A = [2 6; 3 9];
B= [1 2 ; 3 4];
C= [-5 5; 5 3];
G=blkdiag(A,B,C)
G =
     2     6     0     0     0     0
     3     9     0     0     0     0
     0     0     1     2     0     0
     0     0     3     4     0     0
     0     0     0     0    -5     5
     0     0     0     0     5     3
clear G
G = (vertcat(A,[],[]); vertcat([],B,[]), vertcat([],[],C))
??? G = (vertcat(A,[],[]); vertcat([],B,[]), vertcat([],[],C))
                         |
{Error: Unbalanced or unexpected parenthesis or
bracket.
} 
G = [vertcat(A,[],[]); vertcat([],B,[]); vertcat([],[],C)]
G =
     2     6
     3     9
     1     2
     3     4
    -5     5
     5     3
G = [vertcat(A,zeros([4,2]); vertcat(zeros(2),B,zeros(2)); vertcat(zeros([4,2],C)]
??? G = [vertcat(A,zeros([4,2]); vertcat(zeros(2),B,zeros(2)); vertcat(zeros([4,2],C)]
                               |
{Error: Unbalanced or unexpected parenthesis or
bracket.
} 
G = [vertcat(A,zeros([4,2])); vertcat(zeros(2),B,zeros(2)); vertcat(zeros([4,2],C))]
{Warning: Input arguments must be scalar.} 
{Warning: Input arguments must be scalar.} 
{Warning: Concatenation involves an empty array
with an incorrect number of columns.
This may not be allowed in a future release.} 
G =
     2     6
     3     9
     0     0
     0     0
     0     0
     0     0
     0     0
     0     0
     1     2
     3     4
     0     0
     0     0
G = [vertcat(A,zeros([4,2])); vertcat(zeros(2),B,zeros(2)); vertcat(zeros([4,2],C))]
{Warning: Input arguments must be scalar.} 
{Warning: Input arguments must be scalar.} 
{Warning: Concatenation involves an empty array
with an incorrect number of columns.
This may not be allowed in a future release.} 
G =
     2     6
     3     9
     0     0
     0     0
     0     0
     0     0
     0     0
     0     0
     1     2
     3     4
     0     0
     0     0
G = [horzcat(A,zeros(2),zeros(2)); horzcat(zeros(2),B,zeros(2)); horzcat(zeros(2),zeros(2),C)]
G =
     2     6     0     0     0     0
     3     9     0     0     0     0
     0     0     1     2     0     0
     0     0     3     4     0     0
     0     0     0     0    -5     5
     0     0     0     0     5     3
G = vertcat[horzcat(A,zeros(2),zeros(2)); horzcat(zeros(2),B,zeros(2)); horzcat(zeros(2),zeros(2),C)]
??? G = vertcat[horzcat(A,zeros(2),zeros(2)); horzcat(zeros(2),B,zeros(2)); horzcat(zeros(2),zeros(2),C)]
               |
{Error: Unbalanced or unexpected parenthesis or bracket.
} 
G = vertcat(horzcat(A,zeros(2),zeros(2)); horzcat(zeros(2),B,zeros(2)); horzcat(zeros(2),zeros(2),C))
??? G = vertcat(horzcat(A,zeros(2),zeros(2)); horzcat(zeros(2),B,zeros(2)); horzcat(zeros(2),zeros(2),C))
                                            |
{Error: Unbalanced or unexpected parenthesis or bracket.
} 
G = vertcat(horzcat(A,zeros(2),zeros(2)), horzcat(zeros(2),B,zeros(2)), horzcat(zeros(2),zeros(2),C))
G =
     2     6     0     0     0     0
     3     9     0     0     0     0
     0     0     1     2     0     0
     0     0     3     4     0     0
     0     0     0     0    -5     5
     0     0     0     0     5     3
G = cat(1,horzcat(A,zeros(2),zeros(2)), horzcat(zeros(2),B,zeros(2)), horzcat(zeros(2),zeros(2),C))
G =
     2     6     0     0     0     0
     3     9     0     0     0     0
     0     0     1     2     0     0
     0     0     3     4     0     0
     0     0     0     0    -5     5
     0     0     0     0     5     3
G = cat(2,vertcat(A,zeros(2),zeros(2)), vertcat(zeros(2),B,zeros(2)), vertcat(zeros(2),zeros(2),C))
G =
     2     6     0     0     0     0
     3     9     0     0     0     0
     0     0     1     2     0     0
     0     0     3     4     0     0
     0     0     0     0    -5     5
     0     0     0     0     5     3
G = horzcat(vertcat(A,zeros(2),zeros(2)), vertcat(zeros(2),B,zeros(2)), vertcat(zeros(2),zeros(2),C))
G =
     2     6     0     0     0     0
     3     9     0     0     0     0
     0     0     1     2     0     0
     0     0     3     4     0     0
     0     0     0     0    -5     5
     0     0     0     0     5     3
G(6,:)=[]
G =
     2     6     0     0     0     0
     3     9     0     0     0     0
     0     0     1     2     0     0
     0     0     3     4     0     0
     0     0     0     0    -5     5
G(:,6)=[]
G =
     2     6     0     0     0
     3     9     0     0     0
     0     0     1     2     0
     0     0     3     4     0
     0     0     0     0    -5
G_1 = G(1:2,1:2)
G_1 =
     2     6
     3     9
G(5,5)=4
G =
     2     6     0     0     0
     3     9     0     0     0
     0     0     1     2     0
     0     0     3     4     0
     0     0     0     0     4
G(13)
ans =
     1
G(12,1)
{??? Index exceeds matrix dimensions.
