tutorial 1seg7550 introduction to matlab 18 th, sep. 2009
TRANSCRIPT
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Tutorial 1 SEG7550Introduction to MATLAB
18th, SEP. 2009
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Announcement
If you are from other departments other than SEEM, leave your student ID, name and department to me before you leave. A temporary account will be created for you.
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Access MATLAB outside campus
1 Department VPN service currently is only available to SEEM/AECT Staff, gds and MSc only .
2 Idle timeout of 4 hours 3 First set up a vpn: http://
www.cuhk.edu.hk/itsc/network/vpn/index.html 4 Running X Applications (UNIX) remotely from MS
Windows with VPN
https://www-sl.se.cuhk.edu.hk/seem/index.php/Computer_Facilities:External_Access_Route#Running_X_Applications_.28UNIX.29_remotely_from_MS_Windows_with_VPN
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Introduction to MATLAB
Current version in lab: MATLAB 7.9.0 (R2009b)
Help: F1 In most cases, we will need to read function
help.
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Function help
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Programs
Usually long programs will be written in m file. (File->new->blank m-file)
To run the program, press (save and run), or F5.
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Initial a matrix
Ones: Create array of all ones
Syntax:Y = ones(n); Y = ones(m,n);
Zeros: Create array of all zeros
Syntax:Y = zeros(n); Y = zeros(m,n);
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Vector Functions
Addition:
A = [1 2 3]
B = [6 4 7]
A + B = ?
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Vector Functions
In Matlab
A = [1 2 3];
B = [6 4 7];
A + B ans =
7 6 10
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Vector Functions
Substraction A = [11 2 13]
B = [7 4 7]
A -B = ?
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Vector Functions
In Matlab
A = [11 2 13];
B = [7 4 7];
A - B ans =
4 -2 6
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Vector Functions
Multiplication In matrix calculation, there are two kinds of
multiplication, element by element and matrix multiplication.
Please note that the multiplication of vector must match their size. For example, the size of A and B are m x n and k x j vector respectively. Then m must be equal to k
For element by element multiplication, two matrix must have same size.
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Vector Functions
A = [1 2 3]
B = [2 2 3]'
A * B' = ?
and
A' * B = ?
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Vector Functions
In Matlab A = [1 2 3]; B = [2 2 3]; A * B Error using ==> * Inner matrix dimensions must agree A * B' ans = 15 A' * B ans = 2 2 3 4 4 6 6 6 9
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Vector Functions
A = [1 2 3]
B = [2 3 1]
we want aij * bij, how?
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Vector Functions
In Matlab
A = [1 2 3];
B = [2 3 1];
A .*B
ans =
2 6 3
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Vector Functions
Division element by element (i.e. aij / bij): “./” A = [ 4 6 10]
B = [2 3 5]
aij ./ bij = ?
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In Matlab
A = [4 6 10];
B = [2 3 5];
A./B
ans =
2 2 2
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If
if expression, statements, end If can be used with else, elseif to deal with
complicated cases if expression1 statements1
elseif expression2 statements2 else statements3
end
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An exercise
Could you use Matlab to implement the following logic?
Case OP_CP > 0 and OP_LO > 0 and CP_HI <= 0 : A = 1
Case OP_CP = 0 and OP_LO > 0 and CP_HI < 0 : A = 2
Case OP_CP = 0 and OP_LO = 0 and CP_HI < 0 : A =3
Otherwise, A=4
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Answer
Matlab Code: if op_cp > 0 & op_lo >= 0 & cp_hi <= 0 A = 1; elseif op_cp == 0 & op_lo > 0 & cp_hi < 0 A = 2; elseif op_cp = 0 & op_lo = 0 & cp_hi < 0 A = 3; else A = 4; end
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FOR
Repeat statements a specific number of times.
for x=initval:endval, statements, end Example:
Assign 1,2,3,4,5 ... 10 to A(1), A(2), A(3), A(4), A(5), ... A(10) use if.
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A=zeros(10,1);
for j=1:10,
A(j) = j;
end
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while
Repeatedly execute statements while condition is true.
Syntax: while expression, statements, end Example
Assign 1,2,3,4,5 ... 10 to A(1), A(2), A(3), A(4), A(5), ... A(10) use while.
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A=zeros(10,1);
j=1;
while j<11
A(j) = j;
j=j+1;
end
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Example: Manipulation of the specific row of matrix or vectors
A = [1 2 3 6 1 4 7 9 2 ] Subtract the 2nd row from 1st row of 3 x 3 matrix
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In Matlab A = [ 1, 2, 3;6,1,4;7, 9, 2; ] A =1 2 3 6 1 4 7 9 2
for j=1:3, A(2,j) = A(2,j) - A(3,j); end
A ans = 1 2 3-1 -8 2 7 9 2