Equation 2d curve help!!!!

[dalsip]

Could some please help with a Fermat spiral

 

[Israr]

What is "Fermat spiral"?


Israr

 

[dalsip]

What I need is help on how to set up the equation so as to drive a curve. Thanks!!





[url]http://www-groups.dcs.st-and.ac.uk/~history/Curves/Fermats.h tml[/url]

 

[puppet]

/* For cylindrical coordinate system, enter parametric equation

/* in terms of t (which will vary from 0 to 1) for r, theta and z

/* For example: for a circle in x-y plane, centered at origin

/* and radius = 4, the parametric equations will be:

/*&n bsp; r = 4

/* theta = t * 360

/*&n bsp; z = 0

/*-------------------------------------------------------- -----------



theta = t*360*40

r = theta^.5

z = 0





40 is the amount of circles .. the rest is from that guys equation

hope this helps.

View attachment 751

 

[puppet]

u can use edit->copy->rotate and make the other 1/2 of the equation/.



u can also add depth to it by adding somethign to the z-value of the equation

ie

z= t*5 (so it will go up 5 units) View attachment 752







this is a good web page for it

http://mathworld.wolfram.com/ArchimedeanSpiral.html







Edited by: puppet

 

[dalsip]

Thanks guys your are my hero(s)!!!!!!!!!!