global variable inside a function

Question

Babak 2014-8-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/152330-global-variable-inside-a-function

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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Answer 1

AJ von Alt 2014-8-25

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/152330-global-variable-inside-a-function#answer_149813

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.