replace the elements of a vector with an element sequence

Hello,

Consider a 100x1 matrix with random values from 1 to 3.

How can replace all the values with an element sequence of 4 elements, such as:

all 1 with 0100

all 2 with 1001

all 3 with 0001

Thank you.

Best,

Pavlos

Answer 1

[Andrei Bobrov]

A = [0 1 0 0;1 0 0 1;0 0 0 1];

B = randi(3,100,1);

out = A(B,:);

for negative values:

B2 = [-1 -0.5 -0.25];
[l0,ii] = ismember(B,B2);
out = nan(numel(B),size(A,2));
idx = ii(l0);
out(l0,:) = A(idx,:);

[pavlos]

Hello,

How can I do the same if the 100x1 matrix contains negative values.

For example, instead of 1, 2, 3 consider -1, -0.5, -0.25

Thank you.

[Andrei Bobrov]

Please see answer by Jos

Answer 2

[Jos (10584)]

% values V(k) in B should be mapped to row A(k,:)
A = [0 1 0 0;1 0 0 1;0 0 0 1] 
V = [-1 -0.5 -0.25]

B = [-1 -0.5 -1 -0.25 -1 -0.25 -0.5 -1 -1]
[~,k] = ismember(B,V)
out = A(k,:)

[pavlos]

Thank you very much!