MATLAB: Ploting a function handle

error in @(f)(txpower-pl_db)error in essaie (line 23) plot(fMATLABpr_dbm(f))

can someone help me out please. I'm trying to plot this code but it gives me some errors ı don't know how to solve. It's my first time to use handle function.
close all;
clear variables;
clc;
f =1:0.1:28;
SF=4.0;
d0=1;
c = 3e8;
h_BS = 15;
TRDistance= 20;
h_BS = 15;
TRDistance= 20;
TXPower=30;
lambda = @(f) (c/(f*1e9));
PL_dB = @(f)(20*log(4*pi*d0*f*1e9/c) + 23.1*(1-0.03*((h_BS-35)/35))*log((TRDistance)) + SF*randn);
Pr_dBm =@(f)( TXPower - PL_dB);
figure;
plot(f, Pr_dBm(f));
xlabel('f');
ylabel('Pr_dBm');

Best Answer

 SF=4.0;
 d0=1;
 c = 3e8;
 h_BS = 15;
 TRDistance= 20;
 TXPower=30;
 lambda = @(f) (c/(f*1e9));
 PL_dB = @(f)(20*log(4*pi*d0*f*1e9/c) + 23.1*(1-0.03*((h_BS-35)/35))*log((TRDistance)) + SF*randn);
 Pr_dBm =@(f) TXPower - PL_dB(f);
 figure(1)
 fplot(Pr_dBm, [1,28])
 xlabel('f')
 ylabel('Pr_dBm')
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