several questions for a beginner

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Eliraz Nahum 2018-9-21

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https://ww2.mathworks.cn/matlabcentral/answers/420172-several-questions-for-a-beginner

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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Answer 1

Stephen23 2018-9-21

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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