Random Matrix creation from the elements of a given vector

Dear all,

I have a vector A containing the elements [EI, VI, I, SI, M, SS, S, VS, ES]. I want to create a 7x20 random matrix using the elements from vector A. How can I do this?

Answer 1

[Voss]

M = A(randi(numel(A),7,20));

[Rajkumar Verma]

Thanks Voss for your help. I have one more query:

If I have two vectors, A = [EI, VI, I, SI, M, SS, S, VS, ES] and B = [CU, VU, SU, N, SR, VR, CR]. I want to create a 7x20 random matrix with elements in the form of ordered pairs, where the first element comes from vector A and the second element comes from vector B. How can I do this?

[Voss]

Like this?

A = 1:9;
B = 10:16;

MA = A(randi(numel(A),1,70));
MB = B(randi(numel(B),1,70));

M = reshape([MA; MB],[],7).'

M = 7x20

7 13 6 10 7 16 2 10 8 11 4 10 2 12 9 13 9 10 2 10 7 13 7 14 3 10 4 14 3 11 4 16 7 14 3 10 2 15 8 16 1 15 7 11 3 13 8 13 5 10 3 12 9 15 6 15 9 16 7 13 3 12 4 11 4 13 6 15 8 16 3 12 8 16 5 16 4 11 5 13 2 10 2 11 5 15 1 10 4 16 3 13 3 14 8 11 8 15 1 10 1 13 3 10 6 15 7 14 2 15 3 12 5 12 1 15 3 13 3 10 2 14 9 14 6 14 5 14 5 10 7 16 2 14 2 13 1 12 7 13

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[Rajkumar Verma]

Thanks.

[Voss]

You're welcome! Any questions, let me know.

[Rajkumar Verma]

If I have two intervals, A = [0,1] and B = [0,1]. I want to create a 5x10 random matrix with elements in the form of ordered pairs as (a,b), where the first element a comes from A and the second element b comes from B. Each element satisfy the condition a+b<=1. How can I do this in MATLAB?

[Voss]

I don't know what it means for a marix to have an ordered pair as an element, so I'm using two 5x10 matrices instead.

a = rand(5,10);
b = rand(5,10);

while true
    idx = a+b > 1;
    b(idx) = rand(nnz(idx),1);
    if all(a+b <= 1,'all')
        break
    end
end

disp(a)

    0.6803    0.1873    0.3608    0.1559    0.5003    0.0737    0.4319    0.9768    0.6602    0.7798
    0.7782    0.5313    0.2842    0.2559    0.6236    0.2574    0.2294    0.1369    0.3090    0.7058
    0.1423    0.9112    0.9561    0.1393    0.4185    0.1359    0.7159    0.1865    0.4885    0.3567
    0.7925    0.7438    0.2276    0.8216    0.8435    0.8321    0.3346    0.5175    0.2961    0.4162
    0.2621    0.3928    0.0201    0.8900    0.4407    0.2422    0.2344    0.4705    0.9059    0.6581

disp(b)

    0.3008    0.1674    0.5079    0.4175    0.4797    0.6370    0.0269    0.0078    0.0142    0.0654
    0.2051    0.2140    0.2644    0.0316    0.0441    0.6730    0.7432    0.0022    0.4761    0.1458
    0.2677    0.0308    0.0294    0.5593    0.5261    0.4142    0.1733    0.7507    0.2443    0.0694
    0.0950    0.1419    0.3965    0.1038    0.0673    0.0707    0.4720    0.1438    0.4402    0.4177
    0.7122    0.2491    0.5326    0.0557    0.1949    0.0756    0.3784    0.2126    0.0554    0.2765

disp(a+b)

    0.9811    0.3547    0.8687    0.5735    0.9800    0.7107    0.4587    0.9846    0.6744    0.8452
    0.9833    0.7453    0.5486    0.2875    0.6677    0.9304    0.9726    0.1392    0.7852    0.8516
    0.4100    0.9420    0.9855    0.6987    0.9446    0.5501    0.8892    0.9372    0.7329    0.4261
    0.8875    0.8857    0.6241    0.9254    0.9108    0.9028    0.8066    0.6612    0.7363    0.8340
    0.9743    0.6419    0.5526    0.9457    0.6357    0.3178    0.6128    0.6831    0.9613    0.9345

[Rajkumar Verma]

Thanks.

[Voss]

You're welcome