# Thread: how to get the vectoric representation..

1. ## how to get the vectoric representation..

i have this ellipse formula and i cant see how they got it to be represented in
sch vectoric way
by what method?
formula?
http://i28.tinypic.com/zlzr04.gif

2. Originally Posted by transgalactic
i have this ellipse formula and i cant see how they got it to be represented in sch vectoric wayby what method? formula?
I am not sure how to begin an answer.
I think you just have to have studied parametric representations.
That topic is standard in almost all calculus courses.

$\displaystyle \frac{{x^2 }}{{a^2 }} + \frac{{y^2 }}{{b^2 }} = 1\; \leftrightarrow \;\left( {a\cos (t),b\sin (t)} \right)$

3. i know parametric representation
there is no vector in my formula

so it cant cant be transformed into a vector formula

4. Originally Posted by transgalactic
i know parametric representation
there is no vector in my formula

so it cant cant be transformed into a vector formula
Do you understand what a "vector formula" is? If you know that x= f(t) and y= g(t) then $\displaystyle \vec{r}(t)= f(t)\vec{i}+ g(t)\vec{j}$ is a vector equation for the curve/

5. yes but my original formula is not vectoric

we cant make it a vectoric
if its not defined as one from the begining