LabVIEW features and converting to C or C++ codes

I am new user to LabVIEW, but many my coworkers are refusing to use the LabVIEW on any new project. The reason is very hard to do design review when the application is adding new features or fix the bugs. Is there anyway we can convert LabVIEW code into LabWindows and/or C/C++ codes? Why LabVIEW is more popular than LabWindow/CVI in the industries? How are other companies doing design or code reviews?

I think you confuse some things here:
a) Design review:
Design reviews should be part of the design phase in the development process. It is strongly suggested to perform this phase without use of programming languages (famous pen'n'paper phase!).
"Design" could incorporate flow charts, data charts or object oriented design (OOD). All those are concepts independent of any programming language.
You might refer to "code reviews" which are done during implementation phase and they have to check if the code matches
- style guides (code layout, documentation, ...)
- modularity
- desired design
They are done on code implemented in *any* programming language. LV is a programming language, just like C/C++. The basic rules for reviews is true for both. Reviews can be done with both.
b) Conversion of programming languages:
LV is a complete, self-contained programming language called "G". It is different to C/C++ in regard of syntax and semantic. Porting G-code to C-code is possible (using a module). BUT: Do you write C/C++ code just to convert it to .NET code later on? Most probable not. So why doing this to G-code???
c) Complexity of adding/changing features:
Again, this is a pen'n'paper task in the first instance. Starting of implementing changes works for small projects, but large projects suffers badly by this. Simply make it a rule: Implementing this is only small "routine work" within a project. Desinging modularization and algorithm is something which has to be done "offline" and independent of the used programming language.
LabVIEW is popular in academic and even industries since it is very easy to implement certain design desicision (e.g. flow charts, since THIS essentially is LV code!). So the "routine work" of implementation is getting shorter/faster....
Norbert
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

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Hello to all! I am a student of Mechanical Engineeringfthat very little has been using this software. I present the problem: for a matter which is called Biomechanics, I and my colleagues, we have developed the design of a rheometer, which is controlled by LabVIEW2011. Since we are still at the experimental stage, always has been simulated using labview: the whole experience. So, labview, at present, not only controls the stepper motor through the frequency sets, but also simulates the output (in the specific, the response to the torsion of the cartilage, simulated with a low pass filter of the second order). All this was done by my colleague more experienced than me, who today passed me the finished project that in his pc works perfectly while not in mine (we have the same version of labview, but different version of office). In practice, the program is fine (there is no arrow "Run" broken) and the simulation with the creation of the sine graph (response of the cartilage) is done perfectly. My colleague then set labview in order to save the data to an excel sheet at the end of the simulation, asking the user where to put it (the excel file must already exist, labview does not create it). The excel file should contain two columns and a scatter plot (one column represents the frequency, f, of the stepper motor, the second represent the shear modulus G, which increases as the frequency increases and the graph represent the trend of G in function of f). As soon as I decide to save the data, excel opens, for an instant appear the scatter plot and data in columns but immediately after the graph disappears and remain only the columns with data (so I have to make the graph "manually") and labview gives me the following error:
Error -2147023170 occurred at Property Node (arg 2) in NI_ReportGenerationToolkit.lvlib:Excel_Insert_Char
t.vi->NI_Excel.lvclass:Excel Insert Graph.vi->NI_ReportGenerationToolkit.lvlib:Excel Easy Graph.vi->SaveExcelFile.vi->Progetto 2.0.vi
This error code is undefined. Undefined errors might occur for a number of reasons. For example, no one has provided a description for the code, or you might have wired a number that is not an error code to the error code input.
Additionally, undefined error codes might occur because the error relates to a third-party object, such as the operating system or ActiveX. For these third-party errors, you might be able to obtain a description of the error by searching the Web for the error code (-2147023170) or for its hexadecimal representation (0x800706BE).
What can I do?
Thanks. Regards
Solved!
Go to Solution.

