v=linspace(-4,25,20);
v1=-4:3.79:25

v1 =

  Columns 1 through 5

   -4.0000   -0.2100    3.5800    7.3700   11.1600

  Columns 6 through 8

   14.9500   18.7400   22.5300

m=1:4;
M=[m;m;m;m]

M =

     1     2     3     4
     1     2     3     4
     1     2     3     4
     1     2     3     4

n=1:3:10;
N=[n',(n*2)', (n*3)']

N =

     1     2     3
     4     8    12
     7    14    21
    10    20    30

v=1:4;
v

v =

     1     2     3     4

5*v

ans =

     5    10    15    20

v*5

ans =

     5    10    15    20

v-4

ans =

    -3    -2    -1     0

4-v

ans =

     3     2     1     0

v/3

ans =

    0.3333    0.6667    1.0000    1.3333

3/v
{Error using <a href="matlab:helpUtils.errorDocCallback('mrdivide')" style="font-weight:bold"> / </a>
Matrix dimensions must agree.
} 
v^2
{Error using <a href="matlab:helpUtils.errorDocCallback('mpower')" style="font-weight:bold"> ^ </a>
Inputs must be a scalar and a square matrix.
To compute elementwise POWER, use POWER (.^)
instead.
} 
v1=1:3;
v+v1
{Error using <a href="matlab:helpUtils.errorDocCallback('plus')" style="font-weight:bold"> + </a>
Matrix dimensions must agree.
} 
v1=10:14;
v+v1
{Error using <a href="matlab:helpUtils.errorDocCallback('plus')" style="font-weight:bold"> + </a>
Matrix dimensions must agree.
} 
v1=10:13;
v+v1

ans =

    11    13    15    17

v1-v

ans =

     9     9     9     9

v*v1
{Error using <a href="matlab:helpUtils.errorDocCallback('mtimes')" style="font-weight:bold"> * </a>
Inner matrix dimensions must agree.
} 
v*v1'

ans =

   120

v'*v1

ans =

    10    11    12    13
    20    22    24    26
    30    33    36    39
    40    44    48    52

M

M =

     1     2     3     4
     1     2     3     4
     1     2     3     4
     1     2     3     4

5*M

ans =

     5    10    15    20
     5    10    15    20
     5    10    15    20
     5    10    15    20

M*5

ans =

     5    10    15    20
     5    10    15    20
     5    10    15    20
     5    10    15    20

M/5

ans =

    0.2000    0.4000    0.6000    0.8000
    0.2000    0.4000    0.6000    0.8000
    0.2000    0.4000    0.6000    0.8000
    0.2000    0.4000    0.6000    0.8000

5/M
{Error using <a href="matlab:helpUtils.errorDocCallback('mrdivide')" style="font-weight:bold"> / </a>
Matrix dimensions must agree.
} 
M

M =

     1     2     3     4
     1     2     3     4
     1     2     3     4
     1     2     3     4

M*v
{Error using <a href="matlab:helpUtils.errorDocCallback('mtimes')" style="font-weight:bold"> * </a>
Inner matrix dimensions must agree.
} 
v*M

ans =

    10    20    30    40

M*v'

ans =

    30
    30
    30
    30

M5=m*5;
M5=M*5;
M

M =

     1     2     3     4
     1     2     3     4
     1     2     3     4
     1     2     3     4

M5

M5 =

     5    10    15    20
     5    10    15    20
     5    10    15    20
     5    10    15    20

M+M5

ans =

     6    12    18    24
     6    12    18    24
     6    12    18    24
     6    12    18    24

M5-M

ans =

     4     8    12    16
     4     8    12    16
     4     8    12    16
     4     8    12    16

M*M

ans =

    10    20    30    40
    10    20    30    40
    10    20    30    40
    10    20    30    40

M/M5
[Warning: Matrix is singular to working precision.] 

ans =

   NaN   NaN   NaN   NaN
   NaN   NaN   NaN   NaN
   NaN   NaN   NaN   NaN
   NaN   NaN   NaN   NaN

M/M
[Warning: Matrix is singular to working precision.] 

ans =

   NaN   NaN   NaN   NaN
   NaN   NaN   NaN   NaN
   NaN   NaN   NaN   NaN
   NaN   NaN   NaN   NaN

B=magic(4)

B =

    16     2     3    13
     5    11    10     8
     9     7     6    12
     4    14    15     1

B/B
[Warning: Matrix is close to singular or badly
scaled. Results may be inaccurate. RCOND =
1.306145e-17.] 

ans =

     1     0     0     0
     0     1     0     0
     0     0     1     0
     0     0     0     1

