How to reolve this error? Matrix dimensions should agree..!

theta=0:0.01:2*pi;
r1=3/cos(theta);//getting error here "Error using / Matrix dimensions must agree"
r2=-4/sin(theta);//getting error here "Error using / Matrix dimensions must agree"
polarplot(theta,r1);hold on;
polarplot(theta,r2);

Answer 1

[James Tursa]

Use element-wise operator ./ instead of the matrix operator /

r1=3./cos(theta);
r2=-4./sin(theta);