} 
A= rand(10.10)
{Warning: Size vector should be a row vector with integer elements.} 
A =
  Columns 1 through 7
    0.8147    0.1576    0.6557    0.7060    0.4387    0.2760    0.7513
    0.9058    0.9706    0.0357    0.0318    0.3816    0.6797    0.2551
    0.1270    0.9572    0.8491    0.2769    0.7655    0.6551    0.5060
    0.9134    0.4854    0.9340    0.0462    0.7952    0.1626    0.6991
    0.6324    0.8003    0.6787    0.0971    0.1869    0.1190    0.8909
    0.0975    0.1419    0.7577    0.8235    0.4898    0.4984    0.9593
    0.2785    0.4218    0.7431    0.6948    0.4456    0.9597    0.5472
    0.5469    0.9157    0.3922    0.3171    0.6463    0.3404    0.1386
    0.9575    0.7922    0.6555    0.9502    0.7094    0.5853    0.1493
    0.9649    0.9595    0.1712    0.0344    0.7547    0.2238    0.2575
  Columns 8 through 10
    0.8407    0.3517    0.0759
    0.2543    0.8308    0.0540
    0.8143    0.5853    0.5308
    0.2435    0.5497    0.7792
    0.9293    0.9172    0.9340
    0.3500    0.2858    0.1299
    0.1966    0.7572    0.5688
    0.2511    0.7537    0.4694
    0.6160    0.3804    0.0119
    0.4733    0.5678    0.3371
A= rand(10,10)
A =
  Columns 1 through 7
    0.1622    0.4505    0.1067    0.4314    0.8530    0.4173    0.7803
    0.7943    0.0838    0.9619    0.9106    0.6221    0.0497    0.3897
    0.3112    0.2290    0.0046    0.1818    0.3510    0.9027    0.2417
    0.5285    0.9133    0.7749    0.2638    0.5132    0.9448    0.4039
    0.1656    0.1524    0.8173    0.1455    0.4018    0.4909    0.0965
    0.6020    0.8258    0.8687    0.1361    0.0760    0.4893    0.1320
    0.2630    0.5383    0.0844    0.8693    0.2399    0.3377    0.9421
    0.6541    0.9961    0.3998    0.5797    0.1233    0.9001    0.9561
    0.6892    0.0782    0.2599    0.5499    0.1839    0.3692    0.5752
    0.7482    0.4427    0.8001    0.1450    0.2400    0.1112    0.0598
  Columns 8 through 10
    0.2348    0.5470    0.9294
    0.3532    0.2963    0.7757
    0.8212    0.7447    0.4868
    0.0154    0.1890    0.4359
    0.0430    0.6868    0.4468
    0.1690    0.1835    0.3063
    0.6491    0.3685    0.5085
    0.7317    0.6256    0.5108
    0.6477    0.7802    0.8176
    0.4509    0.0811    0.7948
A = A.*100;
round(A)
ans =
    16    45    11    43    85    42    78    23    55    93
    79     8    96    91    62     5    39    35    30    78
    31    23     0    18    35    90    24    82    74    49
    53    91    77    26    51    94    40     2    19    44
    17    15    82    15    40    49    10     4    69    45
    60    83    87    14     8    49    13    17    18    31
    26    54     8    87    24    34    94    65    37    51
    65   100    40    58    12    90    96    73    63    51
    69     8    26    55    18    37    58    65    78    82
    75    44    80    14    24    11     6    45     8    79
A(find(A<10)=0
??? A(find(A<10)=0
                |
{Error: The expression to the left of the equals sign is not a valid target for
an assignment.
