Plot function not working

if true
  % code
%to generate all different waveforms
clc;
a=5;b=6;c=7;d=8;
t=0:0.01:1;
f=2;
r=0;
w=2.*pi.*f;
alpha=50;
beta=70;
m=0.5;
k=1;
X=a*sin(w*t+r);
Y=c*cos(w*t+r);
Z=c*square(w*t,alpha);
T=d*square(w*t,beta);
U=d*sawtooth(w*t,m);
N=d*sawtooth(w*t,k);
figure;
subplot(321);
plot(t,X) *bold*
title('continuous sine waveform')
xlabel('time');
ylabel('amplitude');
subplot(322);
stem(t,Y);
title('continuous cosine waveform');
xlabel('time');
ylabel('amplitude');
subplot(323);
stem(t,Z);
title('continuous square waveform');
xlabel('time');
ylabel('amplitude');
subplot(324);
stem(t,T);
title('continuous rectangular waveform');
xlabel('time');
ylabel('amplitude');
subplot(325);
stem(t,U);
title('continuous triangular waveform');
xlabel('time');
ylabel('amplitude');
subplot(326);
stem(t,N);
title('sawtooth waveform');
xlabel('time');
ylabel('amplitude');
end

Answer 1

[KSSV]

It is working fine. Copy and run like shown below:

%to generate all different waveforms 
clc; 
a=5;b=6;c=7;d=8; 
t=0:0.01:1; 
f=2; r=0; 
w=2.*pi.*f; 
alpha=50; 
beta=70; m=0.5; k=1; 
X=a*sin(w*t+r); 
Y=c*cos(w*t+r); 
Z=c*square(w*t,alpha); 
T=d*square(w*t,beta); 
U=d*sawtooth(w*t,m);
N=d*sawtooth(w*t,k); 
figure; 
subplot(321);
plot(t,X)
title('continuous sine waveform')
xlabel('time');
ylabel('amplitude'); 
subplot(322); 
stem(t,Y); 
title('continuous cosine waveform');
xlabel('time'); 
ylabel('amplitude'); 
subplot(323); 
stem(t,Z); 
title('continuous square waveform');
xlabel('time'); 
ylabel('amplitude'); 
subplot(324); 
stem(t,T); 
title('continuous rectangular waveform'); 
xlabel('time'); 
ylabel('amplitude'); 
subplot(325);
stem(t,U); 
title('continuous triangular waveform'); 
xlabel('time'); 
ylabel('amplitude'); 
subplot(326);
stem(t,N); 
title('sawtooth waveform');
xlabel('time'); 
ylabel('amplitude');