How to find out how many colums are in matrix?

[filename filepath]=uigetfile('*.xlsx','multiselect','on')
length(filename)

How to find out how many columns or length (what is better?) are in the matrix [filename]?

If I select 2 files (test0.xlsx and test1.xlsx) my ans = 2

If I select 1 file (test1.xlsx) my ans is 10, sth its wrong ;/

*I just want to do a script that will detect, maybe someone have good idea for that :)

if I have 1 selected file 
    something1
else I have 2 selected files 
    something2
end

Thanks for help

Answer 1

[Bruno Luong]

if ischar(filename) % you select 1 file
    something1
else % your filename is cell of char/string % I have 2 selected files 
    something2
end

Answer 2

[Geoff Hayes]

hawk5577 - use size to determine the dimensions in your matrix. Since you are interested in the number of columns, then

numFiles = size(filename, 2);

[hawk5577]

ans=10

I think it counts letters ;/