Expected F to be an array with all of the values <= 1e+12.

Hi

My Name is Elias and i am new in Matlab. I m trying to display a graph at 5THz band and i take the message "Expected F to be an array with all of the values <= 1e+12". My program is :

rf = 15.0;

freq = [1:1000]*1e9;

L = rainpl(20000,freq,rf);

loglog(freq/1e19,L)

grid

xlabel('Frequency (GHz)')

ylabel('Attenuation (dB)')