How do I create a dynamic 2xN array?
Hey All,
I've got a question that seems pretty easy in concept but for some reason I just can't quite figure it out. All I want to do is run through a matrix using for loops and if a value in that matrix is equal to the value I set (my cutoff value), I take the coordinates (the iterations of the loops) and pop them into an array, which I hope to use as a set of graphable points. So I start out by building a 2x1 1D array from the two points I get (my loop iterations again, which would represent my X and Y values), by using the Build Array VI. Now I try feeding that into another Build Array VI that has a feedback loop on it which feeds back into itself. The output from this is then sent to an Array Size VI (which is outside the loops) so that I can see just how big my 2xN array got.
Now the good news is that I do get a 2D array as an output. The bad news is that try to get the data exactly when my cut off point occurs (ie. if(data == cutoff) ) I get no size, but if I created a range of even one lower (ie. if( (data <= cutoff) || (data >= (cutoff-1))) ) then the size of my array turn out to be 2x49152, which is the total range of my data (192*256). Now I know for a fact that not every point in my data is one less than my cutoff point (which is the maximum value in this case) as I have a meshing that shows me the values. I also thought that maybe conflicting data types might be a problem, so I converted my cutoff value from a int to a float type. No dice there either. Soooo, I figure it must be some underlying logic that I'm missing or something that LabView does differently than I expect.
I guess my actual question is this then: Why does LabView gives me either a 0 element array or a complete array (as in ALL the data points not just the ones at the cutoff value)? Also if there is a better way to build the array than this.
I have attached a picture of my current set up that retrieves the data points, builds the 2xN array and gets the size. If there's any other part that you may need to see, just let me know.
Thanks,
Phil
[url=http://img114.imageshack.us/my.php?image=buildinganarrayjl7.jpg][img=http://img114.imageshack.us/img114/3226/buildinganarrayjl7.th.jpg][/url]
P.S. Here's an direct link to the image if the above doesn't work: http://img114.imageshack.us/img114/3226/buildinganarrayjl7.jpg
If I understood you correctly, you want to find the indices where the array element value matches a certain fixed value. One thing you must understand is that you must never perform equality operations on floating point values with computers. Computers operate in base 2, while you operate in base 10. It is not possible to precisely represent a floating point number using computers. This issue comes up a lot. How you choose to do the comparison depends on your numbers and what level of precision you want.
That said there is no need to use a formula node for simple arithmetic. LabVIEW has functions to do that, and they're much faster than using a formula node. Don't try to write LabVIEW code using text-programming techniques. It won't work. I don't use Feedback Nodes because I hate them. I prefer shift registers since they're much easier to understand, and you can't accidentally flip their direction. Here's a simple implementation using shift registers. That little white plus function is a custom function to check if a floating point value is approximately equal to some value, within a specifed number of decimal places.
Message Edited by smercurio_fc on 08-12-2008 04:59 PM
Attachments:
Example_VI.png 10 KB
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1.I using the binding ArrayCollection legendDP as the Legend's dataprovider, the Legend's showing not changed when the legendDP changed
2.How can I fill the Legend's color,the result has no color showed.Can anyone help?
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How do I create a dynamic parameter based on a formula?
Hi,
I've developed a report, in CR 11, that is parameterized based on the field "ticket_date". I've created a Min and a Max formula so that I can select a date range. This works wonderfully. However, my date list is growing longer by the day and each day I have to run the report I need to scroll through an even longer list of date values. This will become increasingly impractical with each passing month and year. I would like create a "Year" paramater and a "Month" parameter so that I can first select the Year, then the month(s), then the dates.
When I attempted to create a parameter based on the formula, "Year (), the formula wasn't in the list of available values to create a parameter on.
How can I address this requirement?
thanks in advance!
MarkHi Abhilash,
Looks like I was able to create a Year field in the Command - thanks for the tip!
Before I close this off as answered can you take a look at two sets of SQL I wrote in the Command that I'm getting errors on and offer advice on where the error is occurring.
Example 1
The SQL I attempted to write must be close though:
Select ft.sequence, ft.ticket_date, coff.office_name, comp.subscriptions_id from
field_tickets as ft, company_offices as coff, companies as comp
INNER JOIN jobs ON comp.companies_id=jobs.companies_id
INNER JOIN field_tickets ON jobs.jobs_id=field_tickets.jobs_id
LEFT JOIN company_offices ON jobs.company_offices_id=company_offices.company_offices_id
Where comp.subscriptions_id=7.00
When I attempt to save this I get an error:
"Failed to retrieve data from the database. Details: Exception: Error Message: Java Heap Space"
Example 2
I get the error, "Not unique table/alias: 'custom_jobs_values'" for the following SQL Command
SELECT companies., jobs., field_tickets., regions., customers., custom_jobs_values. FROM
companies, jobs, field_tickets, regions, customers, custom_jobs_values
LEFT JOIN custom_jobs_values ON jobs.jobs_id=custom_jobs_values.jobs_id
INNER JOIN regions ON companies.regions_id=regions.regions_id
INNER JOIN jobs ON companies.companies_id=jobs.companies_id
INNER JOIN field_tickets ON jobs.jobs_id=field_tickets.jobs_id
INNER JOIN customers ON jobs.customers_id=customers.customers_id and
companies.subscriptions_id=4.00
thanks!
Mark -
How can I create a dynamic XML driven PDF Portfolio?
I have built an XML application for which I maintain a library of individual PDF page "templates" used to assemble large (1000+ pages) PDF documents. The page templates are saved as PDFs without page numbers as they can be reused anywhere in any manual, the page numbers are applied during the document assembly process. I am now attempting to implement an update process, in which one template change can impact dozens of large documents. I am therefore looking at moving away from creating these large PDF documents and creating something more along the lines of a Package, Portfolio or other solution in which document pages/templates in the library are linked to rather than combined, so that changes across multiple large documents can be done quickly and transparently to the user. I am sure there is a solution using an Adobe spec like Portfolio or XDP, I just need a nudge down the right path, as nothing in what I've read explicitly states that these technologies can be used for this purpose. I would prefer to stay within technologies I am comfortable with to create/modify the necessary files, whcih are XML/XSLT and ANT. I would also like to know if it's possible to add page numbers on the footer of each page in the Portfolio without modifying the template, and if the resulting Portfolio can be saved as a normal PDF or printed with the dynamic page numbers included.
I know this might be a tall order but if anyone can help clarify what's possible with existing Adobe technologies it would be greatly appreciated.
Thanks,
KeithIndeed - PDF Portfolios are a collection of static files attached to a one-page cover sheet, you cannot have references to externally-stored documents.
You can replace individual files in a Portfolio (by adding a file of the same name) but nothing happens automatically, and the file when added to the Portfolio will have no idea about where it originally came from. There's no concept of "check for updates".
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