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Euler-spiral - Сообщения
Why I can not to plot the Euler spiral curvature?
1-10-Euler-spiral.sm (175,21 КиБ) скачан 289 раз(а).

1-10-Euler-spiral.sm (175,21 КиБ) скачан 289 раз(а).

SMath native integration is a purely numerical procedure. Derivatives are symbolic ones. You would need to replace the symbolic derivatives by approximations.
Maxima can handle the derivatives. Funny enough, Maxima can't display the integral values x(t), y(t), neither can it plot them.
But you just asked for the curvature

Euler-spiral_Maxima.sm (28,89 КиБ) скачан 298 раз(а).
Maxima can handle the derivatives. Funny enough, Maxima can't display the integral values x(t), y(t), neither can it plot them.
But you just asked for the curvature


Euler-spiral_Maxima.sm (28,89 КиБ) скачан 298 раз(а).
Martin KraskaPre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx
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Thanks, Martin.
No solution in pure SMath?
No solution in pure SMath?
Here is a solution in pure (AKA Maxima-free) SMath.
The derivatives are replaced by difference quotients with a fixed perturbation h. Sooner or later this h is too big for a precise approximation, therefore, the value of the curvature deteriorates for large values of t.
Perhaps the fixed interval integrator also is to be blamed for the loss of precision.
Another M to patent?

Euler-spiral_Kr.sm (15,13 КиБ) скачан 295 раз(а).
The derivatives are replaced by difference quotients with a fixed perturbation h. Sooner or later this h is too big for a precise approximation, therefore, the value of the curvature deteriorates for large values of t.
Perhaps the fixed interval integrator also is to be blamed for the loss of precision.
Another M to patent?

Euler-spiral_Kr.sm (15,13 КиБ) скачан 295 раз(а).
Martin KraskaPre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx
Hi. These are another two options.
1-10-Euler-spiral - option 1.sm (174,84 КиБ) скачан 311 раз(а).
1-10-Euler-spiral - option 2.sm (176,58 КиБ) скачан 309 раз(а).
Best regards.
Alvaro.
1-10-Euler-spiral - option 1.sm (174,84 КиБ) скачан 311 раз(а).
1-10-Euler-spiral - option 2.sm (176,58 КиБ) скачан 309 раз(а).
Best regards.
Alvaro.
2 пользователям понравился этот пост
https://community.ptc.com/t5/Mathcad/Euler-spiral/m-p/912205/thread-id/209391
WroteWhy I can not to plot the Euler spiral curvature ?
Cornu = Euler = Fresnel = Clothoid ... all same.
Maths Spirals Euler-Cornu.sm (17,51 КиБ) скачан 314 раз(а).
Maths Spirals_ANY.sm (26,77 КиБ) скачан 299 раз(а).
WroteCornu = Euler = Fresnel = Clothoid ... all same.
In the document ANY spiral ... set
c:= 0.30634896253
k:= -0.848622607416
r:= 0.25 ... immaterial, just to plot on same canvas.
You will have the Golden spiral considered Fibonacci.
Cheers ... Jean.
Hi. Using the numerical limit procedure from this post
1-10-Euler-spiral - option 2.sm (40,6 КиБ) скачан 301 раз(а).

Best regards.
Alvaro.
1-10-Euler-spiral - option 2.sm (40,6 КиБ) скачан 301 раз(а).

Best regards.
Alvaro.
1 пользователям понравился этот пост
Valery Ochkov 15.11.2023 12:44:00
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Nice picture. This is a conic helicoid.

HelliCone.sm (148,93 КиБ) скачан 295 раз(а).
Best regards.
Alvaro.

HelliCone.sm (148,93 КиБ) скачан 295 раз(а).
Best regards.
Alvaro.
2 пользователям понравился этот пост
The plots are interactive (drag to rotate, Ctrl-Mousewheel to zoom). Yet, they are not really performant, takes approx. 3 seconds to update.

knots.sm (272,12 КиБ) скачан 311 раз(а).

knots.sm (272,12 КиБ) скачан 311 раз(а).
Martin KraskaPre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx
1 пользователям понравился этот пост
Valery Ochkov 16.11.2023 08:51:00
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