The LabVIEW Report Generator in LabVIEW 2010 and more recent versions does, indeed, work very well with Excel in Office 2010. I helped someone about two weeks ago with a problem saving a series of measurements to a (new) Excel Workbook. Your problem differs in two ways -- you want to save in an existing Excel file (why? Aren't you worried about overwriting data, or are you trying to add a new WorkSheet, or append to the end of an existing WorkSheet?) and making a Chart. I've not tried charts, so don't have advice right now.
Judging by your error message, it is the Chart feature that is giving you trouble. Can you see how your code runs if you eliminate the Chart functions? [You can do that by putting a "Diagram Disable" Structure around the Chart code, clicking on the top of the structure and wiring the wires through in the Enable case].
Give that a try and let us know what happens.

Labview Control and Function menu's stopped working.

Most of the menus no longer work. The top level menu will pop up with a right click but the submenu's do not. I cannot get to the submenu which contains a While Loop for example. If I use the stickpin feature then I can navigate the menu's fine.
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Very unusual. Thanks in advance for any help.

I figured it out. The only changes I had made to my system was some video card drivers. I have 2 monitors and use Win2k Pro.
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I think an older version of GarageBand could also read and convert midi files, but this no longer appears to be the case either in the latest version.
How can I now convet midi files? Has Apple decided to simply ignore them?

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and there is a useful tutorial by Nowjobless on YouTube at
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Need Expert's Advice - How to use LabView Efficiently and to increase Readability

My application is fairly complex. It is a real world testing applications that simultaneously controls 16 servo motors running various stress testing routines asynchronously and all at the same time. The application includes queues, state machines, sub VI's, dynamically launched VI's, subpanels, semaphores, XML files, ini files, global variables, shared variables, physical analog and digital interfaces and industrial networking. Just about every technique and trick that LabView 2010 has to offer and the kitchen sink as well.
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Sometimes there are too many wires. Much of my state machines have a dozen or more wires just going from input to output, doing nothing, just because one or two states in the machine need that variable in some state. Yeah, I could spend alot of time bundling and unbundling and rebundling those values, but I don't think that would improve things much.
We have had a long discussion about the use or misuse of Local variables in this forum and I don't want to repeat that here. I use them sparingly where I think it is relatively safe to do so. I also have a bug whenever I try and copy some code that contains one or more local variables. On Pasting the code with local variables, the result is something other than what I expected, I am not sure what. I have to undo the paste and rebuild the code one object at a time.
I am also having trouble using trouble using Variable Property Nodes. When I cut and paste them, they often loose their reference object and I have to go back into the code and redo the Link To on each one. That wastes alot of time and effort.
Creating subVIs is often not appropriate when the code makes many references to objects on the Front Panel. Some simple code will turn into a bunch of object references and dereferences which also tends to take alot of work to clean up and often does not help overall readability in many cases. I use subVIs when appropriate, but because of the interface overhead, not as often as I would like to. My application already has over 150 sub VIs.
The LabView Clean Up Diagram function often works poorly. It leaves way too much empty space between objects, making my diagrams 3 to 4 24" screens wide. That is way too much and difficult to navigate effectively. The Clean Up function puts objects in strange places relative to other objects used nearby. It does a poor job routing wires and often makes deciphering diagrams more difficult rather than easier.
My troubleshooting strategies don't work well for large diagrams and complex applications. The diagrams are so complex that execution highlighting may take 20 minutes for a single pass. Probes help, but breakpoint aren't of much use, because single stepping afterwards often takes you to somewhere else in the same diagram. I can't follow the logic well doing this.
Using structures, I may have Case structures nested 5 to 10 levels deep inside some Event Structure inside a While Loop. Difficult to work with and not very readable.
All and all, I can make it work, but I am not happy about the end result.
I am hoping to benefit from some expert advice from those that are experienced in producing large complex applications efficiently, debugging efficiently and producing readable diagrams that they are proud of.
Can anyone offer their advice on how best to use the LabView features to achieve these results in complex applications? I hope that you can help show me the light.

