1. The problem statement, all variables and given/known data Fixed Point Iteration matlab program 2. Relevant equations To test for convergence: abs(g'(x))<1 3. The attempt at a solution Hi all, I am trying to write a Fixed Point Iteration program but when I enter in the command line it kept giving me an error message. Can you please look over my program and tell me what might have gone wrong? Thank you very much! First, I defined a function in a new M-File: function y=FUN3(x) y=5/(sin(x)*exp(-x./2)); Then, I opened up another M-File and wrote the program: function Xs = FixedIterationRoot3(FUN3,Xest,imax) syms x FUN3 FunDer3 Xi(1)=Xest; FUN3=5/(sin(x)*exp(-x./2)); FunDer3 = diff(FUN3) % To find g'(x) if abs(subs(FunDer3,x,Xest))>=1 % to check if g'(x) diverges return; fprintf('not valid') end for i=2:imax Xi(i)=feval(FUN3,Xest); Xest=Xi(i); Xs=Xi; end When I enter in the command line: >> xSolutions=FixedIterationRoot3('FUN3',-3,10) it gave me error message: syms x FUN3 FunDer3 ??? Output argument "Xs" (and maybe others) not assigned during call to "C:\Users\Jane\Documents\MATLAB\FixedIterationRoot3.m>FixedIterationRoot3".