error in fminbnd and in my live function
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
i have to find the minimum Radius and Area using two equations:
V = 1/3 * pi*r^2*h and A = pi*r*sqrt(r^2 + h^2)
first i had to find area without using h, so i solved V for h, then substituted
A = pi*r*sqrt(r^2 + V/((1/3)*pi*r^2))
I then had to make a live function detailing this, using V as a global V
function A = area
global V = 10 % constant volume in in^3
r = radius; % changing radius in inches
A = pi*r*sqrt(r^2 + V/((1/3)*pi*r^2));
end
my next step was to find the minimum r and area
[rmin,Amin] = fminbnd(@area, 0.5, 5)
this got me two error messages
- Incorrect use of '=' in the live function
- error in fminbnd : x= xf; fx = funfcn(x, varargin{:})
How do i fix these errors?
0 commentaires
Réponses (1)
Torsten
le 18 Oct 2022
Modifié(e) : Torsten
le 19 Oct 2022
Don't you have to include the circular area G = pi*r^2 at the bottom ?
Then add pi*r^2 to A as indicated below.
V = 10; % constant volume in in^3
[rmin,Amin] = fminbnd(@(r)area(r,V),0,50)
hmin = V/(1/3*pi*rmin^2)
function A = area(r,V)
A = pi*r*sqrt(r^2 + (V/(1/3*pi*r^2))^2); %+ pi*r^2;
end
0 commentaires
Voir également
Catégories
En savoir plus sur Loops and Conditional Statements dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!