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Everything posted by JKSH
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Anyone have any success installing LabVIEW with Wine?
JKSH replied to Sparkette's topic in LabVIEW General
It's not related to latest vs. older. The patches don't require a login to download (even 2009 SP1 Patch). The full versions require logging in with an account with an active SSP. How does NI, the software's author, see it? Talk to them. If they give you the go-ahead, then go for it. -
Anyone have any success installing LabVIEW with Wine?
JKSH replied to Sparkette's topic in LabVIEW General
I haven't tried WINE, but there is a Linux installer for non-community versions of LabVIEW: https://www.ni.com/en-us/support/downloads/software-products/download.labview.html#344886 (It uses RPM packages) -
Git can't be this terrible, what am I doing wrong?
JKSH replied to drjdpowell's topic in Source Code Control
Shorter alternative A, involving a console: > git branch -f <real_branch> > git checkout <real_branch> The first line forces real_branch's pointer to move from its old spot to your current spot. The second command moves your HEAD from your anonymous branch to your named branch. Shorter alternative B, involving a strong stomach: Delete <real_branch> (yes, you read that right). Create a branch called <real_branch> on the detached head commit. (If the original <real_branch> tracked a remote branch) In SourceTree's "Branches" nav pane, right-click <real_branch> and click "Track remote branch". If it helps, think of it as merging the commit histories of the 2 branches, rather than merging code. Its formal name is a "fast-forward merge". -
VM to umulate a cRIO
JKSH replied to Ratataplam's topic in Application Builder, Installers and code distribution
You might need to try different models of keyboards. See my previous message: Some keyboards work, some don't. Also, after you plug the keyboard into your laptop, you must insert the keyboard into the VM (in VirtualBox, click Devices > USB > [Name of USB Keyboard]). -
VM to umulate a cRIO
JKSH replied to Ratataplam's topic in Application Builder, Installers and code distribution
You're almost there. The NI Linux Real-Time Recovery system is incompatible with the VM's keyboard^. When you reach the prompt, "Do you want to continue? [y/N]", make sure you have a physical USB keyboard connected to your PC. "Insert" it into your VM (on English VirtualBox, it's Devices > USB > [Name of USB Keyboard]), then use the USB keyboard to enter "y". You might need to try different keyboards; I found that: Microsoft Wired Keyboard 600 did not work Logitech K235 worked ^Earlier, you were able to select "Verbose mode" with the VM keyboard because you were still in the GRUB bootloader, not in the NI Linux Real-Time Recovery system yet. GRUB is compatible with the VM's keyboard. -
Geometry 3D Rotation - Failure to Grok
JKSH replied to Gan Uesli Starling's topic in LabVIEW General
I presume you mean the 3D Cartesian Coordinate Rotation VIs. The NI documentation has a decent description of what they do: https://zone.ni.com/reference/en-XX/help/371361R-01/gmath/3d_cartesian_coordinate_rotation_euler/ These are polymorphic VIs. By default, they take an array of coordinates. If you just want to rotate a single point, select the "Scalar" version of the VI (Put the subVI on your block diagram, then Right-click > Visible Items > Polymorphic VI Selector) The 3x3 matrix is the transformation matrix, which is a concept described in linear algebra. There are different types of transformations: Translation, rotation, shearing, scaling, etc. In a nutshell: Think of your 3D point-coordinates as a 3x1 matrix (also called a column vector). If you multiply a column vector by a 3x3 matrix, you will get a new column vector. That new vector will contain your "transformed" point-coordinates. -
Unicode has the ability to store text from multiple languages at the same time. For example, a Unicode file (or Unicode string) can contain French, Russian, Arabic, and Chinese texts simultaneously. However, when you "convert to ASCII"*, you lose that ability. The converter can only output text that matches your Windows locale. So, if your computer is set to a French locale, you cannot convert Russian text. You need a Russian VM to successfully convert Russian text. (*ASCII is not the correct name here, but I digress) Anyway, what version of LabVIEW are you using? If you have LabVIEW 2017 or newer, then your license also gives you access to LabVIEW NXG. NXG has proper, built-in support for Unicode so you don't need to force, interpret, or convert anything.
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NXG, I am trying to love you but you are making it so difficult
JKSH replied to Neil Pate's topic in LabVIEW General
Does a reboot fix things? If not, try clearing your font cache: https://winaero.com/blog/rebuild-font-cache-windows-10/ -
Factory Pattern on a VI running on RT target
JKSH replied to Renny Sadala's topic in Object-Oriented Programming
As a workaround, you can transfer files into a USB stick from your host, and then attach the stick to your VM. -
Ah, you're right. Thanks for correcting me. That explains the why @Xin Li found that "some queries are not executed": If 2 web service VIs try to execute a write query at the same time, one of them will fail.with an SQLITE_BUSY error and the data is lost.
