How to make string from matrix?

Hello everyone.. Can anoyne help me with this.. I have matrix with dimension 662x2 for example

   y=[111 20;123 43;117 89;....] on so on

and form that matrix I need to make string but in every new row to put '#' so matrix y should be converted in string like this

yy='111 20#123 43#117 89#..' and so on

Thank you!

Answer 1

[Azzi Abdelmalek]

A=magic(4)
B=[num2cell(A');repmat({'#'},1,size(A,1))]
out=strjoin(cellfun(@num2str,B(:)','un',0))

[Lolipop]

Thank you

Answer 2

[Star Strider]

This works:

yy = sprintf('%d %d#', y');

[Lolipop]

Thank you this works as well