how to assign the value to the matrix

I have the string suppose 'aB@2', Now i first i want to create the matrix with the character of these string.

                     λ    a     B      @      2
                λ    0    a     B      @      2
                a    0   aa    aB     a@     a2
                B    0   Ba    BB     B@     B2
                @    0   @a    @B     @@     @2
                2    0   2a    2B     2@      4

Now,i have the text file containing these strings

122 Ba@2
123 a@2B
144 2@Ba

From the first string 122 Ba@2, the character after the first space is:

Ba@2 

i want to update the above matrix as

                    a   122    @      2       2
                    0   aa     aB     122    a2
                    0   122    BB     B@     B2
                    0   @a     @B     @@     122
                    0   2a     2B     2@      4

From this way i want update the above matrix along with the list of string in text file.

[Stephen23]

@rupak katwal: please show the expected output matrix for the example data you provide in your question.

Answer 1

[Dinesh Yadav]

I am attaching a code which helps you generate a cell array of how you want your matrix to look like. It’s a pseudo code, you can make changes to it to generalize it as you want.

After you have generated the cell matrix compare each element of cell matrix like if element(i,j)==”B”then replace it with 122 and so on for the other elements too.

z = ['a','B','@','2'];
z1 = ['a','B','@','2']; %copy of above array for simplicity of use
arr = cell(5,5);
for i = 1:5
    for j=1:5
        if(j==1)
            arr{i,j}=0;
        elseif (j~=1 && i==1)
            arr{i,j}= z(j-1);    
        else
            arr{i,j}=strcat(z(i-1),z1(j-1));
        end
            
    end
end

[Stephen23]

Note that [] is a concatenation operator, so

z = ['a','B','@','2'];

is just a complex way of defining this character vector:

z = 'aB@2';