matrik 3 x 4 yang isinya nol semua
zeros(3,4)
ans =
0 0 0 0
0 0 0 0
0 0 0 0
>> eye(3)
ans =
1 0 0
0 1 0
0 0 1
>> eye(5)
ans =
1 0 0 0 0
0 1 0 0 0
0 0 1 0 0
0 0 0 1 0
0 0 0 0 1
zeros(3,4)
ans =
0 0 0 0
0 0 0 0
0 0 0 0
% matriks pembuat nol ==> zeros(nb,bk)
>> % matriks identitas ?>> eye(3)
ans =
1 0 0
0 1 0
0 0 1
>> eye(5)
ans =
1 0 0 0 0
0 1 0 0 0
0 0 1 0 0
0 0 0 1 0
0 0 0 0 1
menentukan variabel dengan determinan
>> % x+3y+z=4
>> %2x-6y-z=12
>> %4y+3z=-6
>> A= [1 3 1 ; 2 -6 -1; 0 4 3]
A =
1 3 1
2 -6 -1
0 4 3
>> B= [4 3 1 ; 12 -6 -1; -6 4 3]
B =
4 3 1
12 -6 -1
-6 4 3
>> C= [1 4 1 ; 2 12 -1; 0 -6 3]
C =
1 4 1
2 12 -1
0 -6 3
>> D= [1 3 4 ; 2 -6 12; 0 4 -6]
D =
1 3 4
2 -6 12
0 4 -6
>> x= det(B)/det(A)
x =
5.5833
>> y= det(C)/det(A)
y =
0.2500
>> z= det(D)/det(A)
z =
-2.3333
>> 4*y+3*z
ans =
-6
> % cara 2 ==> Q*(x,y,z)=R
>> %matriks Q
>> %matriks R
>> %c=R/Q
>> %c=Q\R
>> Q=A
Q =
1 3 1
2 -6 -1
0 4 3
>> R=[4;12;-6]
R =
4
12
-6 c=Q\R
c =
5.5833
0.2500
-2.3333
>> %c=R/Q g mau lhoooo
>> %matriks inversi
>> Q
Q =
1 3 1
2 -6 -1
0 4 3
>> J=inv(Q)
J =
0.5833 0.2083 -0.1250
0.2500 -0.1250 -0.1250
-0.3333 0.1667 0.5000
>> J*Q
ans =
1.0000 0.0000 0.0000
0 1.0000 0
0 0.0000 1.0000
>> %magic untuk memunculkan bariss dan kolom yang sama yang nilainya sesuai dengan yang diinginkan
>> magic(2)
ans =
1 3
4 2
>> magic(3)
ans =
8 1 6
3 5 7
4 9 2
h= [ 2 3 4 5]
h =
2 3 4 5
>> diag(h)
ans =
2 0 0 0
0 3 0 0
0 0 4 0
0 0 0 5
>> diag(h,-2)
ans =
0 0 0 0 0 0
0 0 0 0 0 0
2 0 0 0 0 0
0 3 0 0 0 0
0 0 4 0 0 0
0 0 0 5 0 0
>> diag(h,1)
ans =
0 2 0 0 0
0 0 3 0 0
0 0 0 4 0
0 0 0 0 5
0 0 0 0 0
>> %diag([isi matrik],posisi)
>> J=[1 2 3; 4 5 6; 7 8 9]
J =
1 2 3
4 5 6
7 8 9
rot90(J)
ans =
3 6 9
2 5 8
1 4 7
rot90(J,-2)
ans =
9 8 7
6 5 4
3 2 1
>> % manipulasi matrik
>> %pencerminan secara vertikal ==>fliplr
% flipud===> secara horisontal
>> J
J =
1 2 3
4 5 6
7 8 9
>> fliplr(J)
ans =
3 2 1
6 5 4
9 8 7
>> R=[3 4 5 2; 3 8 6 5 ; 3 5 2 4]
R =
3 4 5 2
3 8 6 5
3 5 2 4
>> %reshape(nama matriks,nb,nk)
>> reshape(R,2,6)
ans =
3 3 8 5 2 5
3 4 5 6 2 4
repmat=replikasi matrik
repmat(R,2,1)
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