Understanding the difference between normal multiplication between two vectors and multiplication with dot operator.

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chaaru datta
chaaru datta 2023-10-20
编辑： Stephen23 2023-10-20
Hello all, I am trying to understood the difference between normal multiplication and mutliplication with dot operator in caseof two vectors.
For example,
If we have two vector H of dimension 2 X 4 and B of dimension 4 X 1 then writing
Y = H*B % ---(1)
do not cause any error.
But if we write
Y = H.*B %--- (2)
then it gives the following error: Arrays have incompatible sizes for this operation.
Any help is highly appreciated.
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Walter Roberson
Walter Roberson 2023-10-20
MATLAB does not have any dot operator. MATLAB has a series of operators whos representation involves two characters, the first of which happens to be a dot.
So in A.*B that is not parsed as A followed by an operator '.' followed by an operator '*' followed by B: it is parsed as A followed by a single operator designated by '.*' followed by B.
This is similar to the way that A>=B is not parsed as A followed by a > operator then a = operator then B, but is instead A followed by a single operator designed by '>=' followed by B

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