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Write extra code inside your web service VIs. The code should take all the query details (query type and parameters) and take all the SQL VI outputs (results, error clusters) and log them to a text file on disk. However, multiple VIs won't be able to open the log file simultaneously, so you should create a dedicated "consumer loop" in your application. Your web service VIs can pass the log data to the consumer loop via a queue. Although text files don't support concurrent writes, SQLite does. However, it is not bulletproof and it's possible for it to fail: https://www.sqlite.org/lockingv3.html That's why we recommend that you add logging code so that you can see what's going on. [EDIT: SQLite does not support concurrent writes] How do you "see" the error? You can't easily use Probes in reentrant VIs. That's why a log file is recommended.
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Let your application log all queries to a file. Be sure to log the execution results and errors too. Are any queries missing? Do you see any errors?
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No problem. It's not clear to me: Does your lab already use a LIMS? Or does your supervisor want to introduce a new LIMS? The LIMS documentation will tell how how to integrate your test data into the LIMS. Read it to find out.
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Can you explain in more detail what you mean by "LIMS compatibility"? Which part(s) of a LIMS should the software talk to? What does your software do? Ask your supervisor for the LIMS technical manual or user manual. That should give you the technical details of the brand of LIMS that they're using. This webpage describes a LIMS in general: https://thirdwaveanalytics.com/blog/what-does-a-lims-do/
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Voted ages ago. Thanks for posting detailed instructions, @hooovahh: https://forums.ni.com/t5/NI-Linux-Real-Time-Discussions/NI-Linux-Real-Time-PXI-x86-VM/m-p/3561064/highlight/true?profile.language=en#M2107 That's what helped me get started in the first place!
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Yes, that can do the job. It will take some time to write the script, however. (I'd set aside a few days if you've never done VI scripting before) Could you simply modify LibA instead of replacing it with a different library with the same interface?
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Unfortunately, there is no straightforward way to do this in LabVIEW. I can think of one trick which takes advantage of the LabVIEW Project Explorer: When a library gets renamed or moved, the Project Explorer automatically updates the links in all of the project's VIs. So, Close LabVIEW. Temporarily delete or move LibB away to a completely different folder where it can't be found by LabVIEW. Open your project's .lvproj file. Use the LabVIEW Project Explorer to rename LibA.lvlib to LibB.lvlib, saving it in the folder where the real LibB used to be. This will update all your project VIs' links. Click "Save All" on your project to make the update permanent. Close your project. Delete the fake LibB and all the old LibA VIs. Restore the real LibB. Open your project. It should now pick up LibB instead of LibA. (It might complain that the LibB VIs were not in the expected folder. If it does, just "Save All" again and it will be happy after that) Make sure you back up everything before attempting this; rinse and repeat will all your projects. Caveat: If your project uses LibA in more than 1 Application Instance, LabVIEW will lock the library when you open your project, which blocks you from doing step #4.
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Are those front panels part of your intended Embedded UI, or only for debugging? When I run VIs on the cRIO "from source", both (1) and (2) work correctly for me on the cRIO's screen but not on the PC's screen (including preallocated re-entrant VIs). Tested with LV 2017 SP1 + cRIO-903x image in a VM. It is always worth having the cRIO screen visible during embedded UI development because what you see on the PC is not what you get on the cRIO: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019LZ9SAM
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I suggest spending most of your energy on choosing a VCS for your team, as this is the part that takes the most effort for your team to adopt. I'd say that the other aspects (project management/issue tracking, documentation) have a lower barrier to entry. Can you elaborate on which parts of the centralized model are most important to you? I'm guessing it's because a distributed VCS (DVCS) can do just about everything that a centralized VCS can, but the converse is not true (hence my previous question). As a result, the online community (which is far more visible than corporations) are moving to a DVCS. The 2 reasons I can think of for a company to stick to a centralized VCS instead of switching to a DVCS are: Inertia. If the developers are already familiar with an existing tool, there is a cost to switch. They want an extremely high level of control and security over the code base. A centralized VCS makes it a bit harder for a rogue employee to make off which the whole commit history (but it doesn't stop them from taking the current snapshot). If the separate applications interface with each other well, how important is it to still have a single application/platform? Does your team have any existing interactions with the software engineering group? Can you get any support from them? Do you anticipate your team working with them in the future? If so, then the best choice for your team might be whatever the software engineering group is already using. That provides a lower barrier for collaboration between both groups. If you expect to be completely isolated from the software engineering group, then I'm guessing there is not much difference between the possible solutions you have listed. All of them will come with an initial learning curve; the important thing is to pick one, get everyone on board, and get familiarized together. I believe all modern hosting platforms support this. Be aware that none of the common VCSes were designed to work with something like LabVIEW; they were all designed to work with text-based code. So, regardless of which VCS you choose, LabVIEW devs must learn to take a bit more care to avoid triggering conflicts (and learn to handle the conflicts once they occur). How "big" are your team's projects? How often do you produce a new release? Are there parts of your release process where you go, "Man, this part is tedious and error-prone... It would be great to automate this"? CI is most useful when you have a lot of people working on the same code base and/or you have teammates who churn out commits at lightning speed. It can still be beneficial for small teams, but the impact is less pronounced (and the cost-to-benefit ratio is higher) CD is most useful when you want to release often, and/or your release process is tedious. DevOps is most useful for a large organization who wants better collaboration between their developers and their operators, and who want to make deployment more efficient. As you described yourself as a "small team with a badly overdue need for SCC", I suspect these are lower priority for you right now. Again, getting SCC in place first will probably be the most helpful; the automations can always be added after you've tamed the chaos.
