what does A(3, :) mean or A(:, 3)?
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James Tursa
2017 年 6 月 15 日
編集済み: James Tursa
2017 年 6 月 15 日
If A is a 2D matrix, then
A(3,:) is the 3rd row of A
A(:,3) is the 3rd column of A
If A is a multi-dimensional array, then a bit more explanation is required, which can be found here:
https://www.mathworks.com/help/matlab/ref/colon.html?searchHighlight=colon&s_tid=doc_srchtitle
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Philip Abel
2022 年 10 月 23 日
Given a matrix "a" with elements
a = [1 2 3; 4 5 6]
To find a(x,y), it is important to note that:
- x stands for row
- y stands for column.
- : stands for all
- thus, a(x,y) is the element where x and y intersects.
- a(1,3) : is the element on the intersection of row 1 and column 3.
- a(:,3) : are the elements on the intersection of all rows and column 3.
- a(1,:) : are the elements on the intersection of row 1 and all columns.
a = [1 2 3; 4 5 6];
p = a(1,3)
q = a(:,3)
r = a(1,:)
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