Rotating an ellipse in matlab

[dneda]

So I have a two part assignment, the first part is to plot the ellipse for

a) (x^2/9)+(y^2/4) = 1

I think I did this right as when i do plot (x,y) it displays an ellipse

b) draw the ellipse obtained by rotating (x^2/9)+(y^2/4) = 1 30 degrees
counterclockwise.cheap autocad
I can't for the life of me find a rotate command. I was hoping I could just rotate the plot I got from part a but there is no command to do that. anyone have ideas?

 

[microKernel]

If it is an assignment, then if you just rotate the plot, not doing the calculation, you'll definitely get zero
Anyways...

If you understand why did you get the correct result for you part a, then part b is simple.
You just need to convert you angle to radians (Remember pi radian = 180 degrees) and calculate the rotation matrix (i.e. [cos θ, -sinθ; sinθ, cosθ]).Then you'll simply do matrix multiplication of your original matrix (for x,y points) with this rotation matrix.

Result can be plot like you did in a.