a=[1 2 3;4 5 6;7 8 9]

a =

     1     2     3
     4     5     6
     7     8     9

a(2,2)=2

a =

     1     2     3
     4     2     6
     7     8     9

b=a(1,:)


b =

     1     2     3

%to to iste

b=a([1],:)

b =

     1     2     3

%zaokruhlovanie od 0.5 hore

round(1.5)

ans =

     2

round(1.4)

ans =

     1

%zaokruhlovanie k nule

fix(1.8)

ans =

     1

fix(-1.8)

ans =

    -1

%zaokruhlovanie hore

floor(1.8)

ans =

     1

floor(-0.8)

ans =

    -1

%zaokruhlovanie hore

ceil(1.2)

ans =

     2

ceil(-1.2)

ans =

    -1

a =

     1     2     3
     4     2     6
     7     8     9

%vyberanie riadkov 1,3

c=a([1,3],:)

c =

     1     2     3
     7     8     9

d=a([3,1],:)

d =

     7     8     9
     1     2     3
a

a =

     1     2     3
     4     2     6
     7     8     9

a([3,1],[2,1,3])

ans =

     8     7     9
     2     1     3

v=1:4

v =

     1     2     3     4

%scitavnie

sum(v)

ans =

    10

a

a =

     1     2     3
     4     2     6
     7     8     9

a(2,2)=5

a =

     1     2     3
     4     5     6
     7     8     9

%scitanie matice

x=sum(a)

x =

    12    15    18

%celkovy sucet matice

sum(sum(a))

ans =

    45

x=sum(a,1)

x =

    12    15    18

%po stlpcoch

x1=sum(a,1)

x1 =

    12    15    18

%po riadkoch

x2=sum(a,2)

x2 =

     6
    15
    24

%vypis celej matice

a(:)

ans =

     1
     4
     7
     2
     5
     8
     3
     6
     9


%matlab si maticu uklada alebo indexuje do stlpca

a(5)

ans =

     5

b

b =

     1     2     3

b1=4:6

b1 =

     4     5     6

b=[b;b1]

b =

     1     2     3
     4     5     6

size(b)

ans =

     2     3

c=b(:)

c =

     1
     4
     2
     5
     3
     6
%vytvorenie matice rozmeru 2x3 pomocu vektora

reshape(c,2,3)

ans =

     1     2     3
     4     5     6

%matica 3X2

reshape(c,3,2)

ans =

     1     5
     4     3
     2     6

% to iste ked dame maticu b

reshape(b,3,2)

ans =

     1     5
     4     3
     2     6