Hello,

I know parabola coordinate and that is z=X^2+Y^2 and I can use polar coordinate too.

Now I want to shift my Parabola PI/4 like what you see in picture please help me to find formula.

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- March 4th 2011, 07:13 AMHamedParabola in Polar Coordinates
Hello,

I know parabola coordinate and that is z=X^2+Y^2 and I can use polar coordinate too.

Now I want to shift my Parabola PI/4 like what you see in picture please help me to find formula. - March 4th 2011, 09:02 AMHallsofIvy
You don't have your axes labeled but that looks like a rotation of radians about the y-axis. Such a rotation can be done by multiplying by the matrix

And, of course, the reverse is just rotating through the negative angle so is multiplying by

That is

So becomes

- March 4th 2011, 09:48 AMHamed
How can I change write this one?

Thanks helpful.

I try to draw it with MATLAB!(Clapping)

new x,y,z is

http://www.mathhelpforum.com/math-he...a4d53c7c6e.png ??