how do i put iteration values into a vector?
2 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Hi, im creating a matlab function that uses the secant method to create an approximation, im trying to take the values that are calculated in my while loop and put them into one vector showing all the values computed at each iteration, i can get my final iterated value to be the first element in the vector but cant get the values calculated before to appear my while loop looks like this
xold=x0;
xa=x1-(f(x1)*(x1-xold))/(f(x1)-f(xold));
iter=0;
while abs(xa-xold)>=D;
iter=iter+1;
xnew=xa-(f(xa)*(xa-xold))/(f(xa)-f(xold));
xold=xa;
xa=xnew;
end
in this x0 and x1 are initial values, iter is the number of iterations and D is the tolerance level of the funtion
also where abouts in this function do i need to put the vector code to show the iterations?
0 Kommentare
Akzeptierte Antwort
Wayne King
am 7 Dez. 2013
Bearbeitet: Wayne King
am 7 Dez. 2013
I'm not sure from your post, which values you want to retain over the life of the while loop, I'm assuming xnew
I would set the iter to 1 because you can't index a vector from zero in MATLAB and then increment the iter loop counter at the end of the while loop.
Without knowing all your variables, I can't test this, but does the following work?
xold=x0;
xa=x1-(f(x1)*(x1-xold))/(f(x1)-f(xold));
iter=1;
X = [];
while abs(xa-xold)>=D;
X(iter) =xa-(f(xa)*(xa-xold))/(f(xa)-f(xold));
xold=xa;
xa=xnew;
iter=iter+1;
end
3 Kommentare
Siehe auch
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!