How do you properly type 1/e^x in matlab?

So I'm trying to get this formula to work but it seems the division before the e is causing issues, I've tried everthing I could think of but nothing clicks, is there any way to get 1/e^x to work in matlab?

clc
    c=3*10^8; %speed of light (m/s)
    h=6.626*10^-23; %Planck constant (J-s)
    k=1.38*10^-23; %Boltzmann constant (J/K)
    l=(0.1:0.1:3); %wavelength
    t1=3000; % temperature (K)
        R=((2*pi*c^2*h)./l).*(1/(exp((h*c)/(l.*k*t1))-1))

Error using /
Matrix dimensions must agree.

Answer 1

[VBBV]

clc
  c=3*10^8; %speed of light (m/s)
  h=6.626*10^-23; %Planck constant (J-s)
  k=1.38*10^-23; %Boltzmann constant (J/K)
  l=(0.1:0.1:3); %wavelength
  t1=3000; % temperature (K)
      R=((2*pi*c^2*h)./l).*(1./(exp((h*c)./(l.*k*t1))-1))

Use element wise division

Answer 2

[Walter Roberson]

For 1/e^x you could use 1./exp(x) but more often it is better to use exp(-x)