I keep getting unexpected matlab error in line 1

function [xr ea iter] falsepos(func, xl, xu, es, maxit)
%function [xr ea iter] falsepos(func, xl, xu, es, maxit)
%False position method
fid = fopen('falsepos_out.txt','w');
fpritnf(fid, 'Iter.\t xl\t\t f(xl)\t\t f(xr)\t\t xu\t\t f(xu)\t\t ea\n');
if func(xl)*func(xu)>0, error('no sign change'); end
xold = xl;
for iter=1:maxit
    f1 = func(x1);

      fu = func(xu);
      xr = xu-((func(xu).*(xu-x1))./(func(xu)-func(x1)));
      fr=func(xr);
      ea = abs((xr-xold)/xr)*100; %approximate relative percent error
      test = f1*fr;
      if test<0, xu = xr;
      elseif test>0, x1 =xr;
      else ea = 0;
      end
      fprintf(fid, '%2d\t %8.5f\t %8.5 f\t %8.5f\t %8.5f\t %8.5 f\t %8.5f\t %8.1e\n',...
          iter,x1,f1,xr,fr,xU,fu,ea);
      if ea<es, break;end
      xold = xr;
  end

Answer 1

[Star Strider]

You are missing an equal (=) sign.

Try this:

function [xr ea iter] = falsepos(func, xl, xu, es, maxit)