t=[0:2:100]

t =

  Columns 1 through 11

     0     2     4     6     8    10    12    14    16    18    20

  Columns 12 through 22

    22    24    26    28    30    32    34    36    38    40    42

  Columns 23 through 33

    44    46    48    50    52    54    56    58    60    62    64

  Columns 34 through 44

    66    68    70    72    74    76    78    80    82    84    86

  Columns 45 through 51

    88    90    92    94    96    98   100

clear
t=[0:2:100];
x=10+exp(-0.2618*t)

x =

  Columns 1 through 6

   11.0000   10.5924   10.3509   10.2079   10.1231   10.0729

  Columns 7 through 12

   10.0432   10.0256   10.0152   10.0090   10.0053   10.0032

  Columns 13 through 18

   10.0019   10.0011   10.0007   10.0004   10.0002   10.0001

  Columns 19 through 24

   10.0001   10.0000   10.0000   10.0000   10.0000   10.0000

  Columns 25 through 30

   10.0000   10.0000   10.0000   10.0000   10.0000   10.0000

  Columns 31 through 36

   10.0000   10.0000   10.0000   10.0000   10.0000   10.0000

  Columns 37 through 42

   10.0000   10.0000   10.0000   10.0000   10.0000   10.0000

  Columns 43 through 48

   10.0000   10.0000   10.0000   10.0000   10.0000   10.0000

  Columns 49 through 51

   10.0000   10.0000   10.0000

clear
t=[0:2:100];
x=10+exp(-0.2618*t);
Q=[-14.4721 10 -5.5279; 8.9443 -10 -8.9443; -5.5279 10 -14.4721];
x=10+Q*exp(-0.2618*t);
{Error using <a href="matlab:matlab.internal.language.introspective.errorDocCallback('mtimes')" style="font-weight:bold"> * </a>
Incorrect dimensions for matrix multiplication. Check that the
number of columns in the first matrix matches the number of rows in
the second matrix. To perform elementwise multiplication, use '.*'.
} 
x=10+Q.*exp(-0.2618*t);
{Matrix dimensions must agree.
} 
x=10+Q[1:].*exp(-0.2618*t);
 x=10+Q[1:].*exp(-0.2618*t);
       ↑
{Error: Invalid expression. When calling a function or indexing a
variable, use parentheses. Otherwise, check for mismatched
delimiters.
} 
x=10+Q[:1].*exp(-0.2618*t);
 x=10+Q[:1].*exp(-0.2618*t);
       ↑
{Error: Invalid expression. When calling a function or indexing a
variable, use parentheses. Otherwise, check for mismatched
delimiters.
} 
x=10+Q.*exp(-0.2618*t);
{Matrix dimensions must agree.
} 
x=10+Q(:,1).*exp(-0.2618*t);
plot(t,x)
x=10+Q(1,:).*exp(-0.2618*t);
{Matrix dimensions must agree.
} 
x=10+Q(:,1).*exp(-0.2618*t);
plot(t,x)
clear x
x=10+Q(:,1).*exp(-0.2618*t);
clear x
Q(:,1)

ans =

  -14.4721
    8.9443
   -5.5279

x=10+Q(:,1)*exp(-0.2618*t);
x=10+Q(1,:)*exp(-0.2618*t);
{Error using <a href="matlab:matlab.internal.language.introspective.errorDocCallback('mtimes')" style="font-weight:bold"> * </a>
Incorrect dimensions for matrix multiplication. Check that the
number of columns in the first matrix matches the number of rows
in the second matrix. To perform elementwise multiplication, use
'.*'.
} 
x=10+Q(:,1)*exp(-0.2618*t);
plot(t,x)
x=10+Q(1)*exp(-0.2618*t);
Q(1)

ans =

  -14.4721

x=10+Q(1)*exp(-0.2618*t)+Q(2)*exp(-0.2618*t)+Q(3)*exp(-0.2618*t);
plot(t,x)
F=-.2618; x=10+Q(1)*exp(F*t)+Q(2)*exp(F*t)+Q(3)*exp(F*t);
plot(t,x);
hold on;
F=-.2618, y=3; y=10+Q(y+1)*exp(F*t)+Q(y+2)*exp(F*t)+Q(y+3)*exp(F*t);

