for loop
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
how to use 'for' in a nested loop and get a result quickly for example I write this code:
%%%%%%%%%%%%%%%%%%
Ac=reshape(Ac,1,[]);
Ac_estm=reshape(Ac_estm,1,[]);
P=size(Ac,2);
T=reshape(T,1,[]);
for(p=1:P)
delta=d*Ac(p);
if(T(p)==0)
while(Ac(p)<=Ac_estm(p)-delta)
Ac(p)=Ac(p)-1;
end
else
while(Ac(p)>=Ac_estm(p)+delta)
Ac(p)=Ac(p)+1;
end
end
end
%%%%%%%%%%%%%
but the execution is very slow and stops over the counter at 9
(T is logical and length(T)>= length(Ac) and length(Ac)=length(Ac_estm))
4 commentaires
Andrei Bobrov
le 27 Avr 2011
while(Ac(p)<=Ac_estm(p)-delta)
Ac(p)=Ac(p)-1;
end
here perhaps Ac(p)-> -inf
while(Ac(p)>=Ac_estm(p)-delta)
Ac(p)=Ac(p)+1;
end
and here perhaps Ac(p)-> +inf
Andrei Bobrov
le 27 Avr 2011
use variant
while(Ac(p)<=Ac_estm(p)-delta)
Ac(p)=Ac(p)+1;
end
while(Ac(p)>=Ac_estm(p)-delta)
Ac(p)=Ac(p)-1;
end
Réponse acceptée
Andrei Bobrov
le 27 Avr 2011
variant without loop
delta = d*Ac;
t = T==0;
R = Ac - Ac_estm;
R1 = R + delta;
R2 = R - delta;
t1 = sign(R1) <= 0;
t2 = sign(R2) >= 0;
Ac(t & t1) = Ac(t & t1) + ceil(abs(R1(t & t1)));%changed sign
Ac(~t & t2) = Ac(~t & t2) - ceil(abs(R2(~t & t2)));%changed sign
variant with loop
Ac=reshape(Ac,1,[]);
Ac_estm=reshape(Ac_estm,1,[]);
P=size(Ac,2);
T=reshape(T,1,[]);
for p=1:P
delta=d*Ac(p);
if T(p)==0
t = Ac(p) - Ac_estm(p) + delta;
t1 = t(t<=0);
else
t = Ac(p) - Ac_estm(p) - delta;
t1 = t(t>=0);
end
Ac(p) = Ac(p) - sign(t1)*ceil(abs(t1));
end
Plus de réponses (0)
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!