Merging two arrays of two different types

How can I merge two arrays of two different typesI used the following code but lost the values of the array that contains numbers ????

a=[1 2 3]

a =

1 2 3

>> b=['aa'];

>> c=[a b]

c =###aa

Answer 1

[Jorg Woehl]

You are combining double values (from a) with character values (from b), which yields a character array according to MATLAB's class conversion rules. The doubles 1, 2, and 3 are converted to their Unicode character equivalents, which are control characters and only result in empty characters/whitespace when displayed.

If you want your resulting vector c to contain the numbers from a instead, first convert the doubles to characters using num2str. Using it on the array a will lead to additional whitespace, which you may or may not want... but you can strip that out using the replace function:

c = [num2str(a) b]
c =

    '1  2  3aa'
    
c = replace([num2str(a) b], ' ', '')
c =

    '123aa'