disp('hello there');
hello there
disp('hello there!$');
hello there!$
disp('don't forget class ends at 4:35');
 disp('don't forget class ends at 4:35');
           |
{Error: Unexpected MATLAB expression.
} 
disp('don''t forget class ends at 4:35');
don't forget class ends at 4:35
input('give me a number')
give me a number5

ans =

     5

input('give me a number ')
give me a number 6

ans =

     6

a = input('give me a number ')
give me a number 7

a =

     7

a = input('give me a number ');
give me a number 8
disp(a)
     8

a = input('give me a number ', 's');
give me a number hello
disp(a)
hello
b = input('give me a number ');
give me a number hello
{Attempt to execute SCRIPT hello as a function:
/Users/mweeks/Documents/MATLAB/hello.m
} 
give me a number a
disp(a)
hello
disp(b)
hello
b = input('give me a number ','s');
give me a number a
disp(b)
a
b = input('give me a number ');
give me a number 17.3
disp(b)
   17.3000

c = input('give me a number ');
give me a number 9
whos
  Name      Size            Bytes  Class     Attributes

  a         1x5                10  char                
  ans       1x1                 8  double              
  b         1x1                 8  double              
  c         1x1                 8  double              

disp(c)
     9

d = uint8(9)

d =

    9

whos
  Name      Size            Bytes  Class     Attributes

  a         1x5                10  char                
  ans       1x1                 8  double              
  b         1x1                 8  double              
  c         1x1                 8  double              
  d         1x1                 1  uint8               

disp(sprintf('hello %s you are %d years old', a, c))
hello hello you are 9 years old
example_switch
a is less than b
four
???
a is unknown value
three
four
five
six or seven
five
six or seven
five
six or seven
???
a is unknown value
a less
a 6  b 5  c 8
a between b and c
cos(4)

ans =

   -0.6536

help cos
 <strong>cos</strong>    Cosine of argument in radians.
    <strong>cos</strong>(X) is the cosine of the elements of X. 
 
    See also <a href="matlab:help acos">acos</a>, <a href="matlab:help cosd">cosd</a>.

    Overloaded methods:
       <a href="matlab:help codistributed/cos">codistributed/cos</a>
       <a href="matlab:help gpuArray/cos">gpuArray/cos</a>
       <a href="matlab:help sym/cos">sym/cos</a>

    Reference page in Help browser
       <a href="matlab:doc cos">doc cos</a>

cos(4,5)
{Error using <a href="matlab:helpUtils.errorDocCallback('cos')" style="font-weight:bold">cos</a>
Too many input arguments.
} 
cos(5)

ans =

    0.2837

edit exfun.m
help exfun
  exfun.m 
  
  This is an example function.
  With an integer parameter, return a 0 if it is even,
  or 1 if it is odd.
  -MCW
 
  Usage:
    exfun(5)

exfun(5)

ans =

     1

exfun(6)

ans =

     1

exfun(7)

ans =

     1

exfun(8)

ans =

     1

help od

od not found.

Use the Help browser search field to <a href="matlab:docsearch od">search the documentation</a>, or
type "<a href="matlab:help help">help help</a>" for help command options, such as help for methods.

help mod
 <strong>mod</strong>    Modulus after division.
    <strong>mod</strong>(x,y) is x - n.*y where n = floor(x./y) if y ~= 0.  If y is not an
    integer and the quotient x./y is within roundoff error of an integer,
    then n is that integer.  The inputs x and y must be real arrays of the
    same size, or real scalars.
 
    The statement "x and y are congruent mod m" means mod(x,m) == mod(y,m).
 
    By convention:
       <strong>mod</strong>(x,0) is x.
       <strong>mod</strong>(x,x) is 0.
       <strong>mod</strong>(x,y), for x~=y and y~=0, has the same sign as y.
 
    Note: REM(x,y), for x~=y and y~=0, has the same sign as x.
    <strong>mod</strong>(x,y) and REM(x,y) are equal if x and y have the same sign, but
    differ by y if x and y have different signs.
 
    See also <a href="matlab:help rem">rem</a>.