5.+6

ans =

    11

a=5;
a.+4
 a.+4
   |
{Error: Unexpected MATLAB operator.
} 
v*v1
{Error using <a href="matlab:helpUtils.errorDocCallback('mtimes')" style="font-weight:bold"> * </a>
Inner matrix dimensions must agree.
} 

v.*v1

ans =

    10    22    36    52

v

v =

     1     2     3     4

v1

v1 =

    10    11    12    13

v^2
{Error using <a href="matlab:helpUtils.errorDocCallback('mpower')" style="font-weight:bold"> ^ </a>
Inputs must be a scalar and a square matrix.
To compute elementwise POWER, use POWER (.^)
instead.
} 
v.^2

ans =

     1     4     9    16

v/v

ans =

    1.0000

v/v1

ans =

    0.2247

v./v1

ans =

    0.1000    0.1818    0.2500    0.3077

c=(v./v1)*10

c =

    1.0000    1.8182    2.5000    3.0769

help round
<strong>round</strong> - Round to nearest integer

    This MATLAB function <strong>round</strong>s the elements of X to the nearest integers.

    Y = <strong>round</strong>(X)

    <a href="matlab:doc round">Reference page for round</a>

    See also <a href="file:///C:/Program%20Files/MATLAB/R2014a/help/matlab/ref/ceil.html">ceil</a>, <a href="file:///C:/Program%20Files/MATLAB/R2014a/help/matlab/ref/fix.html">fix</a>, <a href="file:///C:/Program%20Files/MATLAB/R2014a/help/matlab/ref/floor.html">floor</a>

    Other functions named round
        <a href="file:///C:/Program%20Files/MATLAB/R2014a/help/fixedpoint/ref/round.html">fixedpoint/round</a>

round(c)

ans =

     1     2     3     3

c

c =

    1.0000    1.8182    2.5000    3.0769

c=[1.5 2.89 1.2 -3.5 -2.6 -2.1 ]

c =

  Columns 1 through 5

    1.5000    2.8900    1.2000   -3.5000   -2.6000

  Column 6

   -2.1000

round(c)

ans =

     2     3     1    -4    -3    -2

ceil(c)

ans =

     2     3     2    -3    -2    -2

c

c =

  Columns 1 through 5

    1.5000    2.8900    1.2000   -3.5000   -2.6000

  Column 6

   -2.1000

floor(c)

ans =

     1     2     1    -4    -3    -3

c

c =

  Columns 1 through 5

    1.5000    2.8900    1.2000   -3.5000   -2.6000

  Column 6

   -2.1000

fix(c)

ans =

     1     2     1    -3    -2    -2

c

c =

  Columns 1 through 5

    1.5000    2.8900    1.2000   -3.5000   -2.6000

  Column 6

   -2.1000

s=759.47

s =

  759.4700

(round(s/10))*10

ans =

   760

round(s/10)*10

ans =

   760

round(s*10)/10

ans =

  759.5000

v1

v1 =

    10    11    12    13

v(2)

ans =

     2

v1(2)

ans =

    11

v1(4/2)

ans =

    11

v1(4/3)
{Subscript indices must either be real positive
integers or logicals.
} 
v1(fix(4/3))

ans =

    10

v1(1+3-2)

ans =

    11

V1([1 3])
{Undefined function 'V1' for input arguments of type
'double'.
} 
v1([1 3])

ans =

    10    12

v1(5)
{Index exceeds matrix dimensions.
} 
v1(1 3)
 v1(1 3)
      |
{Error: Unexpected MATLAB expression.
} 
v1(2:4)

ans =

    11    12    13

v1([2:4])

ans =

    11    12    13

v1([1:3 2:4])

ans =

    10    11    12    11    12    13

v1(1:3 2:4)
 v1(1:3 2:4)
        |
{Error: Unexpected MATLAB expression.
} 
v1(3:-1:1)

ans =

    12    11    10

v1(2:end)

ans =

    11    12    13

v1(:)

ans =

    10
    11
    12
    13

M

M =

     1     2     3     4
     1     2     3     4
     1     2     3     4
     1     2     3     4

M=M*5

M =

     5    10    15    20
     5    10    15    20
     5    10    15    20
     5    10    15    20

M(2,3)

ans =

    15

M([1 3],4/2)

ans =

    10
    10

M([1 3],1:3)

ans =

     5    10    15
     5    10    15

M([1 3],end)

ans =

    20
    20

M([1 3],:)

ans =

     5    10    15    20
     5    10    15    20

M(:,:)

ans =

     5    10    15    20
     5    10    15    20
     5    10    15    20
     5    10    15    20

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

M =

     1     2     3
     4     5     6
     7     8     9

M(3)

ans =

     7

M(7)

ans =

     3

M(:)

ans =

     1
     4
     7
     2
     5
     8
     3
     6
     9

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