Mix two different size arrays

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tori lansing 2023-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/2022847-mix-two-different-size-arrays

评论： tori lansing 2023-9-20

How do i mix two different size arrays i.e A=[a1 a2 a3...a12] and B=[b1 b2 b3...b9] so that the resulting one is C={a1 b1 a2 b2 a3 b3...] and the longer vector is the ones whos values continue when the shorter one is exhausted of values. I also need to do this using horizontal concatenation, horzcat, reshape, lengths, zeros and ones matricies and other commands.

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Answer 1

Stephen23 2023-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/2022847-mix-two-different-size-arrays#answer_1313147

在 MATLAB Online 中打开

A = rand(1,3)
A = 1×3
    0.7096    0.8827    0.4324
B = rand(1,7)
B = 1×7
    0.4981    0.1477    0.8535    0.7647    0.1932    0.2252    0.5484
N = min(numel(A),numel(B));
C = [reshape([A(1:N);B(1:N)],1,[]),A(N+1:end),B(N+1:end)]
C = 1×10
    0.7096    0.4981    0.8827    0.1477    0.4324    0.8535    0.7647    0.1932    0.2252    0.5484

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Stephen23 2023-9-20

在 MATLAB Online 中打开

"I want to be able to understand the different parts of the code."

It is often useful to "break" down code when debugging or trying to understand code:

A = rand(1,3) % fake data (row vector)
A = 1×3
    0.7642    0.3381    0.8769
B = rand(1,7) % fake data (row vector)
B = 1×7
    0.4824    0.7981    0.5552    0.6184    0.0284    0.1195    0.3547
N = min(numel(A),numel(B)) % N = shortest vector length
N = 3
M = [A(1:N);B(1:N)] % 2xN matrix
M = 2×3
    0.7642    0.3381    0.8769
    0.4824    0.7981    0.5552
R = reshape(M,1,[]) % 1x(2*N) vector... but note the order!
R = 1×6
    0.7642    0.4824    0.3381    0.7981    0.8769    0.5552
X = A(N+1:end) % remaining elements
X =

  1×0 empty double row vector
Y = B(N+1:end) % remaining elements
Y = 1×4
    0.6184    0.0284    0.1195    0.3547
C = [R,X,Y] % join them all together
C = 1×10
    0.7642    0.4824    0.3381    0.7981    0.8769    0.5552    0.6184    0.0284    0.1195    0.3547