an inner class. Does anyone know what this means and how to fix it?
Heres the code:
public class SliderExample extends JPanel{
int value=0;
public SliderExample(int imw, int imh, Image img, BufferedImage buf, Graphics2D biCon){
super(true);
this.setLayout(new BorderLayout());
JSlider slider= new JSlider(JSlider.HORIZONTAL,0,imw,25);
slider.setMinorTickSpacing(10);
slider.setMajorTickSpacing(100);
slider.setPaintTicks(true);
slider.setPaintLabels(true);
JButton redraw= new JButton("Scroll");
redraw.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ev){
reDraw(slider,img,buf,biCon,imw,imh);
add(slider,BorderLayout.CENTER);
add(redraw,BorderLayout.AFTER_LINE_ENDS);
public void reDraw(JSlider slid, Image im, BufferedImage bf, Graphics2D biC, int iw, int ih){
value=slid.getValue();
Graphics g= getGraphics();
g.drawImage(im,value,0,iw,ih,this);
g.drawImage(bf,value,0,iw,ih,this);
biC.drawImage(bf,value,0,iw,ih,this);
Any ideas???
THanks,
Rick

Its getting them from another class thats calling the mothod to construct the slider bar with dedraw button. Thats a pretty big class but I will post the code where I called the method:
public class Process extends JFrame implements MouseListener, MouseMotionListener{
private int [][] points;
private int [] lengths={0};
private int [] bin;
private String imstr;
private String imsav;
private int imgw=658;
private int imgh=512;
private int xArrayPos=0;
private int yArrayPos=0;
private int xpos=0;
private int ypos=0;
private int xprev;
private int yprev;
private int xadd;
private int yadd;
private String filstr;
Image image;
SimpleGUI gui;
BufferedImage buffer;
Graphics2D biContext;
Graphics2D g2;
BufferedImage last;
Graphics2D lastContext;
public Process(){
JFrame slideFrame = new JFrame("Please slide to scroll image");
slideFrame.setContentPane(new SliderExample(imgw, imgh,image,buffer,biContext));
slideFrame.pack();
slideFrame.setVisible(true);
Thats what anything having to do with that function in the other class that calls the Slider Class.
Do you know how I can fix this??
Thanks,
Rick

Does a large amount of "local variable" within a vi cause problems?

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