How can I create a heterogenous array using 'arrayfun' in MATLAB R2024b?

When I use 'arrayfun' to create a heterogenous array in MATLAB R2024b, it fails with an error: 

Mismatch in type of outputs
Why does this error occur, and how can I create a heterogenous array without any issues?

Answer 1

[MathWorks Support Team]

In MATLAB R2024b, 'arrayfun' cannot directly create a heterogenous array. However, you can accomplish this using 'horzcat' or an equivalent function.

First, when using 'arrayfun', specify the 'UniformOutput' name-value argument as 'false'. This will return a cell array, which can then be concatenated into a heterogenous array.

For example:

A = arrayfun(@(x) foo(x), X, 'UniformOutput', false);
A = horzcat(A{:});

The functions 'cat', 'horzcat', and 'vertcat' support creating heterogenous arrays of classes which derive from 'matlab.mixin.Heterogenous'. The documentation section A Class Hierarchy for Heterogeneous Arrays describes this in further detail.