MATLAB: Explanation for syntax of arrayfun

Question

Hello

    can anyone explain the syntax of the following code pls...
   B= arrayfun(@(x) x, A, 'uni', 0);

thanks in advance

Answer 1

Abirami - see the documentation at arrayfun for details on the usage of this function. From your example,

B = arrayfun(@(x) x, A, 'uni', 0);

arrayfun will apply the anonymous function @(x) x on each element of A. The uni string must be equivalent to UniformOutput being set to 0 (or false) which from the documentation states Requests that the arrayfun function combine the outputs into cell arrays B1,...,Bm. The outputs of function func can be of any size or type. So here, func is the anonymous function.

Suppose

 A = [1:5]'
 A =
     1
     2
     3
     4
     5

then

 B = arrayfun(@(x) x, A, 'uni', 0)
 B = 
    [1]
    [2]
    [3]
    [4]
    [5]

The output B is a 5x1 cell array. B is identical to A since our anonymous function would take in an element (x) and then just return it. If we had

 B = arrayfun(@(x) 2*x, A, 'uni', 0)
 B = 
    [ 2]
    [ 4]
    [ 6]
    [ 8]
    [10]

So each element in B is double that of A. Note that if we removed the uni option (and its value)

 B = arrayfun(@(x) 2*x, A)
 B =
     2
     4
     6
     8
    10

Then B is no longer a cell array.