Cell Array referencing question

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Rick 2014-7-4

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评论： the cyclist 2014-7-5

采纳的回答： the cyclist

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Hello,

Suppose I have

A = {1 2}
A = 
      [1]    [2]

and

B = {[1 2]}
B = 
      [1x2 double]

I am wondering, why are these different. Matlab Says A is a 1x1 cell, and B is a 1x2 cell. I am confused about what matlab is doing when it sees this and why it is being classified as such.

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the cyclist 2014-7-5

You might learn from this introduction to cell arrays.

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Answer 1

the cyclist 2014-7-4

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Your first statement is syntactically equivalent to

A = {[1],[2]};

This is specifying that A is a 1x2 cell array, where the first element is the length-1 vector [1], and the second element is [2].

In your second statement,

B = {[1 2]}

you have specified that B is a 1x1 cell array, where the contents of that one cell is the 1x2 vector [1 2].

Does that help?

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Rick 2014-7-4

How is matlab reading this?

B = {3,4}; C = [{3},{4}];

They are equivalent. B has two cells in one cell array. C is two cell arrays each containing one cell. Why are they the same?

the cyclist 2014-7-5

编辑：the cyclist 2014-7-5

In your first example, B is the direct specification of a 1x2 cell array.

In your second example, {3} is a 1x1 cell array, {4} is a 1x1 cell array, and then C is the concatenation of those "horizontally", creating a 1x2 cell array.

Hence, the equivalence.

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