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f=@(x)exp(-x)-x;
df=@(x)-exp(-x)-1;
root=fzero(f,0.6);
% N-R method
x(1)=1;
x(2)=x(1)-f(x(1))/df(x(1));
err_app(1)=1;
err_app(2)=abs((x(2)-x(1))/x(2));
i=2;
while err_app(i)>=eps
    i=i+1;
    x(i)=x(i-1)-f(x(i-1))/df(x(i-1));
    err_app(i)=abs((x(i)-x(i-1))/x(i));
end
iteration=[1:1:i];
plot(iteration, err_app);
 

prog.d(1): no identifier for declarator f
prog.d(1): expression expected, not '@'
prog.d(1): semicolon expected, not 'exp'
prog.d(1): found '-' when expecting ')'
prog.d(1): no identifier for declarator exp
prog.d(1): semicolon expected, not 'x'
prog.d(1): no identifier for declarator x
prog.d(1): semicolon expected, not ')'
prog.d(1): Declaration expected, not ')'
prog.d(2): no identifier for declarator df
prog.d(2): expression expected, not '@'
prog.d(3): no identifier for declarator root
prog.d(4): Declaration expected, not '%'
prog.d(6): found '2' when expecting ')'
prog.d(6): no identifier for declarator x
prog.d(6): semicolon expected, not ')'
prog.d(6): Declaration expected, not ')'
prog.d(7): found '1' when expecting ')'
prog.d(7): no identifier for declarator err_app
prog.d(7): semicolon expected, not ')'
prog.d(7): Declaration expected, not ')'

Standard output is empty