several questions for a beginner

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Eliraz Nahum
Eliraz Nahum 2018-9-21
评论： Image Analyst 2018-9-22
hello, I am trying to figure out when I have to use the "." sign before mathematical operations. I read that by writing, for example, v1.*v2, I mean that the multiplying is between the vectors components. On the other hand there were some cases in which it was written v1(3)*v2(3) without the "." So I try to understand when I should use it. thanks

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Stephen23
Stephen23 2018-9-21
编辑：Stephen23 2018-9-21
The difference is explained here:
https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html
Short summary:
  • matrix operations ( without the dot) use rules of linear algebra, or solve systems of equations.
  • array operations ( with the dot) perform element-wise operations.
Read the link above and the help for each specific operator to know what it does. More detailed explanations:
https://www.mathworks.com/matlabcentral/answers/417192-what-is-the-different-between-b-2-and-b-2
https://www.mathworks.com/matlabcentral/answers/417469-issue-with-a-a
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Image Analyst
Image Analyst 2018-9-22
Eliraz's "Answer" moved here since it's a comment to Stephen rather than an "Answer" by Elirah to his original question.
thanks a lot!

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