How to get the output for the following code into the workspace?

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Urvi
Urvi 2012-10-19
My code is as follows:
function H = newmain
global b1 b2 b3;
b1=0;
b2=2.0;
b3=0.33;
options=odeset('InitialStep', 0.01, 'MaxStep', 0.01, 'RelTol', 10., 'AbsTol',10.);
[t2,y2]=ode45(@equation,[0:0.05:0.1],[1 2 0], options);
H = [t2 y2]
end
function dy=equation(t,y)
global b1 b2 b3
dy=zeros(3,1);
b1=b1+1-exp(-b3)
b2=b1-y(1)
b3=b1+b2+y(2)
dy(1)=-b1*y(1);
dy(2)=b3*y(1)+b2*y(2);
dy(3)=sqrt(b1)+y(1)+y(3);
end
How can directly get the values of b1 b2 b3 y1 y2 y3 at the same time instant in the workspace?
Thanks!

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2012-10-19
function dy=equation(t,y)
global c b1 b2 b3 y1 y2 y3
y1=y(1);y2=y(2);y3=y(3);
dy=zeros(3,1);
b1=b1+1-exp(-b3)
b2=b1-y(1)
b3=b1+b2+y(2)
dy(1)=-b1*y(1);
dy(2)=b3*y(1)+b2*y(2);
dy(3)=sqrt(b1)+y(1)+y(3);
c=[c; b1 b2 b3 y1 y2 y3]
add in your main program
global c b1 b2 b3 y1 y2 y3
y1=0;y2=0;y3=0;c=[];

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