Using If for syms
1 visualización (últimos 30 días)
Mostrar comentarios más antiguos
Hi,
I hope you are keeping safe.
I have a urgent question in matlab. Could you please give me sime advice in this regard. I wrote following code where
"function F = fun(x,y,alpha1,alpha2,beta1,beta2,lambda)
F= log((1+alpha1*x./(1+alpha2*y))) -lambda*log((1+beta1*x./(1+beta2*y)));
end"
Main Code
Z=fun(x,P-x,alpha1,alpha2,beta1,beta2,lambda);
z=solve(Z==0);
for i=1:length(z)
z(i,1)=piecewise(z(i,1)<=0,0)
y(i)=P-z(i,1)
S(i)=fun(z(i,1),y(i),alpha1,alpha2,beta1,beta2,lambda)
end
I want to z(i,1)=0 if z(i,1)<=0 or complex and if z(i,1)>0, claculate S(i) but there is a problem with piecewise() which cannot be solved for me.
Could you please help me to write it. P, alpha1, alpha2, beta1, beta2, and lambda are desired positive valuse.
Many Thanks in advance.
0 comentarios
Respuestas (1)
Walter Roberson
el 6 de Mzo. de 2021
subs(piecewise(x<3,0),x,5)
ans = NaN
That is, if no condition is matched by the piecewise then the output is undefined, NaN. Not 0 or empty.
piecewise(imag(z(i))~=0 || z(i)<0, 0, S(i))
6 comentarios
Ver también
Categorías
Más información sobre Assumptions en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!