updated the code

4 files changed, 117 insertions, 102 deletions

diff --git a/1592/CH9/EX9.11/example_9_11.sce b/1592/CH9/EX9.11/example_9_11.sce
index cb72453e8..51fb4d676 100755
--- a/1592/CH9/EX9.11/example_9_11.sce
+++ b/1592/CH9/EX9.11/example_9_11.sce
@@ -1,25 +1,30 @@
-//Scilab Code for Example 9.11 of Signals and systems by

-//P.Ramakrishna Rao

-//Power Spectral Density 

-clear;

-clc;

-clear f n;

-fo=2;

-n=1;

-RC=1/(2*%pi*10^3);

-w=4*%pi*10^3

-H=1/(1+%i*w*RC);

-disp(H,'H(f)');

-X=(abs(H))^2;

-for f=-5:5

-    Pxx(n)=25*[delta(f-fo)+delta(f+fo)];

-    Pyy(n)=X*Pxx(n);

-    n=n+1;

-end

-disp(Pxx,'Pxx=');

-disp(Pyy,'Pyy=');

-f=-5:5;

-plot2d3(f,Pyy,-2);

-title('Power Spectral Density');

-ylabel('Pyy(f)');

-xlabel('f in Hz');

+//Scilab Code for Example 9.11 of Signals and systems by
+//P.Ramakrishna Rao
+//Power Spectral Density 
+clear;
+clc;
+function [y]=delta(t)
+    if t==0
+    y=1
+else y=0
+    end
+endfunction
+fo=2;
+n=1;
+RC=1/(2*%pi*10^3);
+w=4*%pi*10^3
+H=1/(1+%i*w*RC);
+disp(H,'H(f)');
+X=(abs(H))^2;
+for f=-5:5
+    Pxx(n)=25*[delta(f-fo)+delta(f+fo)];
+    Pyy(n)=X*Pxx(n);
+    n=n+1;
+end
+disp(Pxx,'Pxx=');
+disp(Pyy,'Pyy=');
+f=-5:5;
+plot2d3(f,Pyy,-2);
+title('Power Spectral Density');
+ylabel('Pyy(f)');
+xlabel('f in Hz');
\ No newline at end of file
diff --git a/1592/CH9/EX9.3/example_9_3.sce b/1592/CH9/EX9.3/example_9_3.sce
index 9d6385185..bf4e494b9 100755
--- a/1592/CH9/EX9.3/example_9_3.sce
+++ b/1592/CH9/EX9.3/example_9_3.sce
@@ -1,23 +1,29 @@
-//Scilab Code for Example 9.3 of Signals and systems by

-//P.Ramakrishna Rao

-//Convolution of two signals

-clc;

-clear;

-n=1;

-for t=-5:0.1:5

-    x(n)=-2*u(t-0.5)+2*u(t-1.5);

-    y(n)=(t+1)*u(t+1)-(t+1)*u(t-2);

-    n=n+1;

-end

-z=conv(x,y);

-t=-5:0.1:5;

-plot2d2(t,x,5);

-title('x(t)');

-figure(1);

-t=-5:0.1:5;

-plot2d(t,y,2);

-title('y(t)');

-figure(2);

-t=-10:0.1:10;

-plot2d(t,z,6);

-title('Convolution');

+//Scilab Code for Example 9.3 of Signals and systems by
+//P.Ramakrishna Rao
+//Convolution of two signals
+clc;
+clear;
+function [y]=u(t)
+    if t>=0
+    y=1
+else y=0
+    end
+endfunction
+n=1;
+for t=-5:0.1:5
+    x(n)=-2*u(t-0.5)+2*u(t-1.5);
+    y(n)=(t+1)*u(t+1)-(t+1)*u(t-2);
+    n=n+1;
+end
+z=conv(x,y);
+t=-5:0.1:5;
+plot2d2(t,x,5);
+title('x(t)');
+figure(1);
+t=-5:0.1:5;
+plot2d(t,y,2);
+title('y(t)');
+figure(2);
+t=-10:0.1:10;
+plot2d(t,z,6);
+title('Convolution');
\ No newline at end of file
diff --git a/1592/CH9/EX9.5/example_9_5.sce b/1592/CH9/EX9.5/example_9_5.sce
index 4e148ec35..7919c5b59 100755
--- a/1592/CH9/EX9.5/example_9_5.sce
+++ b/1592/CH9/EX9.5/example_9_5.sce
@@ -1,28 +1,33 @@
-//Scilab Code for Example 9.5 of Signals and systems by

