How to get the number of columns in a matrix

Question

Suppose I specify a matrix A like  A    1 2 3  4 5 6  7 8 9    how can I query A  without using length A   to find out it has 3 columns

User · Answer

While size A 2  is correct  I find it s much more readable to first define  rows     x  size x 1    cols     x  size x 2     and then use  for example  like this   howManyColumns in A   cols A  howManyRows in A      rows A    It might appear as a small saving  but size     1  and size     2  must be some of the most commonly used functions  and they are not optimally readable as-is

User · Answer

Use the size   function    gt  gt  size A 2   Ans       3   The second argument specifies the dimension of which number of elements are required which will be  2  if you want the number of columns   Official documentation

User · Answer

When want to get row size with size   function  below code can be used   size A 1    Another usage for it    height  width    size A    So  you can get 2 dimension of your matrix

[matlab] How to get the number of columns in a matrix?

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