calling elements in matrix

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sampath kumar punna
sampath kumar punna 2019-10-29
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
  1 个评论
Fabio Freschi
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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回答（1 个）

Vinai Datta Thatiparthi
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!

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