how to combine two matrices?

Question

arian hoseini 2022-1-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1626115-how-to-combine-two-matrices

评论： arian hoseini 2022-1-11

采纳的回答： Les Beckham

A=[Pg; 0.5;0.6;0;0;0]

B=[0;0;0;0.7;0.7;0.7]

1)the answer i need is C=[Pg;0.5;0.6;0.7;0.7;0.7]

i tried C=[A,B] but thats not what i want.

2)how can i add zero to matrix D if first value of A is Pg.

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Answer 1

Les Beckham 2022-1-10

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Maybe this is what you want for #1:

Pg = 1; % example value for Pg
A=[Pg; 0.5;0.6;0;0;0]
A = 6×1
    1.0000
    0.5000
    0.6000
         0
         0
         0
B=[0;0;0;0.7;0.7;0.7]
B = 6×1
         0
         0
         0
    0.7000
    0.7000
    0.7000
C = A+B
C = 6×1
    1.0000
    0.5000
    0.6000
    0.7000
    0.7000
    0.7000

For #2:

if A(1) == Pg
    % Do something to D
end

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Les Beckham 2022-1-11

编辑：Les Beckham 2022-1-11

在 MATLAB Online 中打开

It really depends on what you want to do. In the specific example you give in the question the first three elements of B and the last three elements of A are zero so adding them essentially replaces those elements. This is true regardless of the sign of Pg.

If you want to combine a portion of A with a portion of B you could do something like this:

Pg = 1; % example value for Pg
A = [Pg; 0.5; 0.6; 2; 2; 2]; % note that I've replaced the zeros with twos as an example
B = [2; 2; 2; 0.7; 0.7; 0.7];
C = [A(1:3); B(4:6)]
C = 6×1
    1.0000
    0.5000
    0.6000
    0.7000
    0.7000
    0.7000

Note that we get the first three elements of A and the last 3 elements of B.

To learn more of the basics of Matlab (indexing is especially relevant to your questions), I suggest that you take advantage of the free online training available here: https://www.mathworks.com/learn/tutorials/matlab-onramp.html

arian hoseini 2022-1-11