Function from plot

#1 Posted: 6/6/2023 8:19:33 AM

Valery Ochkov

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How can I get a function from this plot?

#2 Posted: 6/6/2023 8:59:59 AM

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 6/6/2023 10:24:00 AM

#3 Posted: 6/6/2023 10:05:20 AM

Brian Runagle

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Does this help?

Graphing.pdf (164 KiB) downloaded 334 time(s).

Brian

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Valery Ochkov 6/6/2023 10:24:00 AM

#4 Posted: 6/6/2023 10:15:02 AM

⚜ 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 6/6/2023 10:24:00 AM

#5 Posted: 6/6/2023 12:44:34 PM

Alvaro Diaz Falconi

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Wrote
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 6/6/2023 2:16:00 PM, Valery Ochkov 6/6/2023 1:45:00 PM

#6 Posted: 6/6/2023 2:19:52 PM

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 KiB) downloaded 215 time(s).
Digitize OVNI Copy.sm (69 KiB) downloaded 214 time(s).
Digitize Contour Isocurve Himmelblau Copy.sm (106 KiB) downloaded 208 time(s).
Digitize Curve.sm (295 KiB) downloaded 215 time(s).
Digitize Contour.sm (829 KiB) downloaded 216 time(s).
Digitize Clean_Strip_Smooth.sm (1 MiB) downloaded 213 time(s).

#7 Posted: 6/6/2023 3:29:30 PM

Jean Giraud

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... this Himmelblau has resident Gray matrix.

Digitize Contour Isocurve Himmelblau Copy.sm (107 KiB) downloaded 216 time(s).

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Valery Ochkov 6/7/2023 1:02:00 AM

#8 Posted: 6/6/2023 5:11:16 PM

Alvaro Diaz Falconi

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Hi. Hope this helps.