Jump to content

Search the Community

Showing results for tags 'equation'.



More search options

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


Forums

  • Software & Hardware Discussions
    • LabVIEW General
    • LabVIEW (By Category)
    • Hardware
  • Resources
    • LabVIEW Getting Started
    • OpenG
    • Code Repository (Certified)
    • LAVA Code on LabVIEW Tools Network
    • Code In-Development
  • Community
    • LAVA Lounge
    • LabVIEW Feedback for NI
    • LabVIEW Ecosystem
  • LAVA Site Related
    • Site Feedback & Support
    • Wiki Help

Categories

  • *Uncertified*
  • LabVIEW Tools Network Certified
  • LabVIEW API
    • VI Scripting
    • JKI Right-Click Framework Plugins
    • Quick Drop Plugins
    • XNodes
  • General
  • User Interface
    • X-Controls
  • LabVIEW IDE
    • Custom Probes
  • LabVIEW OOP
  • Database & File IO
  • Machine Vision & Imaging
  • Remote Control, Monitoring and the Internet
  • Hardware

Find results in...

Find results that contain...


Date Created

  • Start

    End


Last Updated

  • Start

    End


Filter by number of...

Joined

  • Start

    End


Group


Personal Website


Company Website


Twitter Name


LinkedIn Profile


Facebook Page


Location


Interests

Found 1 result

  1. A few years ago I wrote my own equation computing algorithm for my company's flagship software. The user will write equations using variable names and constants (for example a=2*b+3), and those equations run continuously every 100ms. The pros The user can add Min and Max expressions inside the equation. For example a=Min(b,c)+2. The syntax supports parenthesis. For example a=3*(b+c). The limitations You can have several operators but their priority is not respected. For example the result of 1+2*3 will be 9 instead of 7. The user has to write 1+(2*3) or 2*3+1 to get the correct result. You can't put an expression inside a "Power" calculation. For example, you can do a+b^c but you can't do a^(b+c). You would need to create a new variable d=b+c and then do a+d, so now you have 2 equations running in parallel all the time instead of 1. There is no support (even though it wouldn't be hard to add) for sin, cos, tan, modulo, square root... I am now thinking of using a built-in LabVIEW feature (or one the community might have created ) in order not to reinvent the wheel completely. Surely I am not the only person who needs to compute equations. I looked at vi.lib\gmath\parser.llb\Eval Formula String.vi and it seems to answer 90% of my needs, it is simple to use, but it doesn't support Min and Max expressions and writing a hybrid system would be complicated. What do people use out there? If I need to reinvent the wheel, I found interesting resources such as https://en.wikipedia.org/wiki/Shunting-yard_algorithm and https://en.wikipedia.org/wiki/Operator-precedence_parser so I think I can pull it off, but it's going to be very time consuming! Cheers
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.