Share data between two functions

Question

Califfo 2020-5-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/535223-share-data-between-two-functions

评论： Califfo 2020-5-28

Hi,

I need to update and share a variable between two functions to solve a system of ODEs. These functions are, respectively, odefun - the function that ode45 accepts as input - and myOutputFcn - that is the custom output function that ode45 accepts as option.

function dsol_dt = odefun(t, sol, hyspar, L, M)
    
    dsol_dt = zeros(2,1);
    
    u     = sol(1,1);
    y     = sol(2,1);
    
    fri = hyspar.fri;
    ud = y;
    yd = - L(y,fri) / M ;
    
    dsol_dt = [ud; yd];
end

function status = myOutputFcn(t,sol,flag,hyspar)
    
    switch flag
        case 'init'
            
        case ''
             
            hyspar.fri = RestoringForce(sol(1),sol(2),ecc,hyspar);
            
        case 'done'
            assignin('base','hyspar.fri',fri);
    end
    status = 0;
end

I would share and update the variable that is hyspar.fri (fri). When it updates in myOutputFcn through the function RestoringForce, I am only changing the local copy. So, in odefun will not be taken the updated value of the variable fri.

I read the main techniques to share variables between workspaces

https://it.mathworks.com/help/matlab/matlab_prog/share-data-between-workspaces.html

but I didn't find any examples that suit me, I guess...

I would like to specify that I can't call RestoringForce in odefun for several different reasons.

Kind regards

Califfo

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Answer 1

darova 2020-5-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/535223-share-data-between-two-functions#answer_440469

What abuo this?

function [hyspar1,status] = myOutputFcn(t,sol,flag,hyspar)    
    switch flag
        case 'init'
            
        case ''
             
            hyspar.fri = RestoringForce(sol(1),sol(2),ecc,hyspar);
            
        case 'done'
            hyspar1 = hyspar;
            hyspar1.fri = fri;
    end
    status = 0;
end

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Califfo 2020-5-28

Thank you darova. However, I must update and share the variable after each integration step. Additionally, the variable hyspar.fri(fri) still does not update even if you add the output hyspar to the function myOutputFcn

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