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 ▼ Eddie W. Shore Unregistered Posts: 764 Threads: 118 Joined: Aug 2007 11-04-2012, 11:41 AM I am attempting a plot where: x axis: x_1 and y axis: f(x_1) where x_k is determined by: x_1 = x_0 - f(x_0)/f'(x_0) (Newton's Method) So far my program is: NEWTPATH(t,n) BEGIN LOCAL k,w,y; RECT(); FOR k FROM 1 TO n DO t-(F1(t)/der(F1(X),X=t))- > w; F1(w)- > y; PIXON(w,y); w- > t; END; FREEZE; END; The "der" is the derivative funtion. The program either freezes at the input screen or gives me an "out of bounds" error. I have F1(X) already stored before running the program. Any ideas? Thanks! Eddie Edited: 4 Nov 2012, 11:43 a.m. ▼ Bunuel66 Unregistered Posts: 59 Threads: 5 Joined: Jul 2011 11-04-2012, 01:11 PM Have you checked that the derivative is never going null? Just my 2 cents... ▼ Eddie W. Shore Unregistered Posts: 764 Threads: 118 Joined: Aug 2007 11-04-2012, 01:44 PM I am not sure. When I tried debugging the program the calcualtor goes into "space" when it approaches the loop. Apparently, der(F1(X),X=t) isn't allowed in a program. I think this is what you meant by the derivative being null. Really dumb not to allow calculus functions. This is what I have now: NEWTPATH(g,n) BEGIN LOCAL k,w,y,h,d,X; RECT(); FOR k FROM 1 TO n DO F1(g)->h; der(F1(X),X=g)->d; t-h/d->w; F1(w)->y; PRINT(w); w->t; END; END; Now I get a syntax error on Line 8 every time. Even if I change the der(F1(X),X=g)->d to 1->d, I still get this error. I have no idea where I have the syntax error, I localized all the varaibles, including X. Edited: 4 Nov 2012, 1:56 p.m.

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