initial commit / add all books

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diff --git a/2294/CH2/EX2.2/EX2_2.sce b/2294/CH2/EX2.2/EX2_2.sce
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+//Example 2.2<i>

+//Find whether the given signal is causal or not.

+clear all;

+clc;

+n=10;x1(1)=1;x2(1)=1;

+for i=2:length(n)

+  x1(i)=i; 

+   x2(i)=i-1;

+   y(i)=x1(i)+1 ./x2(i);

+    end

+causal=%t;

+for i=1:length(n)

+    if n(i)<0 &y(i)~=0 then

+        causal=%f;

+    end

+end

+disp(causal,"The statement that the system is causal is:");

+//Example 2.2<ii>

+//Find whether the given signal is causal or not.

+clear all;

+clc;

+n=10;x1(1)=1;x2(1)=-1;

+for i=2:length(n)

+  x1(i)=i; 

+   x2(i)=i-2;

+   y(i)=x1(i).*x1(i)+x2(i);

+    end

+causal=%t;

+for i=1:length(n)

+    if n(i)<0 &y(i)~=0 then

+        causal=%f;

+    end

+end

+disp(causal,"The statement that the system is causal is:");

+//Example 2.2<vi>

+//Find whether the given signal is causal or not.

+clear all;

+clc;

+n=-10:10;

+for i=1:length(n)

+  x(i)=i; 

+   y(i)=(i.^2);

+    end

+causal=%t;

+for i=1:length(n)

+    if n(i)<0 &y(i)~=0 then

+        causal=%f;

+    end

+end

+disp(causal,"The statement that the system is causal is:");

+

diff --git a/2294/CH2/EX2.3/EX2_3.sce b/2294/CH2/EX2.3/EX2_3.sce
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index 000000000..6df614b7a
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+//Example 2.3<v>

+//Check whether the following signal is linear or not.

+clear;

+close;

+clc;

+T=20;//length of the signal

+A=5;

+B=4;

+for n=1:T

+    x(n)=n;

+    y(n)=A*x(n)+B;

+end

+x1=x;

+y1=y;

+for n=1:T

+    x2(n)=2;y2(n)=A*x2(n)+B;

+end

+z=y1+y2;

+for n=1:T

+    y3(n)=A*(x1(n)+x2(n))+B;

+end

+if z==y3 then

+    disp('The following signal is linear');

+else 

+    disp('The following signal is non linear');

+end

+//Example 2.3<vi>

+//Check whether the following signal is linear or not.

+clear;

+close;

+clc;

+T=20;//length of the signal

+x1(1)=1;

+x2(1)=2;

+for n=2:T

+    x1(n)=n;

+    x2(n)=2*n;

+    y1(n)=(2*(x1(n)))+(1/x1(n-1));

+    y2(n)=(2*(x2(n)))+(1/x2(n-1));

+end

+z=y1+y2;

+for n=2:T

+   y3(n)=(2*(x1(n)+x2(n)))+(1/(x1(n-1)+x2(n-1)));

+end

+if z==y3 then

+    disp('The following signal is linear');

+else 

+    disp('The following signal is non linear');

+end

+//Example 2.3<vii>

+//Check whether the following signal is linear or not.

+clear;

+close;

+clc;

+T=20;//length of the signal

+for n=1:T

+    x(n)=n;

+    y(n)=n*x(n);

+end

+x1=x;

+y1=y;

+for n=1:T

+    x2(n)=2;y2(n)=n*x2(n);

+end

+z=y1+y2;

+for n=1:T

+    y3(n)=n*(x1(n)+x2(n));

+end

+if z==y3 then

+    disp('The following signal is linear');

+else 

+    disp('The following signal is non linear');

+end

diff --git a/2294/CH2/EX2.4/EX2_4.sce b/2294/CH2/EX2.4/EX2_4.sce
new file mode 100755
index 000000000..d4bc27575
--- /dev/null
+++ b/2294/CH2/EX2.4/EX2_4.sce
@@ -0,0 +1,60 @@
+//Example 2.4<i>

+//Check whether the following signal is linear or not.

+clear;

+close;

+clc;

+T=20;//length of the signal

+for n=1:T

+    x1(n)=n;x2(n)=2*n;

+    y1(n)=exp(x1(n));

+    y2(n)=exp(x2(n));

+end

+z=y1+y2;

+for n=1:T

+    y3(n)=exp(x1(n)+x2(n));

+end

+if z==y3 then

+    disp('The following signal is linear');

+else 

+    disp('The following signal is non linear');

+end

+//Example 2.4<ii>

+//Check whether the following signal is linear or not.

+clear;

+close;

+clc;

+T=20;//length of the signal

+for n=1:T

+    x1(n)=n;x2(n)=2*n;

+    y1(n)=x1(n)*x1(n);

+    y2(n)=x2(n)*x2(n);

+end

+z=y1+y2;

+for n=1:T

+    y3(n)=(x1(n)+x2(n))^2;

+end

+if z==y3 then

+    disp('The following signal is linear');

+else 

+    disp('The following signal is non linear');

+end

+//Example 2.4<iii>

+//Check whether the following signal is linear or not.

