convert matrix to cell string with elements separated by delimiter

Question

How can I convert a matrix

A=[1,2,3;4,5,6]

to a cell of string

A_str = {'1_2_3';'4_5_6'};

Answer 1

One approach could be this -

%// Input
A=[1,2,3;4,5,6] 

%// Make a cell array with each element a string off each element of A
cells = cellfun(@(x) num2str(x),num2cell(A),'Uni',0)

%// Join the cells with strjoin using `_` as the delimiter 
A_str = arrayfun(@(n) strjoin(cells(n,:),'_'),1:size(cells,1),'Uni',0).'

Output -

A_str = 
    '1_2_3'
    '4_5_6'

Answer 2

Another approach, without loops:

A_str = num2str(A,'%i_');
A_str = mat2cell(A_str(:,1:end-1), ones(1,size(A_str,1)));

Answer 3

found this solution that seems faster

A=[1,2,3;4,5,6] 

A_str = cell(size(A,1),1);
for index_row = 1 : size(A,1)
    clear allOneString_temp
    allOneString_temp = sprintf('%.0f_' , A(index_row,:));
    A_str{index_row,:} = allOneString_temp(1:end-1);
end