Invalid syntax at 'x'. Possibly a ), }, ] is missing.

Hi everyone, I'm writing this code for a hw problem in class. for some reason, I'm getting a syntax error for "Unexpected Matlab expression". I cannot figure out what is wrong, but it seems to be a simple error that I'm just making a silly mistake on. It's giving me the error on the 'x' variable in line 9, column 15. Any help is greatly appreciated. Thank you!

x=0;         %set starting value
nmax=10;     %set max number of iterations
eps=1;       %initialize error bound eps
xvals=x;     %initialize array of iterates
n=0;         %initialize n (counts iterations)

while eps>=1e-5&n<=nmax                %set while-conditions
    y=x-(x^3-3x^2+6x-30)/(3x^2-6x+6)   %compute next iterate
    xvals=[xvals;y];                   %write next iterate in array
    eps=abs(y-x);                      %compute error
    x=y;n=n+1;                         %update x and n
end

Answer 1

[Image Analyst]

These two lines are fixed:

while eps>=1e-5 && n<=nmax                %set while-conditions
    y=x-(x^3-3*x^2+6*x-30)/(3*x^2-6*x+6)   %compute next iterate

When you multiply numbers by anything, you need to use *, like 3*x, not just 3x. Also you need && in your while test, not &

[Stefan]

Thank you very much! I knew it was a silly mistake...