Matrix(Matrix)

9 次查看（过去 30 天）
Prabhat Hegde
Prabhat Hegde 2020-4-10
回答： nada zaidi 2021-4-6
I am a new MATLAB user and am unsure of what operation is being carried out by the below chunk of code.
a=[1 1;1 2]
b=[1;0;0;1]
b(a(:),:)
ans =
1
1
1
0
a(:)
^obviously gives the column vector of a.
(a(:),:)
^selects all rows and columns in this column vector.
b(a(:),:)
^what does this chunk of code do?

请先登录，再回答此问题。

采纳的回答

James Tursa
James Tursa 2020-4-10
编辑：James Tursa 2020-4-10
The "a" values are simply being used as row numbers for indexing into b.
b(a(:),:)
= b([1;2;1;2],:)
which is equivalent to
[ b(1,:);
b(2,:);
b(1,:);
b(2,:)]
=
1
0
1
0

更多回答（1 个）

nada zaidi
nada zaidi 2021-4-6
B=A(2 -3 2 -4)

类别

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

标签

产品


版本

R2020a

Community Treasure Hunt

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

Start Hunting!

Translated by