about cat function in matlab

 c(:,:,1) =

     1     2     3
     4     5     6

 c(:,:,2) =

     7     8     9
    10    11    12

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

[Stephen23]

What does this have to do with cat ?

Answer 1

[dpb]

doc colon % can (and will)...

Answer 2

[Stephen23]

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