Eng.Mohammed Elasmersite.iugaza.edu.ps/masmar/files/MATLAB_LAB_3.pdf · Add your company slogan...
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Feb,2012
Eng.Mohammed Elasmer
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MatLab :Matrix Laboratory
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5
14
Compute:
e and 382801 to 15 digits .Which is bigger?
>> format long; [exp(14), 382801*pi]
ans =
1.0e+006 *
1.202604284164777 1.202604809386827
The second number is bigger.
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6
The fractions : 2709/1024 , 10583/4000 , 2024/765
which of these is the best approximation to 7
[2709/1024, 10583/4000, 2024/765, sqrt(7)]
ans =
2.645507812500000 2.645750000000000 2.645751633986928 2.645751311064591
The third, that is, 2024/765, is the best approximation
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7
Solve:
+ +
+ 1
6 3
3x 4y 5z = 2
2x 3y 7z
x y z
[x, y, z] = solve('3*x + 4*y + 5*z = 2',
'2*x - 3*y + 7*z = -1', 'x - 6*y + z = 3',
'x', 'y', 'z')
x =241/92
y =-21/92
z =-91/92
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2 2simplify: cos sinx x
syms x y
simplify((cos(x)).^2-(sin(x)).^2)
ans = 2*cos(x)^2-1
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randint>> help randint
RANDINT Generate matrix of uniformly distributed
random integers.
>> randint(1,4)
ans = 0 0 1 1
>> randint(1,4,[-1 1])
ans = -1 0 1 -1
>> randint(2,4,[10 12])
ans = 10 12 11 11
12 12 12 12
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Figure Palette (subplot)
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Solving Equation
2x 2x 4 = 0 >> solve('x^2 - 2*x - 4 = 0')
ans = 5^(1/2)+1
1-5^(1/2)
>> double(ans)
ans = 3.2361
-1.2361
% or
>> roots([1 -2 -4])
ans =
3.2361
-1.2361
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Loops
10! 10*9*8*...*2*1
f = 1;
for n = 2:10
f = f*n;
end
f
f = 3628800>> factorial(10)
ans =3628800
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While
i = 1
i = 2
i = 3
i=0
while i<3
i=i+1
end
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f = 1;
for n = 2:10
f = f*n;
pause
f
end
Pause in Loops
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Break
y=0;
while y>0
A=input('enter the value of A= ')
y=y+A
if y>10;
break
end
end
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Loopsx=[ ];
for i=1:4
x=[x,i^2]
end
x = 1
x = 1 4
x = 1 4 9
x = 1 4 9 16
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18
Compute the absolute value of a real number
x=input('enter the number= ');
if x >= 0
y = x;
else
y = -x;
end
If
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If
function y = signum(x)
if x > 0
y = 1;
elseif x == 0
y = 0;
else
y = -1;
end
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5
1
If : [2, 2,3,1,8]
and ( )
Write a Matlab code to get the value of y
n
x
y x n
x=[2 2 3 1 8];
y=0;
for i=1:5;
y=x(i)+y;
end
or
>> sum(x)
ans= 16
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5
1
Given: [2, 2,3,1,8]
and ( ) ( ) * , k=1,2,3,4,5
Write a Matlab code to get the value of y
n
x
y k x n k
x=[2,2,3,1,8];
y=zeros(1,5);
for k=1:5;
for n=1:5;
y(k)=y(k)+x(n)*k;
end
end
y = 16 32 48 64 80
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22
2015
1510
100
2
0
5.0
][
n
n
n
nx
x=0:0.1:20;
y=0.5*(x<10)+0*(x>=10 & x<15) -2*(x>=15 & x<=20);
plot(x,y)
0 10 20-2
-1
0
1
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15 9
[ ] 5 0 9
2 0
x
f x x
x
x=-10:0.01:30 ;
for k=1:length(x)
if x(k)>=9
y(k)=15;
elseif x(k)>=0
y(k)=5;
else
y(k)=2;
end
end
plot(x,y)-10 0 10 20 300
5
10
15
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theta=320;
if(theta>=0 & theta<90)
y=1;
elseif(theta>=90 & theta<180)
y=2;
elseif(theta>=180 & theta<270)
y=3;
else
y=4;
end
y
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Switch …case
Your lost
angle = 80;
switch angle
case 0
disp('East')
case 90
disp('North')
case 180
disp('West')
case 270
disp('South')
otherwise
disp('Your lost')
end
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< less than
> greater than
<= less than or equal
>= greater than or equal
== equal
~= not equal
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>> x=[1 0 1 1 0];
>> y=[0 1 1 0 1];
>> x&y
ans = 0 0 1 0 0
>> x|y
ans = 1 1 1 1 1
>> ~x
ans = 0 1 0 0 1
>> xor(x,y)
ans = 1 1 0 1 1
& and | or
~ not xor
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Let A=[5 17 -3 8 0 -1 12 15 20 -6 6 4 -7 16].
write code that doubles the element that are :
positive and are divisible by 3 or 5,
and raise to the power of 3 the element that are:
negative but greater than -5
Hint
Use OR | , AND & , rem(a,b)
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Let y=[5 17 -3 8 0 -1 12 15 20 -6 6 4 -7 16].
write code that doubles the element that are :
positive and are divisible by 3 or 5,
and raise to the power of 3 the element that are:
negative but greater than -5
Hint
Use OR | , AND & , rem(a,b)
y = [5 17 -3 8 0 -1 12 15 20 -6 6 4 -7 16].
out=[10 17 -27 8 0 -1 24 30 40 -6 12 4 -7 16].