+clear;

+close;

+clc;

+T=20;//length of the signal

+for n=1:T

+    x1(n)=n;x2(n)=2*n;

+    y1(n)=n^2*(x1(n));

+    y2(n)=n^2*(x2(n));

+end

+z=y1+y2;

+for n=1:T

+    y3(n)=n^2*(x1(n)+x2(n));

+end

+if z==y3 then

+    disp('The following signal is linear');

+else 

+    disp('The following signal is non linear');

+end

diff --git a/2294/CH2/EX2.5/EX2_5.sce b/2294/CH2/EX2.5/EX2_5.sce
new file mode 100755
index 000000000..338063db3
--- /dev/null
+++ b/2294/CH2/EX2.5/EX2_5.sce
@@ -0,0 +1,71 @@
+//Example 2.5<i>

+//Determine whether the following system is time invariant or not.

+clc;

+clear  all;

+T=20;//length of the signal.

+s=2;//shift

+for n=1:T

+    x(n)=n;

+    y(n)=n*x(n);

+end

+IP=x(T-s);

+OP=y(T-s);

+if IP==OP then

+    disp('The given system is time invariant');

+else

+    disp('The given system is  time variant');

+end

+//Example 2.5<ii>

+//Determine whether the following system is time invariant or not.

+clc;

+clear  all;

+T=-10:10;//length of the signal.

+s=2;//shift

+for n=1:length(T)

+    x(n)=2;

+    y(n)=x(n)*cos(50*%pi.*T(n));

+end

+IP=x(T(n)-s);

+OP=y(T(n)-s);

+if IP==OP then

+    disp('The given system is time invariant');

+else

+    disp('The given system is  time variant');

+end

+//Example 2.5<vi>

+//Determine whether the following signal is time invariant or not.

+clc;

+clear all;

+N=10;

+s=1//shift;

+k=2;

+for n=1:N

+    x(n)=n;

+end

+for n=1:(N/k)

+    y(n)=x(k*n);

+end

+ip=x(N-s);

+op=y((N/k)-s);

+if(ip==op) then

+    disp('the following signal is time invariant');

+else 

+    disp('The given signal is time variant');

+//Example 2.5<vii>

+//Determine whether the following signal is time invariant or not.

+clc;

+clear all;

+T=20;

+s=4;//shift

+x(1)=1

+for n=2:T

+    x(n)=n;

+    y(n)=x(n-1).*x(n-1);

+end

+inputshift=x(T-s);

+outputshift=y(T-s);

+if (inputshift==outputshift) then

+    disp('The given signal is time invariant');

+else 

+    disp('The given signal is  time variant');

+end

diff --git a/2294/CH2/EX2.7/EX2_7.sce b/2294/CH2/EX2.7/EX2_7.sce
new file mode 100755
index 000000000..966088cce
--- /dev/null
+++ b/2294/CH2/EX2.7/EX2_7.sce
@@ -0,0 +1,82 @@
+//Check for the following system.

+//Example 2.7 <i>

+clc;

+clear ;//a>check whether static or dynamic

+t=-10:.1:10;T=length(t)

+s=2;

+for i=1:length(t)

+    x(i)=i;

+    y(i)=abs(x(i));

+end

+if y(2)==x(2)& y(2)==x(1) then

+    disp('The given signal is dynamic' );

+else 

+    disp('the given signal is static');

+end

+//b>check whether linear or non linear

+x1=x;

+y1=y;

+for i=1:length(t)

+    x2(i)=-2;

+    y2(i)=abs(x2(i));

+end

+for i=1:length(t)

+z(i)=y1(i)+y2(i);

+end

+for i=1:length(t)

+    y3(i)=abs(x1(i)+x2(i));

+end

+if z==y3 then

+    disp('The given signal is linear');

+else

+    disp('Not linear');

+end

+//c>check whether time invariant or not

+IP=x(T-s);

+OP=y(T-s);

+if IP == OP then

+disp('the given signal is time invariant');

+else 

+      disp('The given signal is not time invariant');

+    end

+//Check for the following systems

+//Example 2.7 <ii>

+clc;

+clear all;//a>check whether static or dynamic

+t=0:5;T=length(t);w=1;

+s=2;

+for i=1:length(t)

+    x(i)=i;

+    y(i)=x(i)*cos(w*t(i));

+end

+if y(2)==x(2)& y(2)==x(1) then

+    disp('The given signal is dynamic' );

+else 

+    disp('the given signal is static');

+end

+//b>check whether linear or non linear

+x1=x;

+y1=y;

+for i=1:length(t)

+    x2(i)=2*i;

+    y2(i)=x2(i)*cos(w*t(i));

+    y3(i)=cos(w*t(i))*(x1(i)+x2(i));

+end

+z=y1+y2;

+if z~=y3 then

+    disp('The given signal is not linear');

+else

+    disp('linear');

+end

+//c>check whether time invariant or not

+IP=x(T-s);

+OP=y(T-s);

+if IP == OP then

+disp('the given signal is time invariant');

+else 

+      disp('The given signal is not time invariant');

+    end

+

+

+

+