I'm not an expert but I'm charged out as one at work.
I am off today so I'll share some thoughts that may help or possibly inspire others to chime. I have tried to continually improve my code in those areas and would greatly welcome others sharing their approaches and insights.
Note:
I do refactoring services to help customers with this situation. What I will write does not represent what we do in a code review since our final delverable is a complete final design and that is beyond the scope of this reply.
I'll comment on your points.
dbaechtel wrote:
My application is fairly complex. ...
While watching Olympic figure skating competion slow-motion replays, I learned how the subtleties of how the launching skate is planted while entering a jump can make the difference between a good jump and a bad one.
In software, we plant our foot when we turn from the design to the development. I have to admit that there where a couple of times when I moved from design to development too early and found myself in a situation like you have described.
How to know when design is done?
Waterfall says "cross every 't' and dot every 'i' " while Agile says "code now worry about design latter" and Bottom-up "says "demo working why bother designing" (Please feel free to coment on these over-simplifications gang).
My answer is not much more helpful for those new to LabVIEW.
My design work is done when my design diagrams are more complicated than the LabVIEW diagrm they describe.
dbaechtel wrote:
simultaneously controls 16 servo motors running various stress testing routines asynchronously and all at the same time. The application includes ...and the kitchen sink as well.
Have you posted any design documents you have? These will help greatly in letting us understand your application. More on diagrams latter.
Anytime I see multiple "variations on a theme", I think LVOOP (LabVIEW OOP ) . I'll spare you the LVOOP sales pitch but will testify that once you get your first class cloned off and running as a sibling (or child) you'll appreciate how nice it is to be able to use LVOOP.
Discalimer:
If you don't already have an OOP frame of mind, the learning curve will be steep.
dbaechtel wrote:
Still I am not happy with the productivity that LabVIEW 2010 has provided, nor the readability of my final product.
Sometimes there are too many wires....going from input to output, doing nothing,... spend alot of time bundling and unbundling and rebundling those values, but I don't think that would improve things much.
Full disclaimer:
I used to be of the same opinion and even used performance arguements to make my point. I have since, changed my mind.
Let me illustrate (hopefully). This link (if it works for you, use lefthand pane to navigate hierachy) shows an app I wrote from about 10 years ago when I was in my early days of routing wires. Even the "Main" VI started to suffer from too many wires as this preview from that links shows.
Clustering related data values using Type Definitions is the first method I would would urge. This makes it easier to find the VIs that use the Type def via the browse relationships>>>callers. If I implement my code correctly, any problem I believe is associated with a particualr piece of data that is a Type def has to be in one of the VIs that use that type def therefore easier to maintain.
When I wrote "related data" I am refering data normalization rules (which my wife knows and I picked-up from her and I claim no expertise in this area) where only values that are used together are grouped. E.G. Cluster named File contains "Path" and "Refnum" but not "PhaseOfMoon". This works out nicely with first creating sub-VI since all of the data related to file operations are right there whe I need it and it leads into the next concept ...
When I look at a value in a shift register on the diagram taking up space that is only used in a small sub-set of states, I concider using an Action Engine . This moves the wire from the current diagram into the Action Engine (AE), and cleans up the diagram. The AE brings with it built-in protection so provided I keep all of the opearations related to the the Type def inside the AE I am protected when I start using multiple threads that need at that data (trust me, it may not make a difference now but end users are clever). So that extra wire is effective encapsualted and abstracted away from the diagram you are looking at.
But I said earlier that I would not sell LVOOP so I'll show you what LVOOP based LV apps look like to contrast what I was doing ten years ago in that earlier link. This is what the top level VI looks like.
And this is the Analysis mode of that app.
I suspose I should not mention that LVOOP has wizards that automatically create the sub-VI (accessors) that bundle/unbundle the clusters, should I?
Continuing...
dbaechtel wrote:
We have had a long discussion about the use or misuse of Local variables...I also have a bug whenever I try and copy some code...
If you can simplify the code and duplicat ethe bug. please do so. We can get it logged and fixed.
dbaechtel wrote:
I am also having trouble using trouble using Variable Property Nodes....
That sounds like a usage issue. Posting code to illustrate the process will et us take a shot at figuring out what is happening.
dbaechtel wrote:
Creating subVIs is often not appropriate... My application already has over 150 sub VIs.
"Back in the day..." LV would not even try to create a sub-VI that involved controls/indicators. I use sub-VIs to maintain a common GUI often but I do it on purpose and when I find myself creating a sub-VI that involves a control/indicator, I hit ctrl-z immediately!
I figure a way around it (AE ?) and then do the sub-VI.
Judging by your brief explanation and assuming you do a LVOOP implementation, I would estimate that app need 750-1500 VIs.
dbaechtel wrote:
The LabView Clean Up Diagram function often works poorly....
THe clean-up works fine for how I use it. After throwing together "scratch code" and debugging the "rats nest" I'll hit clean-up as a first step. It guess good enough on simple digrams and in some cases inspires me to structure the diagram in a different way that I may not have thought about. If I don't like, ctrl-z.
Good deisgn and modualr implementaion led to smaller diagrams that just don't need thrre screens.
dbaechtel wrote:
My troubleshooting strategies don't work well for large diagrams and complex applications....Can anyone offer their advice on how best to use the LabView features to achieve these results in complex applications? I hope that you can help show me the light.
Smaller diagrams single step faster since the sub-VI run full speed. I cringe thinking about a 3-screen diagram with multiple probes open ( shivver!).
Re: Nestested structres
Sub-VIs (wink, wink, nudge, nudge)
If it works you have prven the concept is possible. That is the first step in an application.
I hope that gives you some ideas.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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2) dinamically calibrate, so that labview reads the temperature from the tempscan and at the same time knows the colour and derive a curve of calibration (of course we are speaking about a high number of measurements of temperature: 24).
I guess the first method should be straightforwards, since I'm new to LV as well as to this camera I would like to know if you might give me any suggestion how to implement the curve of calibration and pick up the photo. The second method, I think is nice but quite difficult.
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Cheers,
Antonio

