Ho to subtract row from a row in a matrix?

Question

Atika 2022-9-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1802505-ho-to-subtract-row-from-a-row-in-a-matrix

回答： David Hill 2022-9-10

I want to subtract first row of a matrix from a second row.

Considering the matrix to be P= [1 4.6 -7.6 2.2 1.4 6.8 18.2 12; 1 5.6 7.4 2.8 11.4 4.8 28.2 -13; 8 9.5 11.7 13.8 12.6 4.7 -8.8 -23]

please answer this by using a single command.

also explain your answer a bit for me to understand.

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Star Strider 2022-9-10

在 MATLAB Online 中打开

With:

P= [1 4.6 -7.6 2.2 1.4 6.8 18.2 12;  1 5.6 7.4 2.8 11.4 4.8 28.2 -13; 8 9.5 11.7 13.8 12.6 4.7 -8.8 -23];

either

Out = [P(1,:)-P(2,:); P(3,:)]
Out = 2×8
         0   -1.0000  -15.0000   -0.6000  -10.0000    2.0000  -10.0000   25.0000
    8.0000    9.5000   11.7000   13.8000   12.6000    4.7000   -8.8000  -23.0000

or:

Out = diff(P)
Out = 2×8
         0    1.0000   15.0000    0.6000   10.0000   -2.0000   10.0000  -25.0000
    7.0000    3.9000    4.3000   11.0000    1.2000   -0.1000  -37.0000  -10.0000

.

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Answer 1

David Hill 2022-9-10

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1802505-ho-to-subtract-row-from-a-row-in-a-matrix#answer_1050750

在 MATLAB Online 中打开

P= [1 4.6 -7.6 2.2 1.4 6.8 18.2 12;  1 5.6 7.4 2.8 11.4 4.8 28.2 -13; 8 9.5 11.7 13.8 12.6 4.7 -8.8 -23];
p=P(2,:)-P(1,:)
p = 1×8
         0    1.0000   15.0000    0.6000   10.0000   -2.0000   10.0000  -25.0000