Making a matrix of R*C size that takes the values randomly from an array- Y.

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MAzharul Islam 2021-8-18

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评论： MAzharul Islam 2021-8-18

I want to make a random matrix of R*C size that takes the values randomly from an array Y.

For example I want to make a 7*8 matrix that takes value from this array Y = [ 1 6 1 8 4 5], and place them randomly in the matrix.. I have tried randi command to do this, but randi doesn't take fixed values like I have stated above.

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Answer 1

Wan Ji 2021-8-18

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Hi, friend! randi is OK, it can help, look

Y = [ 1 6 1 8 4 5];
R = 7; C = 8;
indices = randi([1,numel(Y)], R, C);
A = Y(indices)

The result is

A =
   1     5     4     4     4     1     1
   1     8     1     1     5     6     1
   1     1     1     6     1     1     1
   1     8     5     1     1     4     5
   1     8     8     1     1     8     8
   8     1     8     8     6     6     1
   1     5     1     4     4     8     4
     

Wish you will like it

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Wan Ji 2021-8-18

Here, because 1 appears in Y array twice, its appearance possibility in matrix A is twice as much as other numbers( 6,8,4 and 5).

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Answer 2

Yazan 2021-8-18

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i1 = 7; i2 = 8;
y = [1 6 1 8 4 5];
randIdx = randi(length(y), 1, i1*i2);
data = reshape(y(randIdx), i1, i2)
data = 7×8
     6     4     5     6     5     1     1     4
     1     4     1     1     1     1     1     1
     1     1     1     1     8     1     6     1
     6     4     5     6     1     6     6     8
     4     5     8     1     6     4     8     8
     1     8     4     8     4     5     8     1
     6     6     8     1     4     6     5     1