about cat function in matlab

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rathod ujjval rameshbhai 2015-8-13

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编辑： Stephen23 2015-8-17

 c(:,:,1) =
     1     2     3
     4     5     6
 c(:,:,2) =
     7     8     9
    10    11    12

Can anyone tell me what does (: :) mean above?

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Stephen23 2015-8-14

编辑：Stephen23 2015-8-14

What does this have to do with cat ?

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Answer 1

dpb 2015-8-13

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https://ww2.mathworks.cn/matlabcentral/answers/233816-about-cat-function-in-matlab#answer_189239

在 MATLAB Online 中打开

doc colon % can (and will)...

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Answer 2

Stephen23 2015-8-14

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编辑：Stephen23 2015-8-17

The documentation is a really good place to find out how things work and what they do:

http://www.mathworks.com/help/matlab/ref/colon.html

http://blogs.mathworks.com/loren/2006/11/10/all-about-the-colon-operator/

In your examples the two colons mean "all elements along the first dimension (all rows), all elements along the second dimension (all columns)", whereas the 1 and 2 refer to the third dimension (page). To learn how MATLAB indexing works you should do the introduction tutorials:

http://www.mathworks.com/help/matlab/getting-started-with-matlab.html