How to use fzero to solve for a variable in an exponent?
4 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
I am trying to use fzero to find where two equations are equal to one another with respect to T, by setting them equal to one another and then subtraction one side from the other, f(t) - g(t) = 0. When I run the code posted below I dont get any error messages but nothing is printed out. Any Help would be greatly appreciated.
X1 = 0.5;
X2 = 0.5;
A12 = 1.6798;
A21 = 0.9227;
AW = 7.96681;
BW = 1668.21;
CW = 228.00;
AE = 8.04494;
BE = 1554.3;
CE = 222.65;
P = 763.712697;
gam1 = exp(A12*((A21*X2)/(A12*X1+A21*X2))^2);
gam2 = exp(A21*((A12*X1)/(A12*X1+A21*X2))^2);
function y = f(T)
y = gam1*X1*10^(AE - BE/(T+CE)) + (gam2*X2*10^(AW - BW/(T+CW))-P);
fun = @f; % function
T0 = 2; % initial point
z = fzero(fun,T0)
end
0 comentarios
Respuestas (1)
Star Strider
el 15 de Feb. de 2020
Take the fzero call out of the function it calls:
X1 = 0.5;
X2 = 0.5;
A12 = 1.6798;
A21 = 0.9227;
AW = 7.96681;
BW = 1668.21;
CW = 228.00;
AE = 8.04494;
BE = 1554.3;
CE = 222.65;
P = 763.712697;
gam1 = exp(A12*((A21*X2)/(A12*X1+A21*X2))^2);
gam2 = exp(A21*((A12*X1)/(A12*X1+A21*X2))^2);
function y = f(T)
y = gam1*X1*10.^(AE - BE./(T+CE)) + (gam2*X2*10.^(AW - BW./(T+CW))-P);
end
fun = @f; % function
T0 = 2; % initial point
z = fzero(fun,T0)
to get:
z =
80.0550
I also vectorised the ‘y’ assignment.
2 comentarios
Star Strider
el 22 de Feb. de 2020
My pleasure!
If my Answer helped you solve your problem, please Accept it!
Ver también
Categorías
Más información sobre Startup and Shutdown en Help Center y File Exchange.
Productos
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!