[octave] size function

size function

https://www.gnu.org/software/octave/doc/v4.0.1/Object-Sizes.html#XREFsize


Built-in Function: size (a)
Built-in Function: size (a, dim)

    Return the number of rows and columns of a.

    With one input argument and one output argument, the result is returned in a row vector. If there are multiple output arguments, the number of rows is assigned to the first, and the number of columns to the second, etc. For example:

    size ([1, 2; 3, 4; 5, 6])
       ⇒ [ 3, 2 ]

    [nr, nc] = size ([1, 2; 3, 4; 5, 6])
        ⇒ nr = 3
        ⇒ nc = 2

    If given a second argument, size will return the size of the corresponding dimension. For example,

    size ([1, 2; 3, 4; 5, 6], 2)
        ⇒ 2

    returns the number of columns in the given matrix.

    
Testing:
    
a=[1, 2, 33;4 ,5, 6; 7 ,8, 66;55 ,476, 22]
a =

     1     2    33
     4     5     6
     7     8    66
    55   476    22

[rows columns]=size(a); 
rows =  4
columns =  3


size(a,1) # 1 means get rows ;  2 means get columns
ans =  4


size(a,2)
ans =  3



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