F =

   -0.2618

F=-.2618; y=3; y=10+Q(y+1)*exp(F*t)+Q(y+2)*exp(F*t)+Q(y+3)*exp(F*t);
plot(t,y)
F=-0.2; y=3; y=10+Q(y+1)*exp(F*t)+Q(y+2)*exp(F*t)+Q(y+3)*exp(F*t);
plot(t,y)
hold off
plot(t,x)
Q(4)

ans =

    10

Q(3
 Q(3
    ↑
{Error: Invalid expression. When calling a function or indexing a
variable, use parentheses. Otherwise, check for mismatched
delimiters.
} 
Q(3)

ans =

   -5.5279

Q(0)
{Array indices must be positive integers or logical values.
} 
Q(4)

ans =

    10

Q(5)

ans =

   -10

Q(6)

ans =

    10

Q(7)

ans =

   -5.5279

Q(8)

ans =

   -8.9443

Q(9)

ans =

  -14.4721

Q(10)
{Index exceeds array bounds.
} 
Q(5)

ans =

   -10

Q(6)

ans =

    10

F=-0.2; y=3; y=10+Q(y,1)*exp(F*t)+Q(y,2)*exp(F*t)+Q(y,3)*exp(F*t);
F=-0.2; y=0; x=10+Q(y,1)*exp(F*t)+Q(y,2)*exp(F*t)+Q(y,3)*exp(F*t);
{Index in position 1 is invalid. Array indices must be positive
integers or logical values.
} 
F=-0.2; y=1; x=10+Q(y,1)*exp(F*t)+Q(y,2)*exp(F*t)+Q(y,3)*exp(F*t);
F=-0.2618; y=1; x=10+Q(y,1)*exp(F*t)+Q(y,2)*exp(F*t)+Q(y,3)*exp(F*t);
plot(t,x)
hold on;
F=-0.2; y=2; x=10+Q(y,1)*exp(F*t)+Q(y,2)*exp(F*t)+Q(y,3)*exp(F*t);
plot(t,y)
F=-0.2618; y=1; x=10+Q(y,1)*exp(F*t)+Q(y,2)*exp(F*t)+Q(y,3)*exp(F*t);
F=-0.2; y=2; y=10+Q(y,1)*exp(F*t)+Q(y,2)*exp(F*t)+Q(y,3)*exp(F*t);
plot(t,y)
clear plot
F=-0.2618; y=1; x=10+Q(y,1)*exp(F*t)+Q(y,2)*exp(F*t)+Q(y,3)*exp(F*t);
F=-0.2618; z=2; y=10+Q(z,1)*exp(F*t)+Q(z,2)*exp(F*t)+Q(z,3)*exp(F*t);
F=-0.2; z=2; y=10+Q(z,1)*exp(F*t)+Q(z,2)*exp(F*t)+Q(z,3)*exp(F*t);
plot(t,y)
plot(t,x)
hold onl
{Error using <a href="matlab:matlab.internal.language.introspective.errorDocCallback('hold', '/soft/MATLAB/R2018a/toolbox/matlab/graphics/hold.m', 83)" style="font-weight:bold">hold</a> (<a href="matlab: opentoline('/soft/MATLAB/R2018a/toolbox/matlab/graphics/hold.m',83,0)">line 83</a>)
Unknown command option.
} 
hold on
plot(t,y)
F=-0.2; z=2; y=10+Q(z,1)*exp(F*t)+Q(z,2)*exp(F*t)+Q(z,3)*exp(F*t);
Q(2,1)