    Overloaded methods:
       <a href="matlab:help codistributed/mod">codistributed/mod</a>
       <a href="matlab:help gpuArray/mod">gpuArray/mod</a>
       <a href="matlab:help sym/mod">sym/mod</a>

    Reference page in Help browser
       <a href="matlab:doc mod">doc mod</a>

mod(9,3)

ans =

     0

mod(10,3)

ans =

     1

mod(10,2)

ans =

     0

mod(11,2)

ans =

     1

mod(12,2)

ans =

     0

mod(13,2)

ans =

     1

clc
exfun(1)

ans =

     1

exfun(2)

ans =

     0

exfun(3)

ans =

     1

exfun(4)

ans =

     0

type exfun.m

% exfun.m 
% 
% This is an example function.
% With an integer parameter, return a 0 if it is even,
% or 1 if it is odd.
% -MCW
%
% Usage:
%   exfun(5)

function rval = exfun(in)

rval = mod(in, 2);

type exfun.m

% exfun.m 
% 
% This is an example function.
% With an integer parameter, return a 0 if it is even,
% or 1 if it is odd.
% -MCW
%
% Usage:
%   exfun(5)

%function rval = exfun(in)
function exfun(in)

rval = mod(in, 2);

exfun(4)
exfun(5)
disp(exfun(5))
{Error using <a href="matlab:helpUtils.errorDocCallback('exfun')" style="font-weight:bold">exfun</a>
Too many output arguments.
} 
type exfun.m

% exfun.m 
% 
% This is an example function.
% With an integer parameter, return a 0 if it is even,
% or 1 if it is odd.
% -MCW
%
% Usage:
%   exfun(5)

function rval = exfun(in)

rval = mod(in, 2);

exfun(5)

ans =

     1

exfun(5)

ans =

     1

exfun(4)

ans =

     0

exfun(3)

ans =

     1

exfun(2)

ans =

     0

exfun(2.6)

ans =

     1

f = 0.1

f =

    0.1000

disp(sprintf('%tx', f))
3dcccccd
if (sqrt(7^2) == 7)
disp('equal');
else
disp('unequal');
end
equal
if (sqrt(7)^2 == 7)
disp('equal');
else
disp('unequal');
end
unequal
sqrt(7)^2

ans =

    7.0000

fomrat long
{Undefined function 'fomrat' for input arguments of type
'char'.
} 
format long
sqrt(7)^2

ans =

   7.000000000000001

clc
exfun(11)

ans =

     1

exfun(-11)

ans =

     1

exfun(-10)

ans =

     0

exfun(0)

ans =

     0

exfun(1j)

ans =

     1

exfun(i)

ans =

     1

disp(i)
  0.000000000000000 + 1.000000000000000i

exfun(1+i)

ans =

     1

exfun(2+i)

ans =

     1

exfun(2+2i)

ans =

     0

exfun(1+2i)

ans =

     1

real(1+2i)

ans =

     1

real(4+2i)

ans =

     4

real(6+2i)

ans =

     6

real(5+2i)

ans =

     5

real(5+i)

ans =

     5

exfun(3.9)

ans =

     1

exfun(3.9999999999999999)

ans =

     0

exfun(3.9999999999999)

ans =

     1

exfun(3.99999999999999)

ans =

     1

exfun(3.9999999999999999)

ans =

     0

exfun(3.999999999999999)

ans =

     1

exfun(3.9999999999999994)

ans =

     1

exfun(-3.9999999999999994)

ans =

     1

exfun(-3.99999999999999999)

ans =

     0

exfun('$')

ans =

     0

exfun(-'$')

ans =

     0

exfun(' ')

ans =

     0

exfun('!')

ans =

     1

exfun('"')

ans =

     0

exfun('#')

ans =

     1

floor(3.1)

ans =

     3

floor(-3.1)

ans =

    -4

ceil(3.1)

ans =

     4

ceil(-3.1)

ans =

    -3

round(3.1)

ans =

     3

round(3.6)

ans =

     4

integer(3.1)
{Undefined function 'integer' for input arguments of
type 'double'.
} 
int(3.1)
{Undefined function 'int' for input arguments of type
'double'.
} 
int16(3.1)

ans =

      3

int16(-3.1)

ans =

     -3

exfun2(4)

ans =

     0

help exfun2
  exfun2.m 
  
  This is another example function.
  Returns both the sin and cos of the input.
  -MCW
 
