I receive different output to like input

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omri dagan 2022-11-1

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https://ww2.mathworks.cn/matlabcentral/answers/1840963-i-receive-different-output-to-like-input

评论： Gautam Chettiar 2022-11-1

采纳的回答： Voss

why is there diffrent in the outputs?

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Gautam Chettiar 2022-11-1

v' is the transpose, and when you are adding two 1-D arrays which have different dimensions, here of (1,5) and (5,1), MATLAB automatically casts a broadcasted matrix addition, hence both of matrices get converted to (5,5) dimension form with repeating columns and rows respectively. The output is exactly what it should be.

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Answer 1

Voss 2022-11-1

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0:4+5*(0:4)' is the same as 0:(4+5*(0:4)')

0:(4+5*(0:4)')
ans = 1×5
     0     1     2     3     4

v+5*v', where v is 0:4, is the same as (0:4)+5*(0:4)'

v = 0:4;
v+5*v'
ans = 5×5
     0     1     2     3     4
     5     6     7     8     9
    10    11    12    13    14
    15    16    17    18    19
    20    21    22    23    24
(0:4)+5*(0:4)'
ans = 5×5
     0     1     2     3     4
     5     6     7     8     9
    10    11    12    13    14
    15    16    17    18    19
    20    21    22    23    24