I try this;
load('VEPdata1.mat');
Fs=2000;%Sampling frequency
Ts=1/Fs;%Sampling period
t=0:Ts:10;
plot(t);
title('10s of EEG data');
xlabel('time(s)');
ylabel('amplitude(microA)');
hLen=1;
t_h=0:Ts:1
stem(t_h);
title('Stimulus filter sequence');
xlabel('time(s)');
ylabel('amplitude(microA)');
Nr=hLen;