Hi Antonio,
We have already spoken on the phone but I thought it would be a good idea to attach the very basic example code on here so that the community can see it.
The code converts a colour into a decimal number. This number can then be used with a look-up table or calibration curve to get the respective temperature signal.
Kind Regards
Michael
NIUK Application Engineer
Attachments:
Colour-to-Number.vi ‏12 KB

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National Instruments

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BR
Patrick

I agree this option would be great to have built in automatically. It might also be nice to allow auto-indixing of 2d (or more) arrays going into for loops where it will iterate through all dimensions an grab the (i,j) single elements and add an i and j index inside the loop, instead of nesting loops inside of each other. I guess these features cater to the power users who want to save any amount of coding possible.
Paul Falkenstein
Coleman Technologies Inc.
CLA, CPI, AIA-Vision
Labview 4.0- 2013, RT, Vision, FPGA

Loading HD video from SonyHC3 and converting to DV..

For the past year l have successfully converted HD to DV on my Sony HC3 and loaded to imovie 06 with ex results. Now when l startup imovie, select a new project then the format as l always have as DV widescreen, DV reverts back to HD 1025 as soon as the Mac sees the camera. l have double checked camera settings and reset/formatted it. The only thing that has changed in the past 2 months was that l tryed to load ilife 08, then read the instructions to find it was not compatible with my emac. thanks
Dave

Thanks again 4 reply, this camera records either in HD or DV, by recording in HD u have a much better quality video. However l do not have an HD tv and dvd's are not HD just SD so HD cameras have a feature to convert the output to SD. This feature has worked well for the last year and we are pleased with the dvd's we have made. The mini dv tapes l keep so that when l win the lotto l'll treat myself to a HD tv and a blueray hd dvd and a new mac to go with them. bye Dave

LabVIEW features and converting to C or C++ codes

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