CODEWITHSUNDEEP
arraysmatlab
flor1an
flor1an

Reputation: 980

Matlab accessing the inner array of a 2d array

Matlab is really driving me crazy on this point. I just want to access the inner array of a 2d array.

E.g.:

A = [1,1; 2,2; 3,3]
B = [4,4; 5,5; 6,6]
C = [7,7; 8,8; 9,9]
D = [0,0; 1,2; 3,4]

E = [A,B,C,D]

how do I get e.g. B out of E again?

By this I mean in the exact same writing styl like X = [4,4; 5,5; 6,6]

Upvotes: 1

Views: 100

Answers (2)

Xiangrui Li
Xiangrui Li

Reputation: 2426

You concatenated A, B, C, D horizontally into a new array E. That is not array of arrays, as the other answer pointed out. Suppose the new array is what you want. If you like to extract original B from E, you will need to know A and B's size, in this case both are 3x2. So You can do following:

X = E(:, 3:4); % 3 is size(A,2)+1, numel(3:4) is size(B,2)

Also I think you did not really mean "writing style", since that is just a way to write assignment.

Upvotes: 2

crown42
crown42

Reputation: 305

The syntax you use concatenates the array to a new one, it is not an array of arrays. If you want an array of arrays, you could use a cell, E = {A,B,C,D}. Then you can get B back using E{2}.

Cells are general containers, each element can contain whatever you want, it does not have to be the same data type. See What is a cell?

Upvotes: 3

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