Euler-spiral - Mensajes
Why I can not to plot the Euler spiral curvature?
1-10-Euler-spiral.sm (175,21 KiB) descargado 1541 vez(es).

1-10-Euler-spiral.sm (175,21 KiB) descargado 1541 vez(es).

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 KiB) descargado 1510 vez(es).
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 KiB) descargado 1510 vez(es).
Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9
A 2 usuarios les gustó este mensaje
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 KiB) descargado 1598 vez(es).
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 KiB) descargado 1598 vez(es).
Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9
Hi. These are another two options.
1-10-Euler-spiral - option 1.sm (174,84 KiB) descargado 1559 vez(es).
1-10-Euler-spiral - option 2.sm (176,58 KiB) descargado 1547 vez(es).
Best regards.
Alvaro.
1-10-Euler-spiral - option 1.sm (174,84 KiB) descargado 1559 vez(es).
1-10-Euler-spiral - option 2.sm (176,58 KiB) descargado 1547 vez(es).
Best regards.
Alvaro.
A 2 usuarios les gustó este mensaje
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 KiB) descargado 1527 vez(es).
Maths Spirals_ANY.sm (26,77 KiB) descargado 1614 vez(es).
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 KiB) descargado 1532 vez(es).

Best regards.
Alvaro.
1-10-Euler-spiral - option 2.sm (40,6 KiB) descargado 1532 vez(es).

Best regards.
Alvaro.
A 1 usuarios les gustó este mensaje
Valery Ochkov 15/11/2023 12:44:00
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Nice picture. This is a conic helicoid.

HelliCone.sm (148,93 KiB) descargado 1621 vez(es).
Best regards.
Alvaro.

HelliCone.sm (148,93 KiB) descargado 1621 vez(es).
Best regards.
Alvaro.
A 2 usuarios les gustó este mensaje
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 KiB) descargado 1608 vez(es).

knots.sm (272,12 KiB) descargado 1608 vez(es).
Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9
A 1 usuarios les gustó este mensaje
Valery Ochkov 16/11/2023 8:51:00
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