ans =

    8.9443

F=-0.2; z=2; y=10+Q(z,1)*exp(F*t)+Q(z,2)*exp(F*t)+Q(z,3)*exp(F*t);
F=-0.2; a=2; z=10+Q(a,1)*exp(F*t)+Q(a,2)*exp(F*t)+Q(a,3)*exp(F*t);
F=-0.0382; a=3; z=10+Q(a,1)*exp(F*t)+Q(a,2)*exp(F*t)+Q(a,3)*exp(F*t);
plot (t,z)
clear plot;
plot (t,x)
plot (t,z)
plot (t,x)
hold on
plot (t,z)
F=-0.2; z=2; y=10+Q(z,1)*exp(F*t)+Q(z,2)*exp(F*t)+Q(z,3)*exp(F*t);
plot(t,y)
plot(t,x); plot(t,y) plot(t,z)
 plot(t,x); plot(t,y) plot(t,z)
                      ↑
{Error: Invalid expression. Check for missing multiplication
operator, missing or unbalanced delimiters, or other syntax
error. To construct matrices, use brackets instead of
parentheses.
} 
plot(t,x); plot(t,y); plot(t,z)
clear plot
plot(t,x); hold on; plot(t,y); plot(t,z)
plot(t,x); plot(t,y); plot(t,z)
hold on
plot(t,x); plot(t,y); plot(t,z)
F=-0.2; z=2; y=10+Q(z,1)*exp(F*t)+Q(z,2)*exp(F*t)+Q(z,3)*exp(F*t);
plot(t,x); plot(t,y); plot(t,z)
F=-0.0382; a=3; z=10+Q(a,1)*exp(F*t)+Q(a,2)*exp(F*t)+Q(a,3)*exp(F*t);
plot(t,x); plot(t,y); plot(t,z)
hold on;
plot(t,x); plot(t,y); plot(t,z)
F=-0.0382; z=10+Q(a,1)*exp(-.2618*t)+Q(a,2)*exp(-.2*t)+Q(a,3)*exp(-.0382*t);
a=1; z=10+Q(a,1)*exp(-.2618*t)+Q(a,2)*exp(-.2*t)+Q(a,3)*exp(-.0382*t);
a=1; x=10+Q(a,1)*exp(-.2618*t)+Q(a,2)*exp(-.2*t)+Q(a,3)*exp(-.0382*t);
a=2; y=10+Q(a,1)*exp(-.2618*t)+Q(a,2)*exp(-.2*t)+Q(a,3)*exp(-.0382*t);
a=3; z=10+Q(a,1)*exp(-.2618*t)+Q(a,2)*exp(-.2*t)+Q(a,3)*exp(-.0382*t);
hold on;
plot(t,x); plot(t,y); plot(t,z)
plot(t,x,'b:s'); plot(t,y,'r:p'); plot(t,z,'g,t')
{Error using <a href="matlab:matlab.internal.language.introspective.errorDocCallback('plot')" style="font-weight:bold">plot</a>
Error in color/linetype argument.
} 
plot(t,x,'b:s'); plot(t,y,'r:p'); plot(t,z,'g,o')
{Error using <a href="matlab:matlab.internal.language.introspective.errorDocCallback('plot')" style="font-weight:bold">plot</a>
Error in color/linetype argument.
} 
plot(t,x,'b:s'); plot(t,y,'r:p'); plot(t,z,'-o')
t.label("time")
{Dot indexing is not supported for variables of this type.
} 
t.label('time')
{Dot indexing is not supported for variables of this type.
} 
x.label('time')
{Dot indexing is not supported for variables of this type.
} 
xlabel('time')
xlabel('Time')
ylabel('Amount of salt')
xlabel('Time (seconds)')
xlabel('Time (min)')
plot(t,x,'b:s'); plot(t,y,'r:p'); plot(t,z,'-o')
xlabel('Time (min)')
ylabel('Amount of salt')
hold on;
plot(t,x,'b:s'); plot(t,y,'r:p'); plot(t,z,'-o')
xlabel('Time (min)')
ylabel('Amount of salt')