Vector

Im trying to convert a vector O in radian into x-coordinate vector and y-coordinate vector but Im encountering the problem below.

??? Error using ==> mpower Inputs must be a scalar and a square matrix.

Error in ==> Untitled4 at 22 r=[(a*b)/sqrt((b*cos(O))^2+(a*sin(O))^2)]; % ellipse in polar coordinates

    npanels=3;
    a=1.25; %major axis
    b=0.75; %minor axis
    O=[pi-pi/(2*npanels):-pi/(npanels):pi/(2*npanels)]; %boundary points in radian
    r=[(a*b)/sqrt((b*cos(O))^2+(a*sin(O))^2)]; % ellipse in polar coordinates
    x=rcos(O); %x-coordinate
    y=rsin(O); %y-coordinate

Answer 1

[Paulo Silva]

.^ instead of ^

Answer 2

[Walter Roberson]

r=(a*b)/sqrt((b*cos(O)).^2+(a*sin(O)).^2);

Answer 3

[Yoon Hong Ng]

Now Im having this trouble but i only have 1 matrix

??? Error using ==> mldivide Matrix dimensions must agree.

Error in ==> Untitled4 at 22 r=(a*b)/sqrt((b*cos(O)).^2+(a*sin(O)).^2); % ellipse in polar coordinates

[Paulo Silva]

same thing add a dot before the operation mentioned on the error

./ instead of /

[Yoon Hong Ng]

Thank you everyone. It is working now.