Function from plot

#1 Posted: 2023/6/6 08:19:33

Valery Ochkov

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How can I get a function from this plot?

#2 Posted: 2023/6/6 08:59:59

Jean Giraud

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Wrote
How can I get a function from this plot ?

1. Probably from the expensive digitizer suggested by Richard [Mathsoft Collaboratory]
2. Piecewise from Tracer.
3. Try Mathsoft digitizer.
4. Smath difficult
At this point from the collected data set, fit a model function.
Cheers ... Jean.

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Valery Ochkov 2023/6/6 10:24:00

#3 Posted: 2023/6/6 10:05:20

Brian Runagle

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Does this help?

Graphing.pdf (164.86 KiB) downloaded 749 time(s).

Brian

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Valery Ochkov 2023/6/6 10:24:00

#4 Posted: 2023/6/6 10:15:02

⚜ Kenny Lemens, P.E. ᵂᴵ

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Greetings,

Wrote
How can I get a function from this plot? 🖼

That is a straight line on a semi-log graph; you can reference this handout: https://inside.mines.edu/~epoeter/_GW/LAB/EquationsOfStraightLinesOnDifferentTypesGraphPaper.pdf

Per this handout, your equation should be

y = b + m*log(x)

where:

m = difference in y over one log cycle of x
b = y value corresponding to x=1

May this be of Good Help;
⚜ Kenny Lemens, P.E. ᵂᴵ

"No matter where you go, there you are." -Buckaroo BanzaiHotkeys: https://en.smath.com/forum/resource.ashx?a=45771&b=2

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Valery Ochkov 2023/6/6 10:24:00

#5 Posted: 2023/6/6 12:44:34

Alvaro

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How can I get a function from this plot?

Hi. You can try this post Approximation of a functional curve in a digital image or this other one: Embedding images into a plot

Best regards.
Alvaro.

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Вячеслав Мезенцев 2023/6/6 14:16:00, Valery Ochkov 2023/6/6 13:45:00

#6 Posted: 2023/6/6 14:19:52

Jean Giraud

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How can I get a function from this plot ?

Hello Valery,
some Smath digitizing utilities
Cheers, Jean.

Digitize Tracer 15.sm (28.83 KiB) downloaded 753 time(s).
Digitize OVNI Copy.sm (69.15 KiB) downloaded 767 time(s).
Digitize Contour Isocurve Himmelblau Copy.sm (106.67 KiB) downloaded 768 time(s).
Digitize Curve.sm (295.86 KiB) downloaded 759 time(s).
Digitize Contour.sm (829.05 KiB) downloaded 772 time(s).
Digitize Clean_Strip_Smooth.sm (1.76 MiB) downloaded 743 time(s).

#7 Posted: 2023/6/6 15:29:30

Jean Giraud

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... this Himmelblau has resident Gray matrix.

Digitize Contour Isocurve Himmelblau Copy.sm (107.19 KiB) downloaded 755 time(s).

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Valery Ochkov 2023/6/7 01:02:00

#8 Posted: 2023/6/6 17:11:16

Alvaro

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Hi. Hope this helps.

Modeling a functional curve in a digital image.pdf (860.39 KiB) downloaded 443 time(s).
Modeling a functional curve in a digital image.sm (1 MiB) downloaded 791 time(s).

Best regards.
Alvaro.

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Valery Ochkov 2023/6/7 01:02:00, sergio 2023/6/7 06:34:00, darlbeck 2023/6/7 14:59:00

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Function from plot

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