how to see previous results while tabulating?

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Hi All,
I've written a code using Newton-Raphson algorythm but i have problems with tabulating. I want to tabulate my results in a form which first column corresponds "it_no"(iteration number),second column corresponds "x", third column corresponds "f(x)". But I'm only getting the last results of iteration, i.e it_no 9;
Here is the code
f=@(x)x^5-x^4+(2*x^3)-(3*x^2)+x-4
dfdx=@(x)(5*x^4)-(4*x^3)+(6*x^2)-(6*x)+1
x0=5
x=x0
it_no=0
while 1
f(x)
it_no=it_no+1
xprev=x
x=xprev-(f(x)./dfdx(x))
if f(x)<10^-4
break
end
end
fprintf('\n\n%18s%18s%18s\n','it_no','x','f(x)')
fprintf(' %17.0f\t %17.7f\t %17.7f\t\n',[it_no,x,f(x)])
I want to see all results from first iteration to last iteration. Anyway to see previous results in my table?
I'll appreciate for any help
Thanks Already!

采纳的回答

John Petersen
John Petersen 2012-11-8
编辑:John Petersen 2012-11-8
Change where you put your print statements to see running total.
fprintf('\n\n%18s%18s%18s\n','it_no','x','f(x)');
while 1
it_no=it_no+1;
xprev=x;
x=xprev-(f(x)./dfdx(x));
if f(x)<10^-4;
break
end
fprintf(' %17.0f\t %17.7f\t %17.7f\t\n',[it_no,x,f(x)]);
end
For faster code, you could vectorize it, but it would print after the loop not while running in the loop.

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