having looked at the circuit, i first wanted to start my frequency from 0 and plot for 10000 to 20000. so in matlab i used f = 0:10000:20000; but the equation for frequency is f= 1/sqrt(2*pi*L1*C3). I wanted to know if it would make sense for me to use the formula in a subset called f0? and then use f0 because f is already defined?