what does the x(10:15) mean?

if ‘x’ is a row vector, does matrix multiplication of the transposed 5 elements of ‘x’ from ‘x(10)’ to and including ‘x(15)’ (to create a column vector) by the elements of ‘x(4:9)’ to create a matrix. If ‘x’ is a column vector, this calculated the dot product instead.

See the documentation on Array vs. Matrix Operations (link) for a relevant discussion.

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Torsten 2018-10-31

I think - depending on whether x is a row or column vector - y_hat is a 6x6 matrix or a scalar.

Star Strider 2018-10-31

@Torsten — Oops! I did not see the transpose!

I revised my Answer accordingly.

Thanks!

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Answer 2

madhan ravi 2018-10-31

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编辑：madhan ravi 2018-10-31

在 MATLAB Online 中打开

x(10:15)

it means elements from 10 to 15 are picked from vector x

see example:

>> x=1:15
x =
    Columns 1 through 13
       1     2     3     4     5     6     7     8     9    10    11    12    13
    Columns 14 through 15
      14    15
>> x(11:15)
ans =
      11    12    13    14    15
>>