  Usage:
    [sinval, cosval] = exfun2(5)

[sinval, cosval] = exfun2(5)

sinval =

  -0.958924274663138


cosval =

   0.283662185463226

help exfun3
  exfun3.m 
  
  This is another example function.
  multiple inputs
  -MCW
 
  Usage:
    out = exfun3(sinval, cosval)

a = exfun3(sinval, cosval)

a =

  16.927989444555315

a = exfun3(sinval, 0)

a =

  17.199999999999999

a = exfun4(sinval, 0)
{Error: <a href="matlab: opentoline('/Users/mweeks/Documents/MATLAB/exfun4.m',10,15)">File: exfun4.m Line: 10 Column: 15
</a>Expression or statement is incorrect--possibly
unbalanced (, {, or [.
} 
[a,b] = exfun4(sinval, 0)
{Error: <a href="matlab: opentoline('/Users/mweeks/Documents/MATLAB/exfun4.m',10,15)">File: exfun4.m Line: 10 Column: 15
</a>Expression or statement is incorrect--possibly
unbalanced (, {, or [.
} 
[a,b] = exfun4(sinval, 0)

a =

  17.199999999999999


b =

   4.171340851085623

c = [1 3 5 7]

c =

     1     3     5     7

c = [1 +3 5 7]

c =

     1     3     5     7

c = [1 + 3 5 7]

c =

     4     5     7

c = [1 +3j 5 7]

c =

  Column 1

  1.000000000000000 + 0.000000000000000i

  Column 2

  0.000000000000000 + 3.000000000000000i

  Column 3

  5.000000000000000 + 0.000000000000000i

  Column 4

  7.000000000000000 + 0.000000000000000i

c = [1 + 3j 5 7]

c =

  Column 1

  1.000000000000000 + 3.000000000000000i

  Column 2

  5.000000000000000 + 0.000000000000000i

  Column 3

  7.000000000000000 + 0.000000000000000i

c = [1 + 3j, 5, 7]

c =

  Column 1

  1.000000000000000 + 3.000000000000000i

  Column 2

  5.000000000000000 + 0.000000000000000i

  Column 3

  7.000000000000000 + 0.000000000000000i

whos
  Name        Size            Bytes  Class     Attributes

  a           1x1                 8  double              
  ans         1x1                 8  double              
  b           1x1                 8  double              
  c           1x3                48  double    complex   
  cosval      1x1                 8  double              
  d           1x1                 1  uint8               
  f           1x1                 8  double              
  sinval      1x1                 8  double              

[a,b] = exfun4(sinval, 0)
  Name      Size            Bytes  Class     Attributes

  c         1x1                 8  double              
  out1      1x1                 8  double              
  out2      1x1                 8  double              
  s         1x1                 8  double              


a =

  17.199999999999999


b =

   4.171340851085623

type exfun4.m

% exfun4.m 
% 
% This is another example function.
% multiple inputs, multiple outputs
% -MCW
%
% Usage:
%   [out1, out2] = exfun4(sinval, cosval)

function [out1, out2] = exfun4(s, c)

out1 = s * c + 17.2;
out2 = (c - 4) / s;
val3 = 31;

whos
[a,b] = exfun4(sinval, 0)
  Name      Size            Bytes  Class     Attributes

  c         1x1                 8  double              
  out1      1x1                 8  double              
  out2      1x1                 8  double              
  s         1x1                 8  double              
  val3      1x1                 8  double              


a =

  17.199999999999999


b =

   4.171340851085623

whos
  Name        Size            Bytes  Class     Attributes

  a           1x1                 8  double              
  ans         1x1                 8  double              
  b           1x1                 8  double              
  c           1x3                48  double    complex   
  cosval      1x1                 8  double              
  d           1x1                 1  uint8               
  f           1x1                 8  double              
  sinval      1x1                 8  double              

example_switch
a is less than b
four
???
a is unknown value
three
four
five
six or seven
five
six or seven
five
six or seven
???
a is unknown value
a less
a 6  b 5  c 8
a between b and c
whos
  Name        Size            Bytes  Class     Attributes

  a           1x1                 8  double              
  ans         1x1                 8  double              
  b           1x1                 8  double              
  c           1x1                 8  double              
  cosval      1x1                 8  double              
  d           1x1                 1  uint8               
  f           1x1                 8  double              
  sinval      1x1                 8  double              

clear
whos
example_switch
a is less than b
four
???
a is unknown value
three
four
five
six or seven
five
six or seven
five
six or seven
???
a is unknown value
a less
a 6  b 5  c 8
a between b and c
whos
  Name      Size            Bytes  Class     Attributes

  a         1x1                 8  double              
  b         1x1                 8  double              
  c         1x1                 8  double              

type script1.m

% script1.m
%


f = a * 4;
disp(f);
clear
whos
script1
{Undefined function or variable 'a'.

