"When you specify * as the field precision operator, the other input arguments must provide both a precision and a value to be printed. Precisions and values can be pairs of arguments, or pairs within a numeric array."
So the precisions and values must be in pairs. Example:
M = [1 2 3 4; 5 6 7 8];
precision = 10;
[nrows,ncols] = size(M);
args = zeros(1,2*ncols); % row vector of precision/value pairs
args(1:2:end) = precision; % 1st, 3rd, 5th, etc., elements are the precisions
for ii = 1:nrows
args(2:2:end) = M(ii,:); % 2nd, 4th, 6th, etc., elements are the values from M
fprintf(" %10.*f",args)
fprintf("\n")
end
