FindRoot vs. solve(2) or (4)

FindRoot vs. solve(2) or (4) - Fundamental understanding of both functions - Messaggi

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#1 Pubblicato: 12/04/2018 14:12:23

Ruben Sidranski

17 apprezzamenti in 465 post.

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Having an issue understanding where to use what ...
FindRoot vs solve(4).sm (4,04 KiB) scaricato 1195 volta(e).

#2 Pubblicato: 12/04/2018 14:37:10

Davide Carpi

1.443 apprezzamenti in 2.936 post.

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FindRoot needs an initial guess to be explicited, therefore as 2nd argument use 1 or whatever number is more appropriate.

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#3 Pubblicato: 12/04/2018 14:54:19

Ruben Sidranski

17 apprezzamenti in 465 post.

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Thank you Davide,
Can you post how to do the initial guess? I've tried multiple items with no success

#4 Pubblicato: 12/04/2018 15:22:42

Davide Carpi

1.443 apprezzamenti in 2.936 post.

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Wrote
Thank you Davide,
Can you post how to do the initial guess? I've tried multiple items with no success

Here you have

2018-04-12 20_19_55-SMath Studio - [FindRoot vs solve(4).sm].png

FindRoot vs solve(4).sm (4,43 KiB) scaricato 1236 volta(e).

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1 utenti hanno apprezzato questo post

ElSid 12/04/2018 17:14:00

#5 Pubblicato: 12/04/2018 17:16:08

Ruben Sidranski

17 apprezzamenti in 465 post.

Gruppo: User

Davide,
User error! I was initializing with #c instead of #a or #b.

#6 Pubblicato: 12/04/2018 20:30:49

Jean Giraud

983 apprezzamenti in 6.866 post.

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Wrote
Having an issue understanding where to use what ...

1. roots is local of utmost accuracy.
2. solve[4] is general on specified range.
... will find/locate all 0's of Bessel in specified range
... roots [individually located] will meet Abramowitz & Stegun

roots and find work around different numerical algorithms.

You must have valid example(s) for Doctoring.
"Samples" is immensely furbished.

Solve roots.sm (16,13 KiB) scaricato 1195 volta(e).

#7 Pubblicato: 12/04/2018 21:37:07

Jean Giraud

983 apprezzamenti in 6.866 post.

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This one is of great interest too.

Solve Algebraic.sm (46,06 KiB) scaricato 1236 volta(e).

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FindRoot vs. solve(2) or (4) - Fundamental understanding of both functions - Messaggi