How can I solve matrix selection extraction

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인범 황
인범 황 2022-6-28
回答： Neeraj Mirji 2022-6-28
Hello, I am a college student studying MATLAB.
I want to select columns 1-101, columns 103-203, 205-305, and columns 307-407 among the attached 309×816 matrices and make them into one matrix.
How can i solve it. Please let me know.
thank you

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回答（3 个）

Chunru
Chunru 2022-6-28
Ran in:
load C.mat
% select columns 1-101, columns 103-203, 205-305, and columns 307-407
% and make them into one matrix.
WhatYouWant = C(:, [1:101 103:203 205:305 307:407]);
% The : means all rows; [....] means the selected columns
whos
Name Size Bytes Class Attributes C 309x816 2017152 double WhatYouWant 309x404 998688 double ans 1x30 60 char cmdout 1x33 66 char
AMIT POTE
AMIT POTE 2022-6-28
You can go through the following documentation to understand indexing in MATLAB
Array Indexing - MATLAB & Simulink (mathworks.com)
Matrix Indexing in MATLAB - MATLAB & Simulink (mathworks.com)
Neeraj Mirji
Neeraj Mirji 2022-6-28
The following code extracts the mentioned columns into newMatrix.
newMatrix = C(: , [1:101 103:203 205:305 307:407]);
Check out Matrix Indexing documentation of better understanding.

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