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Everything posted by BobHamburger

  1. QUOTE (Karissap @ Oct 26 2008, 10:36 PM) This will work if there is something in your subVI that is holding data in between calls. The most likely culprit for what you're observing is that you have one or more uninitialized shift registers. What you need to ask yourself is "do I need the subVI to keep data or state information from one call to the next?" If the answer is no, then initialize your shift registers appropriately, and you won't require reentrant execution. This will save memory use. If the answer is yes, then follow Karrisap's advice and go for reentrant execution.
  2. QUOTE (crelf @ Sep 29 2008, 10:55 AM) "Work, work, work, work... hello, boys, did you miss me?" You know, just when I thought that I understood all of the gags, I randomly Googled "Le Petomane". Imagine my delight when I read http://en.wikipedia.org/wiki/Le_P%C3%A9tomane' rel='nofollow' target="_blank">this Wikipedia article.
  3. QUOTE (crelf @ Sep 28 2008, 10:37 PM) Your avatar inspired mine, Chris. 35 years since I first saw the movie, and the whole concept of a Yiddish-speaking indian chief still cracks me up.
  4. It makes me want to stand up and salute something. Anything in uniform. A Good Humor man, an usher, or a nun. (Let's see if anybody can attribute that reference.)
  5. Please visit Bob's LabVIEW Insights for discussion of a nifty little utility.
  6. Here's the latest insight and ramblings on My Blog
  7. QUOTE (LV_FPGA_SE @ Aug 20 2008, 09:25 PM) I have a template for a simple single-loop, queue-based enumerated state machine, and I use it as the starting point for just about every VI that I begin writing. Once I can see more clearly what's needed, I may or may not remove the loop, case structure, and queue primitives to simplify the layout. Over the years, I've found it much easier to start with a more complex framework and pare down what I don't need than to try to add state functionality after I've already started coding. Which leads me to another of my favorite interview questions:
  8. I always like to ask them when and why they would use a type definition, and then to distinguish cases where a strict type def might be more advantageous. I've had more than one supposedly "experienced" LabVIEW programmer respond with a blank stare.
  9. QUOTE (jpdrolet @ Aug 7 2008, 11:28 AM) Exactly. The variability of the system time is what motivated me to create this utility. I had an application that extensively used the system time to determine time intervals in a number of different contexts, and there were strange faults in these various modules that eventually were traced to the time primitive not behaving as desired.
  10. QUOTE (eaolson @ Aug 6 2008, 10:23 AM) 1. For PXI RT, there is a specific tick count primitive that's tied to the hardware clock. The general tick count primitive is supposed to be also tied to the same time source, but... if that's the case, then why is there another one specifically for RT? It's just hedging my bets. 2. As a functional global, the loop only executes once anyway, so the indicator gets updated exactly once per call. In this case, inside or outside the loop doesn't really matter. The only reason that there's a loop structure in the first place is to support the uniniti
  11. Absolutely amazing. I almost wet myself watching this.
  12. Val's latest comments and explanation put things into a clearer light. I write from the perspective of having been an integrator for a number of years, and in my current position I use contractors. I can see that Val's position and concerns are somewhat different from mine (and perhaps a large fraction of the LAVA community), and I hope that my statements weren't taken as overly judgemental. I tend to write with passion, as I have grown to despise the weak and ambiguous language that has come to dominate business communications over the last few decades. It's never my intention to incite a
  13. It warms the cockles of my heart to see such enthusiastic and varied responses to this topic. However, I feel compelled to elaborate and add to the chatter. QUOTE (Omar Mussa @ Jul 11 2008, 08:15 PM) I disagree. Style is a necessary component of structure, but it is not sufficient. I have seen too many cases where style was great but architecture was completely lacking. I am working on code right now that is well documented, flows properly left to right and top to bottom, has a consistent icon/connector layout, etc., etc., etc. However, the application is lacking a lot of the att
  14. QUOTE (Yair @ Jul 8 2008, 02:47 PM) Well, to the extent that I tested it under Windows, it appeared to work fine. The RT systems were left running overnight and over weekends, and that's when the memory leaks would eventually cause things to crash. We never did long-term tests under Windows.
  15. I've decided to start my own LabVIEW blog, to share random observations and debugs which I believe could be helpful to my fellow LabVIEW jockeys. Here's my very first entry! Feel free to leave feedback, comments, critique, etc. I hope that my insights can live up to the high standards of this community.
  16. Wire up a Property Node to your VISA refnum. Look for Properties>>Serial Settings>>Discard NUL Characters, and set it to False.
  17. QUOTE (crelf @ Jun 13 2008, 10:46 PM) ...and I watched Blazing Saddles for about the 14,000th time this evening. It never fails to crack me up.
  18. QUOTE (Michael_Aivaliotis @ May 25 2008, 08:17 PM) Science Channel has had live coverage from both JPL and U of A. We should have first images in about 90 minutes. I've been a huge space junky since the first launch that I saw on TV (Gemini 4!) No single human endeavor has produced more useful technology or given a bigger return on investment than the space program, and yet we continue to fund it at barely anemic levels. Consider what we could be doing if we spent $80 billion a year on space instead of Iraq and Afghanistan. And don't get me started on the idiocy of retiring the Space
  19. QUOTE (crelf @ May 19 2008, 09:45 AM) Whoa, man, that's deep. I agree, Justin's explanation is much nicer. He uses his tongue awful pertie. Seriously, though... an old-time method for determining if a TCP connection is valid is to simply send a periodic small-sized message through the channel on a known, repeatable time basis. If for some reason the "heartbeat" isn't seen for longer than the selected timeout period, assume the connection has been lost, and take appropriate actions to re-establish the channel. I've used this to get around LV's somewhat hard-to-predict and occasionall
  20. QUOTE (TobyD @ May 5 2008, 06:08 PM) This is a little simplistic -- it will only work if the cluster only contains a flat collection of basic LV panel objects. The more generic solution would require recursion, so that any contained structures (clusters within the cluster, arrays, etc.) would be drilled into and analyzed also. For guidance, a good starting point to better understand this challenge (and some great code to learn from) is in the OpenG Toolkit: the Variant Config File VIs perform a lot of these very operations.
  21. That kid in the video looks too much like my son. Disturbing.
  22. Solve the problem in the simplest and most efficient manner possible. Points will be deducted for an architecture that is overly complex or for techniques that are not warranted to solve the problem. Do not embellish or try to show off -- it will certainly backfire. Make sure that your work is impeccably neat and well documented. Make your wires as straight as possible and be sure that they don't go behind any structures. Keep things as simple as they can be.
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