Seperately extract 11th and 21st element of matrix A

1 次查看（过去 30 天）

显示更早的评论

N/A 2022-8-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1789055-seperately-extract-11th-and-21st-element-of-matrix-a

评论： Star Strider 2022-8-28

采纳的回答： Star Strider

Hi,

I took Mathlab programming this semester and am still new to all of this.

So basically, I've been given this matrix A (5x5) as shown below.

A=[17 24 1 8 15; 23 5 7 14 16; 4 6 13 20 22; 10 12 19 21 3; 11 18 25 2 9]

So my question is, how do I extract 11th and 21st element of matrix A?

Thank you.

4 个评论
显示 2更早的评论隐藏 2更早的评论

Torsten 2022-8-28

编辑：Torsten 2022-8-28

A_11_and_21 = [A(3,1),A(5,1)]

dpb 2022-8-28

在 MATLAB Online 中打开

<learn_matlab/array-indexing.html> is section in Getting Started doc about addressing arrays including this which is called linear indexing.

If in addition to the example you really were interested in traversing the array by row instead of column, then

M = reshape((1:25).', 5, [])*10;
M=M.';                              % transpose first
V = M([11 21])
V = 1×2
    30    50

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Star Strider 2022-8-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1789055-seperately-extract-11th-and-21st-element-of-matrix-a#answer_1036135

移动：Matt J 2022-8-28

在 MATLAB Online 中打开

MATLAB generally uses columnwise linear indexing, so:

M = reshape((1:25).', 5, [])*10
M = 5×5
    10    60   110   160   210
    20    70   120   170   220
    30    80   130   180   230
    40    90   140   190   240
    50   100   150   200   250
V = M([11 21])
V = 1×2
   110   210

2 个评论
显示无隐藏无

N/A 2022-8-28

移动：Matt J 2022-8-28

Got it, thanks so much for your help! :)

Star Strider 2022-8-28

As always, my pleasure!

请先登录，再进行评论。

类别

MATLAB Language Fundamentals Matrices and Arrays

在 Help Center 和 File Exchange 中查找有关 Matrices and Arrays 的更多信息

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by