end as Object Index
Define end
Indexing for an Object
When you use end
in an object indexing expression, such as A(4:end)
, the end
function returns the index value corresponding to the last element in that dimension.
Classes can overload the end
function to implement specialized behavior. If your class defines an end
method, MATLAB® calls that method to determine how to interpret the expression.
The end
method has the calling syntax:
ind = end(A,k,n)
The arguments are described as follows:
A
is the objectk
is the index in the expression using theend
syntaxn
is the total number of indices in the expressionind
is the index value to use in the expression
For example, consider the 3-by-5 array A
. When MATLAB encounters the expression:
A(end-1,:)
MATLAB calls the end
method defined for the object A
using the arguments:
ind = end(A,1,2)
These arguments mean that the end
statement occurs in the first index and there are two indices. The end
class method returns the index value for the last element of the first dimension (from which 1
is subtracted in this case). The original expression is evaluated as:
A(3-1,:)
For an example of an overload of end
in a class that customizes
indexing, see Customize Parentheses Indexing for Mapping Class.