} 
A(find(A<10))=0
A =
  Columns 1 through 7
   16.2182   45.0542   10.6653   43.1414   85.3031   41.7267   78.0252
   79.4285         0   96.1898   91.0648   62.2055         0   38.9739
   31.1215   22.8977         0   18.1847   35.0952   90.2716   24.1691
   52.8533   91.3337   77.4910   26.3803   51.3250   94.4787   40.3912
   16.5649   15.2378   81.7303   14.5539   40.1808   49.0864         0
   60.1982   82.5817   86.8695   13.6069         0   48.9253   13.1973
   26.2971   53.8342         0   86.9292   23.9916   33.7719   94.2051
   65.4079   99.6135   39.9783   57.9705   12.3319   90.0054   95.6135
   68.9215         0   25.9870   54.9860   18.3908   36.9247   57.5209
   74.8152   44.2678   80.0068   14.4955   23.9953   11.1203         0
  Columns 8 through 10
   23.4780   54.7009   92.9386
   35.3159   29.6321   77.5713
   82.1194   74.4693   48.6792
         0   18.8955   43.5859
         0   68.6775   44.6784
   16.8990   18.3511   30.6349
   64.9115   36.8485   50.8509
   73.1722   62.5619   51.0772
   64.7746   78.0227   81.7628
   45.0924         0   79.4831
A = round(A)
A =
    16    45    11    43    85    42    78    23    55    93
    79     0    96    91    62     0    39    35    30    78
    31    23     0    18    35    90    24    82    74    49
    53    91    77    26    51    94    40     0    19    44
    17    15    82    15    40    49     0     0    69    45
    60    83    87    14     0    49    13    17    18    31
    26    54     0    87    24    34    94    65    37    51
    65   100    40    58    12    90    96    73    63    51
    69     0    26    55    18    37    58    65    78    82
    75    44    80    14    24    11     0    45     0    79
A(find(A>90))=inf
A =
    16    45    11    43    85    42    78    23    55   Inf
    79     0   Inf   Inf    62     0    39    35    30    78
    31    23     0    18    35    90    24    82    74    49
    53   Inf    77    26    51   Inf    40     0    19    44
    17    15    82    15    40    49     0     0    69    45
    60    83    87    14     0    49    13    17    18    31
    26    54     0    87    24    34   Inf    65    37    51
    65   Inf    40    58    12    90   Inf    73    63    51
    69     0    26    55    18    37    58    65    78    82
    75    44    80    14    24    11     0    45     0    79
v = A(find(A>=30 & A <=60))
v =
    31
    53
    60
    45
    54
    44
    40
    43
    58
    55
    35
    51
    40
    42
    49
    49
    34
    37
    39
    40
    58
    35
    45
    55
    30
    37
    49
    44
    45
    31
    51
    51
A = [1 0 ; 2 1];
B = [2 1 ; 1 0];
B = [1 2 ; 0 1];
A*B
ans =
     1     2
     2     5
B*A
ans =
     5     2
     2     1
v=[1:100];
Cmat=reshape(v,10,10)
Cmat =
     1    11    21    31    41    51    61    71    81    91
     2    12    22    32    42    52    62    72    82    92
     3    13    23    33    43    53    63    73    83    93
     4    14    24    34    44    54    64    74    84    94
     5    15    25    35    45    55    65    75    85    95
     6    16    26    36    46    56    66    76    86    96
     7    17    27    37    47    57    67    77    87    97
     8    18    28    38    48    58    68    78    88    98
     9    19    29    39    49    59    69    79    89    99
    10    20    30    40    50    60    70    80    90   100
S=sum(Cmat)
S =
    55   155   255   355   455   555   655   755   855   955
E=[13 -1 5; -22 10 -87]
E =
    13    -1     5
   -22    10   -87
mean(E,2)
ans =
    5.6667
  -33.0000
E(1,:)=ones
E =
     1     1     1
   -22    10   -87
C = Cmat(2:9,2:9)
C =
  Columns 1 through 7
    12    22    32    42    52    62    72
    13    23    33    43    53    63    73
    14    24    34    44    54    64    74
    15    25    35    45    55    65    75
    16    26    36    46    56    66    76
    17    27    37    47    57    67    77
    18    28    38    48    58    68    78
