MATLAB: How can I generate a random matrix

functionrandreshape

hello guys, what code can i use to generate a mxn matrix provided that the value is from 1 to x(depending on the desire of user) and the values should be unique from each other. 🙂

Best Answer

You will of course have to make sure that x==m*n, as you describe it.

f = @(x,m,n) reshape(randperm(x),m,n);
f(20,5,4)
ans =
       4     9    12     2
      17     1     8    16
      19     7     6    18
       5     3    14    13
      20    11    15    10

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MATLAB: What do three inputs mean in a Matrix x(m,n,1)

It creates a (3*m x n) vertically concatenated matrix of the three ‘pages’ of the 3D matrix ‘x’.

MATLAB: Create matrix with periodic increments

The function bsxfun is really handy for these kind of tasks:

>> X = [1;2;3;4;5;6];
>> Y = bsxfun(@plus,X,0:10:40);
>> Z = bsxfun(@plus,Y(:),0:20);
>> Z
Z =
    1    2    3    4    5    6    7    8    9   10   11   12   13   14   15   16   17   18   19   20   21
    2    3    4    5    6    7    8    9   10   11   12   13   14   15   16   17   18   19   20   21   22
    3    4    5    6    7    8    9   10   11   12   13   14   15   16   17   18   19   20   21   22   23
    4    5    6    7    8    9   10   11   12   13   14   15   16   17   18   19   20   21   22   23   24
    5    6    7    8    9   10   11   12   13   14   15   16   17   18   19   20   21   22   23   24   25
    6    7    8    9   10   11   12   13   14   15   16   17   18   19   20   21   22   23   24   25   26
   11   12   13   14   15   16   17   18   19   20   21   22   23   24   25   26   27   28   29   30   31
   12   13   14   15   16   17   18   19   20   21   22   23   24   25   26   27   28   29   30   31   32
   13   14   15   16   17   18   19   20   21   22   23   24   25   26   27   28   29   30   31   32   33
   14   15   16   17   18   19   20   21   22   23   24   25   26   27   28   29   30   31   32   33   34
   15   16   17   18   19   20   21   22   23   24   25   26   27   28   29   30   31   32   33   34   35
   16   17   18   19   20   21   22   23   24   25   26   27   28   29   30   31   32   33   34   35   36
   21   22   23   24   25   26   27   28   29   30   31   32   33   34   35   36   37   38   39   40   41
   22   23   24   25   26   27   28   29   30   31   32   33   34   35   36   37   38   39   40   41   42
   23   24   25   26   27   28   29   30   31   32   33   34   35   36   37   38   39   40   41   42   43
   24   25   26   27   28   29   30   31   32   33   34   35   36   37   38   39   40   41   42   43   44
   25   26   27   28   29   30   31   32   33   34   35   36   37   38   39   40   41   42   43   44   45
   26   27   28   29   30   31   32   33   34   35   36   37   38   39   40   41   42   43   44   45   46
   31   32   33   34   35   36   37   38   39   40   41   42   43   44   45   46   47   48   49   50   51
   32   33   34   35   36   37   38   39   40   41   42   43   44   45   46   47   48   49   50   51   52
   33   34   35   36   37   38   39   40   41   42   43   44   45   46   47   48   49   50   51   52   53
   34   35   36   37   38   39   40   41   42   43   44   45   46   47   48   49   50   51   52   53   54
   35   36   37   38   39   40   41   42   43   44   45   46   47   48   49   50   51   52   53   54   55
   36   37   38   39   40   41   42   43   44   45   46   47   48   49   50   51   52   53   54   55   56
   41   42   43   44   45   46   47   48   49   50   51   52   53   54   55   56   57   58   59   60   61
   42   43   44   45   46   47   48   49   50   51   52   53   54   55   56   57   58   59   60   61   62
   43   44   45   46   47   48   49   50   51   52   53   54   55   56   57   58   59   60   61   62   63
   44   45   46   47   48   49   50   51   52   53   54   55   56   57   58   59   60   61   62   63   64
   45   46   47   48   49   50   51   52   53   54   55   56   57   58   59   60   61   62   63   64   65
   46   47   48   49   50   51   52   53   54   55   56   57   58   59   60   61   62   63   64   65   66

Best Answer

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