MATLAB: What is this error: Unexpected MATLAB expression?? andhow can i fix it??

Dear Sir,
I am looking to make radar system by using the chirp generator (to generate chirp signal as sawtooth signal from low to high frequency). I will use the operational amplifier as part of my research work to make amplification to sawtooth signal so I made search in the internet to learn how I can make operational amplifier by the Matlab. After long time, I found something can help me in how i can make inverting amplifier by Matlab circuit where it is nearest to the operational amplifier that I will use in my research work. After I made run to this program by the matlab that I found there is error " Unexpected MATLAB expression". I would like to know "Where is the error in this program to fix it and making changing in some commands in this program to use it in my research work??"
I would like to help me as soon as possible…
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This is the matlab code:
R1=10e3; % resistance, ohms




R2=20e3; % resistance, ohms
R3=20e3; % resistance, ohms
R4=20e3; % resistance, ohms
R5=20e3; % resistance, ohms
% op amp parameter
vsat=15; % saturation voltage,V
% source parameters
M=3; % amplitude, V
f=1000; % frequency, Hz
w=2*pi*f; % frequency, rad/s
theta=(pi/180)*45; % phase angle, rad
tf=2/f; % final time
N=200; % number of increments
t=0:tf/N:tf; % time, s
vs = M*cos(w*t+theta); % input voltage
for k=1:length(vs)
Y=[ 1/R2, 1/R2 + 1/R3 + 1/R4; % nodal admittance matrix
0, -1/R3];
J=[-vs(k)/R1 0 ]; % input current vector
V=J/Y; % node voltage vector
vo(k)=V(2); % record the output voltage
if (vo(k)>vsat) vo(k)=vsat; % check for saturation
elseif (vo(k)<-vsat) vo(k)=-vsat;
end
end
plot(t, vo, t, vs) % plot the transfer characteristic
axis([0 tf -20 20])
xlabel('time, s')
ylabel('vo(t), V')

Best Answer

If you run that, what line does the error occur on? You are likely missing a ')', ']' or '}' or similar.
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