Error in <a href="matlab:helpUtils.errorDocCallback('script1', '/Users/mweeks/Documents/MATLAB/script1.m', 5)" style="font-weight:bold">script1</a> (<a href="matlab: opentoline('/Users/mweeks/Documents/MATLAB/script1.m',5,0)">line 5</a>)
f = a * 4;
} 
a = 7

a =

     7

script1
    28

script1
    28

  Name      Size            Bytes  Class     Attributes

  a         1x1                 8  double              
  f         1x1                 8  double              

whos
  Name      Size            Bytes  Class     Attributes

  a         1x1                 8  double              
  f         1x1                 8  double              

[a,b] = exfun4(sinval, 0)
{Undefined function or variable 'sinval'.
} 
[a,b] = exfun4(0.3, 0)
{Undefined function or variable 'a'.

Error in <a href="matlab:helpUtils.errorDocCallback('exfun4', '/Users/mweeks/Documents/MATLAB/exfun4.m', 14)" style="font-weight:bold">exfun4</a> (<a href="matlab: opentoline('/Users/mweeks/Documents/MATLAB/exfun4.m',14,0)">line 14</a>)
val2 = a
} 
out1
{Undefined function or variable 'out1'.
} 
s = 0.3

s =

   0.300000000000000

c = 0;
exfun4

val2 =

     7

  Name      Size            Bytes  Class     Attributes

  a         1x1                 8  double              
  c         1x1                 8  double              
  f         1x1                 8  double              
  out1      1x1                 8  double              
  out2      1x1                 8  double              
  s         1x1                 8  double              
  val2      1x1                 8  double              
  val3      1x1                 8  double              

exfun4
{Undefined function or variable 'idontexist'.

Error in <a href="matlab:helpUtils.errorDocCallback('exfun4', '/Users/mweeks/Documents/MATLAB/exfun4.m', 14)" style="font-weight:bold">exfun4</a> (<a href="matlab: opentoline('/Users/mweeks/Documents/MATLAB/exfun4.m',14,0)">line 14</a>)
val2 = idontexist
} 
out1

out1 =

  17.199999999999999

out2

out2 =

 -13.333333333333334

clear
clc
type exfun4.m

% exfun4.m 
% 
% This is another example function.
% multiple inputs, multiple outputs
% -MCW
%
% Usage:
%   [out1, out2] = exfun4(sinval, cosval)

%function [out1, out2] = exfun4(s, c)

out1 = s * c + 17.2;
out2 = (c - 4) / s;
val2 = idontexist
val3 = 31;

whos
c = 0;
s = 0.3

s =

   0.300000000000000

exfun4
{Undefined function or variable 'idontexist'.

Error in <a href="matlab:helpUtils.errorDocCallback('exfun4', '/Users/mweeks/Documents/MATLAB/exfun4.m', 14)" style="font-weight:bold">exfun4</a> (<a href="matlab: opentoline('/Users/mweeks/Documents/MATLAB/exfun4.m',14,0)">line 14</a>)
val2 = idontexist
} 
whos
  Name      Size            Bytes  Class     Attributes

  c         1x1                 8  double              
  out1      1x1                 8  double              
  out2      1x1                 8  double              
  s         1x1                 8  double              

[a,b] = exfun4(0.3, 0)
  Name      Size            Bytes  Class     Attributes

  c         1x1                 8  double              
  out1      1x1                 8  double              
  out2      1x1                 8  double              
  s         1x1                 8  double              
  val3      1x1                 8  double              


a =

  17.199999999999999


b =

 -13.333333333333334

% we talked about functions versus scripts
% modular
% scope
diary off