Error using / matrix dimensions must agree

Hi everybody, I am very new to matlab. And trying to write a code for my class project. Thus, I can not find where the problem is. As I stated, I am very new and the mistake might be very stupid or very big but it shouldn't take that long. I need to compute time as a function of t00 and plot them with respect to t00 values.

function [ evapt ] = tevap( t00 )
t00=400:10:1200;
evapt=zeros(1, length(t00));
lamcp=0.2*(10^-4);
cp=1.5;
d0=6*(10^-5);
dtc=1800;
tb=473;
rhol=800;
dhv=2200;
B=(cp*(dtc+t00-tb))/dhv;
beta=(8*lamcp*B)/(rhol*cp);
for i=length(t00)
    evapt(i)=(d0^2)/beta;

end
end

Answer 1

[Walter Roberson]

for i = 1 : length(t00)
  evapt(i)=(d0^2)./beta(i);
end

Or better, no loop and

evapt = (d0^2)./beta;