matlab- syntax question

   I saw a following matlab code. there is a "." (dot) after "w1". what is the meaning of that dot? I try to remove it, and I don't see any different in the result.

plot (x_sin)
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In matlab,* is matrix multiplication.


a=[1 2 3]; % row vector
b = [1;2;3]; % column vector

b*a =
  1  *  *
  *  4  *
  *  *  9

I'm not going to write it out, but you get the picture.

If you just want to multiply the first element of a times b, the second, etc. then use .*

b.*a = [1 4 9]

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hsuyfAuthor Commented:
thank you very much!!!
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Math / Science

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