MATLAB: Text output to a file

fprintfoutputtext file

Trying to essentially create a table similar to this 
iter     xL      f(xL)       xU       f(xU)        xR     f(xR)        ea
  1  10.00000 -528.89877  50.00000 1772.65758 30.000000000 158.91822 100.00000
  2  10.00000 -528.89877  30.00000 158.91822 20.000000000 -238.72334  50.00000
  3  20.00000 -238.72334  30.00000 158.91822 25.000000000 -56.91554  20.00000
but instead I recieve the output in a sinlge line like this 
  
iter       xL   func(xL)         xU   func(xU)         xR   func(xR)         ea
 1	 10.00000 -528.89877  50.00000 1772.65758 30.000000000 158.91822  2	 10.00000 -528.89877  30.00000 158.91822 20.000000000 -238.72334  3	 20.00000 -238.72334  30.00000 158.91822 25.000000000 ...
Im sure there is something with this part of the code but I dont know what else besides \n it could be 
while (1)
    xrold = xr;
    xr = (xL + xU)/2;
    iter = iter + 1;
    fprintf(fid,'%2i\t%9.5f %9.5f %9.5f %9.5f %9.9f %9.5f %9.5f\n',iter,xL,func(xL),xU,func(xU),xr,func(xr));
    if xr ~= 0 
        ea= abs((xr - xrold)/xr)*100; end 
    test = func(xL,varargin{:})*func(xr,varargin{:});
Below is the entire code : 
    function [root, ea , iter] = bisecting(func, xL, xU, es, maxit, varargin)
%bisect : root location zeroes
%uses bsection method to find the root of a func
%input: 
%func = function handle 
%xl, xu = lower and upper guesses
% es = desired relative error (default = 0.0001%) 
%maxit = maximum allowable iterations (default = 50) 
%output: 
%root = real root 
%ea = approximate relative error (%) 
%iter = number of iterations
if nargin<3, error('At least 3 input arguements required'),end
test = func(xL, varargin{:})*func(xU,varargin{:});
if test > 0, error('No sign change'),end
if nargin < 4 || isempty(es), es = 0.0001; end 
if nargin < 5 || isempty(maxit), maxit = 50;end
iter = 0; xr = xL;
fid = fopen('Bisecting.txt','wt');
fprintf(fid,'%2s %8s %10s %10s %10s %10s %10s %10s\n','iter',...
    'xL','func(xL)','xU','func(xU)','xR','func(xR)','ea');
while (1)
    xrold = xr;
    xr = (xL + xU)/2;
    iter = iter + 1;
    fprintf(fid,'%2i\t%9.5f %9.5f %9.5f %9.5f %9.9f %9.5f %9.5f\n',iter,xL,func(xL),xU,func(xU),xr,func(xr));
    if xr ~= 0 
        ea= abs((xr - xrold)/xr)*100; end 
    test = func(xL,varargin{:})*func(xr,varargin{:});
    if test < 0
        xU = xr;
    elseif test > 0
        xL = xr;
    else
        ea = 0; 
    end 
    if ea <= es || iter >= maxit, break, end
end 
root = xr;
fclose(fid); 
type bisecting.txt
Edit: I posted the incorrect code the first time

Best Answer

You have 8 % signs in your format specifier; however, you have provided only seven values. Specify the value of ea at the end
fprintf(fid,'%2i\t%9.5f %9.5f %9.5f %9.5f %9.9f %9.5f %9.5f\n',iter,xL,func(xL),xU,func(xU),xr,func(xr), ea)
                                                                                                       % ^ add this
Related Question