global variable inside a function

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Babak
Babak 2014-8-25
编辑： per isakson 2014-8-26
Hello every one, In my program I used a solver (ODE45) and as you know, for this purpose I need to define a function. I have an element in my function that change with respect to time. For having time in my function I defined global time but unfortunately I got array of my time. I need to have exact time that solver is using!!. What should I do?
t=0:0.001:2;
[tout,y]=ode45(@(t,X) sys1(X,B,L,Rr),t,zeros(50,1));
%%my function %%
function xdot=sys1(X,B,L,Rr)
global t;
Va=208*cos(2*pi*60*t);
…
end
Thanks in advance.

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回答（1 个）

AJ von Alt
AJ von Alt 2014-8-25
There is no need to use a global. You can pass t in as an argument to your ode function. Example 3 of the ode45 documentation demonstrates this usage.

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