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How are parallel with ode45

7 vues (au cours des 30 derniers jours)
omar A.alghafoor
omar A.alghafoor le 12 Nov 2020
Hi friends. i trying reduce execution time for my code ( system - differential equations ) by using parallel .
what are steps .... thanks in advance .
rows=1024;
cols=1024;
% interval=(rows*cols)/100;
interval=linspace(0,1,rows*cols);
[T,res]=ode45(@odefun,interval,[0.5;.4;.2]);%[0.5;.4;.2]);
% plot(T,res(:,1),T,res(:,2),T,res(:,3))
% legend('X','Y','Z')
k1=res(:,1);
k2=res(:,2);
k3=res(:,3);
function D=odefun(t,X)
x0=X(1);
y0=X(2);
z0=X(3);
a=35;
b=1.3;
c=3;
d=8;
e=10;
f=2;
g=5;
h=0.5;
x1=a*(y0-x0)+b*y0*z0;
y1=-c*x0*z0+d*y0+e*x0;
z1=f*x0*y0-g*z0+h*x0;
D=[x1;y1;z1];
end
  2 commentaires
James Tursa
James Tursa le 12 Nov 2020
Modifié(e) : James Tursa le 12 Nov 2020
Numeric solvers such as ode45( ) rely on calculating the derivatives with the current state. This must be done in a sequential stepping process because the future estimated state at the next step depends on the estimated solution at the current step. You can't run any future steps in parallel because they depend on the estimated solution being known at that future time, and you don't have that.
omar A.alghafoor
omar A.alghafoor le 23 Nov 2020
thank you

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Réponses (1)

Ameer Hamza
Ameer Hamza le 12 Nov 2020
MATLAB's ODE solvers do not support parallel processing capability.
  1 commentaire
omar A.alghafoor
omar A.alghafoor le 23 Nov 2020
thank you bro

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