Example:
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y=[5 17 -3 8 0 -1 12 15 20 -6 6 4 -7 16];
A=y;
for x=1:length(y);
if y(x)>=0&rem(y(x),3)==0|rem(y(x),5)==0
y(x)=2*y(x);
elseif y(x)<0&y(x)>-5
y(x)=y(x)^3;
end
end
[A;y]
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Let y=[5 17 -3 8;0 -1 12 15;20 -6 6 4];
write code that doubles the element that are :
positive and are divisible by 3 or 5,
and raise to the power of 3 the element that are:
negative but greater than -5
Hint
Use OR | , AND & , rem(a,b)
Repeat if :
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y=[5 17 -3 8;0 -1 12 15;20 -6 6 4];
A=y;
[a,b]=size(y);
for i=1:a;
for j=1:b;
if y(i,j)>=0&rem(y(i,j),3)==0|rem(y(i,j),5)==0
y(i,j)=2*y(i,j);
elseif y(i,j)<0&y(i,j)>-5
y(i,j)=y(i,j)^3;
end
end
end
A
y
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>> help bi2de
BI2DE Convert binary vectors to decimal
numbers.
>> B = [0 0 1 1; 1 0 1 0]
B =
0 0 1 1
1 0 1 0
>> D = bi2de(B,'left-msb')
D =
3
10
bi2de
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>> B = de2bi([3;10],'left-msb')
B = 0 0 1 1
1 0 1 0
de2bi
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dec2hex & hex2dec >> dec2hex(12)
ans =C
>> dec2hex(18)
ans =12
>> dec2hex(26)
ans =1A
>> hex2dec('1A')
ans =26
>> hex2dec('12')
ans =18
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>> help mod
MOD Modulus after division.
Modulus
>> mod(9,3)
ans = 0
>> mod(10,3)
ans =1
>> mod(11,3)
ans =2
>> mod(3,9)
ans =3
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Convert Point P(1,3,5) form Cartesian to spherical
( , , ) (5.91,32.31 ,71.56 )o or
>> [phi,theta,r]=cart2sph(1,3,5)
phi =1.2490
theta =1.0069
r =5.9161
cart2sph
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Convert Point P(1,3,5) form Cartesian to spherical
Sph2cart(phi,theta,r)
>> [x,y,z]=sph2cart(1.249,1.0069,5.916)
x =1.0001
y = 2.9997
z =5.0001
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pol2cart(phi,rho,z)
>> [X,Y,Z] = pol2cart(pi/6,2,5)
X =1.7321
Y =1.0000
Z =5
Convert Point P(2,pi/6,5) form cylindrical to Cartesian
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cov Covariance matrix
max Largest elements in array
mean Average or mean value of array
median Median value of array
min Smallest elements in array
mode Most frequent values in array
std Standard deviation
var Variance
Descriptive Statistics
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>> x=[60 70 62 73 75 70 80 90 99 100];
>> var(x)
ans =201.6556
>> std(x)
ans =14.2005
>> mean(x)
ans =77.9000
![Page 42: Eng.Mohammed Elasmersite.iugaza.edu.ps/masmar/files/MATLAB_LAB_3.pdf · Add your company slogan LOGO 6 The fractions : 2709/1024 , 10583/4000 , 2024/765 which of these is the best](https://reader034.fdocuments.in/reader034/viewer/2022050420/5f968145f6375c6f7372884b/html5/thumbnails/42.jpg)
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>> median([1 2 3 4 5])
ans =3
>> median([1 2 3 4 5 6])
ans =3.5000
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>> A=[1,2,3;4,5,6;7,8,9];
>> xlswrite('data.xls',A)
xlswriteWrite Microsoft Excel spreadsheet file
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Read Microsoft Excel spreadsheet file
xlsread
>> y=xlsread('data.xls')
y = 1 2 3
4 5 6
7 8 9
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Database>>E(1)=struct('Name','Ali','Age','24','Phone','12355');
>>E(2)=struct('Name','Ahmed','Age','23','Phone','99324');
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Database>>E(1)=struct('Name','Ali','Age','24','Phone','12355');
>>E(2)=struct('Name','Ahmed','Age','23','Phone','99324');
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