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Git can't be this terrible, what am I doing wrong?
JKSH replied to drjdpowell's topic in Source Code Control
Spoken like a true LabVIEW dev 😁 That's a really good idea -
Google isn't revealing anything for me. Who is the manufacturer of this card? (Normally, the NI website hosts documentation of NI products -- even deprecated ones)
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Git can't be this terrible, what am I doing wrong?
JKSH replied to drjdpowell's topic in Source Code Control
That is expected. As I wrote previously, Git and Hg are very similar to each other in scope/functionality (but not in workflow details!). 5 years ago, people were saying that we should just pick one or the other and stick with it; we gained nothing from using both. Today, there is a benefit to learning Git: It gives us easier access to the plethora of code bases around the world, and it helps us move forward from incidents like Bitbucket's bombshell. You have just described Git (and SVN, according to @shoneill). The exact steps differ but the concepts are the same. Agreed. My analogy with an unsaved VI was a poor one, I realized. Unlike a power cut which is quite plausible, it is actually quite difficult to accidentally lose commits unless we ignore prompts/hints/warnings like the ones @LogMAN posted. Yes, Git could be made safer by automatically preserving "detached" branches and requiring the user to manually discard them, rather than automatically hiding them when the user moves away. I guess I've never encountered this issue in my 9 years of regular Git use because I habitually create a branch before making any new commits at an old point. This highlights the importance of running UX tests on people who aren't familiar with a product! -
Git can't be this terrible, what am I doing wrong?
JKSH replied to drjdpowell's topic in Source Code Control
I switched from Subversion to Git many years ago and encountered quite a steep learning curve but it was well worth it in the end -- Not having to be connected to the server all the time was a great boon. I haven't used Mercurial much, but from what I read Hg and Git were supposed to be similar to each other (at least when compared to SVN or Perforce) Yes, your choice of client has a huge impact on your experience. I find GitHub Desktop far too limiting; I like the power of SourceTree but I wouldn't recommend it to newcomers of Git -- too much power and too many options can overwhelm. Having said that, SourceTree supports Mercurial too. Perhaps @drjdpowell can use SourceTree to create and manage a Mercurial project, and then repeat the same steps for a Git project? This might help you to see the parallels between the 2 technologies and learn Git faster. Every single commit in the Git history can be checked out. If you ask git to check out Branch X, your HEAD now points to the latest commit on Branch X. If you ask git to check out Commit Y, your HEAD now points to Commit Y and is now considered "detached" (because it is not attached to a specific branch). To avoid "detached HEAD state", all you have to do is specify a branch when you check out. I have a use-case for entering detached HEAD state: Suppose I've made many commits recently and then discover a bug in my code. I want to go back to an earlier snapshot of my code, so I check out a commit that I think is good. Voila, I'm now in detached HEAD state and I can run my old code for debugging. When my HEAD is detached, I think of it as working on an anonymous/unnamed branch (a bit like how I can edit and run an unsaved VI, but if my PC loses power the VI is gone) Don't let the terminology discourage you; your journey will be worth it. Happy coding! -
Issues syncing up a 4 station tower running 3+ months per test
JKSH replied to Matt_AM's topic in LabVIEW General
I believe DAQmx and XNET have different timing mechanisms. This thread might contain useful clues: https://forums.ni.com/t5/Automotive-and-Embedded-Networks/XNET-Timestamp-and-Windows-Timestamp-Synchronization/td-p/3367619?profile.language=en -
What do you think of the new NI logo and marketing push?
JKSH replied to Michael Aivaliotis's topic in LAVA Lounge