How to explain this diagram ? How to create it ? Can origin do it ?

Discussion in 'Stability' started by sun, Jun 13, 2023.

  1. sun
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    sun Senior Member

    Last edited: Jun 13, 2023
  2. bajansailor
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    bajansailor Marine Surveyor

    Your attachment has disappeared - I just see a big red cross on what should be the attachment.
     
  3. Ad Hoc
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    Ad Hoc Naval Architect

    In the limited data provided, it is basically stating that when encountering seas with a 6.3s period, there is a minor response in pitch.
    However, when encountering seas of 11.0s the response, in pitch, is significantly greater - i.e resonance.
     
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  4. sun
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    sun Senior Member

    Thanks for answering my question, what does the pink or gray block in the picture mean ? What do the horizontal and vertical lines connected to the pink or gray blocks mean ? In general, what do W1, W2, W3 mean ? What software can be used to draw this picture ? Thank you !
     
  5. gonzo
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    gonzo Senior Member

    Is this showing a damped vibrating system?
     
  6. Ad Hoc
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    Ad Hoc Naval Architect

    Oh boy oh boy....you really need to understand some basics maths first.
    Try reading about error bars HERE, for starters.

    As for the rest, get a book on maths and statistics.. as this subject is clearly way above you.
     
  7. gonzo
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    gonzo Senior Member

    I misinterpreted the drawing. Your snooty remark does nothing to give you credibility. It only show a bad attitude.
     
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  8. Ad Hoc
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    Ad Hoc Naval Architect

    If you read my post, you'll realise it is only intended for the Op, as it relates directly to his question.

    You must be somewhat paranoid if you think it is aimed at you....
     
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  9. Alan Cattelliot
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    Alan Cattelliot Senior Member

    Just guesses, based on the title you gave :

    - the pink or gray block may represent a confidence interval of 95%, ie, that there is 95% of chance that, under a wind condition W, the pitch of the boat will be between the two enboxed values.
    - Horizontal lines passing through block centers do not give any informations. They are probably automatically drawn by the plotter
    - Vertical lines could represent the error range of the data.
    - W1 W2 W3 are 3 different wind directions.
    - I use Plotly: Low-Code Data App Development https://plotly.com/ to draw these kind of graphs. Works in python quite well, highly customizable.

    Cheers;
     
  10. Ad Hoc
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    Ad Hoc Naval Architect

    They are a 'measure' of the uncertainty of the data in the horizontal axis.
    Just as are the 'bar's in the vertical axis.
    That's all.. just a graphical way of representing a full set of data...
     
  11. Alan Cattelliot
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    Alan Cattelliot Senior Member

    Well that may be, indeed, the case. But in general, bar plots are used to represent distribution of data points. If it is the case here, the width of the column have no meaning at all. As in this example Candlestick charts in Python https://plotly.com/python/candlestick-charts/: Downbelow, values of quotations are given at given discrete dates. They have all the same width.
    upload_2023-6-15_7-28-32.png
     
  12. Alan Cattelliot
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    Alan Cattelliot Senior Member

    In this rerpresentation , it is possible to represent the sampling rate of data ("horizontal uncertainty") using a variable width, but it is not their common use.
     
  13. Ad Hoc
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    Ad Hoc Naval Architect

    Then you and I have been taught subtly different ways of plotting error bars and what they represent.
    As also noted HERE, it is a measure of uncertainty (like the vertical axis) but horizontally.
     
  14. Alan Cattelliot
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    Alan Cattelliot Senior Member

    Then can you show me in the picture given by Sun the unit of the horizontal axis ?
     

  15. Ad Hoc
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    Ad Hoc Naval Architect

    As noted above:

     
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