simplest way to print equations

given large A,b how to print the equations A(1,1) x_1 +A(1,2) x_2+..=b(1)

and preferably least amount of technicality?

[Walter Roberson]

print them to what output?

Is x_1 intended to indicate x subscript 1? As in you want literal 'x' and a subscript to appear?

[Standardtrickyness]

yes I want literally 'x_1' just print them as strings are probably fine

Answer 1

[Walter Roberson]

part1 = arrayfun(@(col) strcat( cellstr(num2str(A(:,col))), sprintf(' x_%d', col) ), 1:size(A,2), 'Uniform', 0);
part2 = horzcat(part1{:});
part3 = arrayfun(@(row) strjoin(part2(row,:), ' + '), 1:size(A,1), 'Uniform', 0);
part4 = strcat(part3(:), {' = '}, cellstr(num2str(b(:)) ));

part4 is now a cell array of strings, one per row in A