creation of a parabolic curve

[Uni Phil]

Can someone tell me how to create a parabolic curve using eqautions.


Our lecturer has told us one way but hes not sure how to create on!!!!!


Cheers people

 

[Mildfire]

Here's how I would do it. Go to yourcurve creation command or icon, then From Equation, select a csys, choose cartesian, then Pro Table opens.You use the variable t (which returns a value between 0 and 1) to set a range. So ifI want a parabola on the xy plane of formula y=x^2 with a range from x=-4 to x=4, then I couldenter the equation x=4*cos(t*180) on the first line. This sets a range in x from -4 to 4. On the next line enter the formula for the parabola, in this casey=x^2. That's it. Close the window, hit OK. Just customize the range and formula to your needs. Hope that helps.

 

[Uni Phil]

cheers for that, it worked a treat. Tried telling my lecturer but he was having none of it!!!!

 

[Uni Phil]

I have another question about the creation of the parabola now though. I am albe to create the parabola with no problems at all, but it always creates the parabola at the CSYS. What do I have to do to relocate the parabola.


Cheers





Phil

 

[bem]

modify the equation to add the offset difference


add a constant to translate (ie y=x^2+c where c is the offset difference)


Add anlinear term to rotate (ie y=x^2+2x +2 --> translation & rotation)


refer to any text on analytical geometry
Edited by: bem