-//P.Ramakrishna Rao

-clc;

-clear;

-clear z x y t T;

-n=1;

-for t=-10:0.01:10;

-    x(n)=exp(-t)*u(t);

-    n=n+1;

-end

-t=-10:0.01:10;

-plot(t,x);

-title('x(t)');

-n=1;

-for T=-10:0.1:0;

-    z(n)=integrate('exp(-t)*exp(T-t)','t',0,1000);

-    n=n+1;

-end

-n=1;

-for T=0.1:0.1:10;

-    z(n+101)=integrate('exp(-t)*exp(T-t)','t',T,1000);

-    n=n+1;

-end

-figure(1);

-T=-10:0.1:10;

-plot(T,z);

-title('Rxx(T)');

-xlabel('t in seconds');

+//Scilab Code for Example 9.5 of Signals and systems by
+//P.Ramakrishna Rao
+clc;
+clear;
+function [y]=u(t)
+    if t>=0
+    y=1
+else y=0
+    end
+endfunction
+n=1;
+for t=-10:0.01:10;
+    x(n)=exp(-t)*u(t);
+    n=n+1;
+end
+t=-10:0.01:10;
+plot(t,x);
+title('x(t)');
+n=1;
+for T=-10:0.1:0;
+    z(n)=integrate('exp(-t)*exp(T-t)','t',0,1000);
+    n=n+1;
+end
+n=1;
+for T=0.1:0.1:10;
+    z(n+101)=integrate('exp(-t)*exp(T-t)','t',T,1000);
+    n=n+1;
+end
+figure(1);
+T=-10:0.1:10;
+plot(T,z);
+title('Rxx(T)');
+xlabel('t in seconds');
\ No newline at end of file
diff --git a/1592/CH9/EX9.6/example_9_6.sce b/1592/CH9/EX9.6/example_9_6.sce
index 57cd4a8a9..a52510e23 100755
--- a/1592/CH9/EX9.6/example_9_6.sce
+++ b/1592/CH9/EX9.6/example_9_6.sce
@@ -1,26 +1,25 @@
-//Scilab Code for Example 9.6 of Signals and systems by

-//P.Ramakrishna Rao

-clc;

-clear;

-clear z x y t T;

-A=1;

-n=1;

-wo=2*%pi;

-theta=%pi/2;

-for t=-5:0.01:5;

-    x(n)=A*cos(wo*t+theta);

-    n=n+1;

-end

-t=-5:0.01:5;

-plot(t,x);

-title('x(t)');

-n=1;

-for T=-5:0.1:5;

-    z(n)=(A^2/2)*cos(wo*T);

-    n=n+1;

-end

-figure(1);

-T=-5:0.1:5;

-plot(T,z);

-title('Rxx(T)');

-xlabel('t in seconds')

+//Scilab Code for Example 9.6 of Signals and systems by
+//P.Ramakrishna Rao
+clc;
+clear;
+A=1;
+n=1;
+wo=2*%pi;
+theta=%pi/2;
+for t=-5:0.01:5;
+    x(n)=A*cos(wo*t+theta);
+    n=n+1;
+end
+t=-5:0.01:5;
+plot(t,x);
+title('x(t)');
+n=1;
+for T=-5:0.1:5;
+    z(n)=(A^2/2)*cos(wo*T);
+    n=n+1;
+end
+figure(1);
+T=-5:0.1:5;
+plot(T,z);
+title('Rxx(T)');
+xlabel('t in seconds')
\ No newline at end of file