Linear interpolation

Anonymous
2013-03-16
2021-03-04
  • Anonymous - 2013-03-16

    Originally created by: H87

    Hi
    Annyone here know a good algorithm for linear interpolation. I know that oscat lib can provide a block that can do that. But i need the algorithm, so i can make a block my self. I need that bacause i'm making a PID regulator with a gain-scheduling option.

    I'm programming the PID in Codesys structured text.

    Best Regards
    Henrik

     
  • shooter

    shooter - 2013-03-19

    if you open the oscat.lib in your codesys as a library, you can see the source code complete it is open source.

    easier way is download the txt version. and the pdf along.

    If you tell us what you want, we will look into your problem.

    btw if it is complicated you can always use fuzzy.

     
  • shooter

    shooter - 2013-04-03

    ymax/ymin*((value-xmin)/xmax-xmin)+ymin

     
    • laruso

      laruso - 2021-03-04

      I'm pretty sure that the formula should be:
      (ymax-ymin)/(xmax-xmin)*(value-xmin)+ymin

      For me the formula worked perfectly and is used to interpolate values for special needs, w/o using the function from the OSCAT library called LINEAR_INT.

       
  • laruso

    laruso - 2021-03-04

    I'm pretty sure that the formula should be:
    (ymax-ymin)/(xmax-xmin)*(value-xmin)+ymin

    For me the formula worked perfectly and is used to interpolate values for special needs, w/o using the function from the OSCAT library called LINEAR_INT.

     

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