Problem Drawing Independent Variable Axis & Grid

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Gentlemen:

The code below is a portion of an Octave m-file for the solution of a 2nd
order ODE. The solution is generated just fine, but the graphical output is
not working entirely correctly. In figure(1), the time axis is correctly
drawn, but if I activate the similar commands to draw the time axis in
either of the subplots under figure(2), the main curve is removed. Also,
the grid is not present in the upper subplot, despite the fact that grid on
is active.   Is this a bug, or an error on my part? Can you give me a fix,
please? Thanks,

Sam


figure(1); clf; hold on; grid on  % two normalized curves
plot(t,x1/x1mx,'k-',"LineWidth",2,t,x2/x2mx,'r-')
plot([0 tmx],[0 0],'k',"LineWidth",1)   % draw t-axis
xlabel("time, t sec")
title("Normalized Response Curves","fontsize",20)

figure(2);   % using two subplots
hold on;  grid on
subplot(2, 1, 1);  % two rows, one column, first row
plot(t, x1,'k',"LineWidth",2);
%plot([0 tmx],[0 0],'k',"LineWidth",1)   % draw t-axis   WIPES OUT THE MAIN
CURVE
xlabel("t (sec)");
ylabel("x(t)")
title("Solution Curve, x(t)","fontsize",20);

subplot(2, 1, 2);  % two rows, one column, second row
grid on   % THIS DOES NOT SEEM TO WORK!!!!
plot(t, x2,'k',"LineWidth",2);
%plot([0 tmx],[0 0],'k',"LineWidth",1)   % draw t-axis  WIPES OUT THE MAIN
CURVE
xlabel("t (sec)");
ylabel("xdot(t)");
title("First Derivative, xdot(t)","fontsize",20);

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:large"><br></div><div class=3D"gmail_default" st=
yle=3D"font-family:comic sans ms,sans-serif;font-size:large">Gentlemen:</di=
v><div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-seri=
f;font-size:large"><br></div><div class=3D"gmail_default" style=3D"font-fam=
ily:comic sans ms,sans-serif;font-size:large">The code below is a portion o=
f an Octave m-file for the solution of a 2nd order ODE. The solution is gen=
erated just fine, but the graphical output is not working entirely correctl=
y. In figure(1), the time axis is correctly drawn, but if I activate the si=
milar commands to draw the time axis in either of the subplots under figure=
(2), the main curve is removed. Also, the grid is not present in the upper =
subplot, despite the fact that grid on is active.=C2=A0=C2=A0 Is this a bug=
, or an error on my part? Can you give me a fix, please? Thanks,</div><div =
class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-=
size:large"><br></div><div class=3D"gmail_default" style=3D"font-family:com=
ic sans ms,sans-serif;font-size:large">Sam</div><div class=3D"gmail_default=
" style=3D"font-family:comic sans ms,sans-serif;font-size:large"><br></div>=
<div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;=
font-size:large"><br></div><div class=3D"gmail_default" style=3D"font-famil=
y:comic sans ms,sans-serif;font-size:large">figure(1); clf; hold on; grid o=
n =C2=A0% two normalized curves<br>plot(t,x1/x1mx,&#39;k-&#39;,&quot;LineWi=
dth&quot;,2,t,x2/x2mx,&#39;r-&#39;)<br>plot([0 tmx],[0 0],&#39;k&#39;,&quot=
;LineWidth&quot;,1) =C2=A0 % draw t-axis<br>xlabel(&quot;time, t sec&quot;)=
<br>title(&quot;Normalized Response Curves&quot;,&quot;fontsize&quot;,20)<b=
r><br>figure(2); =C2=A0 % using two subplots<br>hold on; =C2=A0grid on<br>s=
ubplot(2, 1, 1); =C2=A0% two rows, one column, first row<br>plot(t, x1,&#39=
;k&#39;,&quot;LineWidth&quot;,2);<br>%plot([0 tmx],[0 0],&#39;k&#39;,&quot;=
LineWidth&quot;,1) =C2=A0 % draw t-axis =C2=A0 WIPES OUT THE MAIN CURVE<br>=
xlabel(&quot;t (sec)&quot;);<br>ylabel(&quot;x(t)&quot;)<br>title(&quot;Sol=
ution Curve, x(t)&quot;,&quot;fontsize&quot;,20);<br><br>subplot(2, 1, 2); =
=C2=A0% two rows, one column, second row<br>grid on =C2=A0 % THIS DOES NOT =
SEEM TO WORK!!!!<br>plot(t, x2,&#39;k&#39;,&quot;LineWidth&quot;,2);<br>%pl=
ot([0 tmx],[0 0],&#39;k&#39;,&quot;LineWidth&quot;,1) =C2=A0 % draw t-axis =
=C2=A0WIPES OUT THE MAIN CURVE<br>xlabel(&quot;t (sec)&quot;);<br>ylabel(&q=
uot;xdot(t)&quot;);<br>title(&quot;First Derivative, xdot(t)&quot;,&quot;fo=
ntsize&quot;,20);</div></div>

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