Showing error Matrix dimensions must agree

r=[0 : 100 :100];
theta =[0 : 2*pi :100];
z=2*(r-4*sin(theta)./r);
Matrix dimensions must agree.

Answer 1

[madhan ravi]

theta =0:2*pi:100; 
r=linspace(0,100,numel(theta)); % theta and r should have same length/ or either one be a scalar
z=2*(r-4*sin(theta)./r);
doc linspace
doc numel

Answer 2

[the cyclist]

The variable r has just two elements: [0 100].

theta has 16 elements: [0 6.2832 12.5664 18.8496 ...]

What do you expect to happen when you try to divide a vector with 16 elements by one with 2 elements?