    19    29    39    49    59    69    79
  Column 8
    82
    83
    84
    85
    86
    87
    88
    89
v = [1:20];
v(1:2:end)=-v(1:2:end)
v =
  Columns 1 through 7
    -1     2    -3     4    -5     6    -7
  Columns 8 through 14
     8    -9    10   -11    12   -13    14
  Columns 15 through 20
   -15    16   -17    18   -19    20
v(2:2:end)=-v(2:2:end)
v =
  Columns 1 through 7
    -1    -2    -3    -4    -5    -6    -7
  Columns 8 through 14
    -8    -9   -10   -11   -12   -13   -14
  Columns 15 through 20
   -15   -16   -17   -18   -19   -20
v = [1:20];
v(2:2:end)=-v(2:2:end)
v =
  Columns 1 through 7
     1    -2     3    -4     5    -6     7
  Columns 8 through 14
    -8     9   -10    11   -12    13   -14
  Columns 15 through 20
    15   -16    17   -18    19   -20
v=rand(1,15)
v =
  Columns 1 through 4
    0.6443    0.3786    0.8116    0.5328
  Columns 5 through 8
    0.3507    0.9390    0.8759    0.5502
  Columns 9 through 12
    0.6225    0.5870    0.2077    0.3012
  Columns 13 through 15
    0.4709    0.2305    0.8443
v(find(v<0.5))=0.0
v =
  Columns 1 through 4
    0.6443         0    0.8116    0.5328
  Columns 5 through 8
         0    0.9390    0.8759    0.5502
  Columns 9 through 12
    0.6225    0.5870         0         0
  Columns 13 through 15
         0         0    0.8443
A=[1:3]
A =
     1     2     3
B=[2 4 8]
B =
     2     4     8
B=[2 4 8]'
B =
     2
     4
     8
A*B
ans =
    34
B*A
ans =
     2     4     6
     4     8    12
     8    16    24
A'*B'
ans =
     2     4     8
     4     8    16
     6    12    24
(A')*(B')
ans =
     2     4     8
     4     8    16
     6    12    24
randint(5,6,[-100,100])
ans =
   -61   -38    96    19   -77   -83
   -55    85   -12   -48   -41   -48
   -66   -14   -78    21   -36    61
   -55   -63   -49    42   -15   -95
   -13    81   -18   -56     2    86
A = randint(5,6,[-100,100]);
A = sortrows(A)
A =
   -53   -54   -27    60   -73    56
    -8    -2    98   -81    44    43
    -2     9    36    77   -33    31
    16     4   -21    83    36    -1
    46    93    25   -93   -48   -79
A= sortcols(A)
{??? Undefined function or method
'sortcols' for input arguments of
type 'double'.
} 
clear(A)
{??? Error using ==> clear
Argument must contain a string.
} 
clearA
{??? Undefined function or variable
'clearA'.
} 
clear A
A = randint(5,6,[-100,100]);
A=sort(A)
A =
   -61   -94    15   -95   -67   -92
   -33    -4    22   -64    -6   -89
    40     0    24   -52     0   -86
    79    49    61    -2    43     4
    81    81    72    78    96    37
A=sortrows(A)
A =
   -61   -94    15   -95   -67   -92
   -33    -4    22   -64    -6   -89
    40     0    24   -52     0   -86
    79    49    61    -2    43     4
    81    81    72    78    96    37
clear A
A = randint(5,6,[-100,100]);
A=sort(A,2)
A =
   -81   -66   -42   -20    -9    32
   -22   -14   -14     4     5    64
   -97   -17    64    65    67    95
   -84    30    32    45    61    97
   -88   -74   -70   -67    26    60
A=sortrows(A)
A =
   -97   -17    64    65    67    95
   -88   -74   -70   -67    26    60
   -84    30    32    45    61    97
   -81   -66   -42   -20    -9    32
   -22   -14   -14     4     5    64
clear A
A = randint(5,6,[-100,100]);
sort(A,1)
ans =
   -79   -90   -17   -40   -75   -94
   -61   -46   -16     8   -66   -62
   -32    48    10    33   -65    12
   -26    84    89    40    33    34
    -2    91    97    40   100    77
sort(A,2)
ans =
   -94   -79   -40   -16    33    91
   -65   -26    10    12    40    84
   -90   -75   -61    33    77    89
   -17    -2     8    34    48   100
   -66   -62   -46   -32    40    97
diary off
a=[-1 0 3]
a =
    -1     0     3
b = [0 3 1]
b =
     0     3     1
~a
ans =
     0     1     0
a&b
ans =
     0     0     1
a|b
ans =
     1     1     1
a>0 & b>0
ans =
     0     0     1
a>0 | b>0
ans =
     0     1     1
~a>0
ans =
     0     1     0
~a>b
ans =
     0     0     0
~(a>b)
ans =
     1     1     0
diary on
diary 'hw_2_1'
