How do I create a header with many elements, but has function outputs in it as well?

I am trying to create a header for a large matrix. The matrix looks something like this:

A =

 [100, 101, 102, ..., 999
  990, 454, 565, ..., 453
   .    .    . , ...,  .
   .    .    . , ...,  .
  some numbers , ..., 345]

num = [100 101 102 ... 999]

I also have an array that counts occurrences of specific elements in each column.

number = [4 6 7 5 ... 3] where there are 900 elements in this array

I would like to create a header so the output looks like this:

 [100=4, 101=6, 102=7, ..., 999=something
  100,    101,  102,   ..., 999
  990,    454,  565,   ..., 453
   .       .     . ,   ...,  .
   .       .     . ,   ...,  .
  some numbers     ,   ..., 345]

I have tried

for idx = 1:length(num)
  header{idx} = num(idx) '=' number(idx)};
end

but I am really confused on the syntax for this and when I want to combine the header with A.

Answer 1

[Walter Roberson]

for idx = 1:length(num)
  header{idx} = sprintf('%d = %d', num(idx), number(idx));
end

result = [header; num2cell(A)];

[Tony]

Thank you very much for the help!