calling elements in matrix

Question

sampath kumar punna 2019-10-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/488115-calling-elements-in-matrix

回答： Vinai Datta Thatiparthi 2019-11-5

31 31 31 31 31 31 31 31 31 31 31 31 31 31 31

42 42 42 42 42 42 42 42 42 42 42 42 42 42 42

21 21 21 21 20 20 20 20 21 21 21 21 20 20 20

19 19 34 34 19 19 34 34 19 19 34 34 19 19 34

6 9 6 9 6 9 6 9 6 9 6 9 6 9 6 9 6

if we have this huge matrix i have to call only this postions [3 4 6 9 ]

can i know how to do this

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Fabio Freschi 2019-10-29

if you want to extract specific elements of a matrix you need the row and the col index. You provided only a vector. Which elements do you want to extract?

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Answer 1

Vinai Datta Thatiparthi 2019-11-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/488115-calling-elements-in-matrix#answer_399877

Hi Sampath!

As Fabio mentioned, you can use both the row and column indices to get values out of a matrix of any size. Else, if you give a vector as the index (like in your question), MATLAB returns the values at the positions mentioned in the vector from the input matrix, but column wise (since column-major is the default in MATLAB).

Hope this helps!