Function from plot

#1 Pubblicato: 06/06/2023 08:19:33

Valery Ochkov

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How can I get a function from this plot?

#2 Pubblicato: 06/06/2023 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 06/06/2023 10:24:00

#3 Pubblicato: 06/06/2023 10:05:20

Brian Runagle

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Does this help?

Graphing.pdf (164,86 KiB) scaricato 1538 volta(e).

Brian

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Valery Ochkov 06/06/2023 10:24:00

#4 Pubblicato: 06/06/2023 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 06/06/2023 10:24:00

#5 Pubblicato: 06/06/2023 12:44:34

Alvaro

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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 06/06/2023 14:16:00, Valery Ochkov 06/06/2023 13:45:00

#6 Pubblicato: 06/06/2023 14:19:52

Jean Giraud

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Wrote
How can I get a function from this plot ?

Hello Valery,
some Smath digitizing utilities
Cheers, Jean.

Digitize Tracer 15.sm (28,83 KiB) scaricato 1389 volta(e).
Digitize OVNI Copy.sm (69,15 KiB) scaricato 1373 volta(e).
Digitize Contour Isocurve Himmelblau Copy.sm (106,67 KiB) scaricato 1436 volta(e).
Digitize Curve.sm (295,86 KiB) scaricato 1363 volta(e).
Digitize Contour.sm (829,05 KiB) scaricato 1448 volta(e).
Digitize Clean_Strip_Smooth.sm (1,76 MiB) scaricato 1485 volta(e).

#7 Pubblicato: 06/06/2023 15:29:30

Jean Giraud

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... this Himmelblau has resident Gray matrix.

Digitize Contour Isocurve Himmelblau Copy.sm (107,19 KiB) scaricato 1438 volta(e).

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Valery Ochkov 07/06/2023 01:02:00

#8 Pubblicato: 06/06/2023 17:11:16

Alvaro

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Hi. Hope this helps.

Modeling a functional curve in a digital image.pdf (860,39 KiB) scaricato 917 volta(e).
Modeling a functional curve in a digital image.sm (1 MiB) scaricato 1501 volta(e).

Best regards.
Alvaro.

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Valery Ochkov 07/06/2023 01:02:00, sergio 07/06/2023 06:34:00, darlbeck 07/06/2023 14:59:00

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Function from plot

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