save the change to a variable in a function

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越琪吴 2020-10-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/608466-save-the-change-to-a-variable-in-a-function

评论： Rik 2020-10-10

In my project, I need to use some functions periodicly. But I found that even the value of a variable is changed in the first function, the second function still can't use the new value, how can I solve the problem if I don't want to use global?

Any help will be appreciated!

Thank you!

*part of my main code is shown below, t means time

if t>g && t<=g+o
            plot(x1,y1,'.y','MarkerSize',35);c1=2;
            plot(x2,y2,'.y','MarkerSize',35);c2=2;
            plot(x3,y3,'.y','MarkerSize',35);c3=2;
            plot(x4,y4,'.y','MarkerSize',35);c4=2;
            cfnorth(w,north,z,cnt1,a1,b1);
            cfeast(w,east,z,cnt2,a2,b2);
            cfsouth(w,south,z,cnt3,a3,b3);
            cfwest(w,west,z,cnt4,a4,b4);
            movecars(z,jaywalk,w,p,cnt1,a1,b1,c1,f1,pass1,cnt2,a2,b2,c2,f2,...
            pass2,cnt3,a3,b3,c3,f3,pass3,cnt4,a4,b4,c4,f4,pass4);
            pause(1);
            M(t)=getframe;
        end
        if t>g+o && t<=g+o+r
            plot(x1,y1,'.g','MarkerSize',35);c1=3;
            plot(x2,y2,'.r','MarkerSize',35);c2=1;
            plot(x3,y3,'.g','MarkerSize',35);c3=3;
            plot(x4,y4,'.r','MarkerSize',35);c4=1;
            cfnorth(w,north,z,cnt1,a1,b1);
            cfeast(w,east,z,cnt2,a2,b2);
            cfsouth(w,south,z,cnt3,a3,b3);
            cfwest(w,west,z,cnt4,a4,b4);
            movecars(z,jaywalk,w,p,cnt1,a1,b1,c1,f1,pass1,cnt2,a2,b2,c2,f2,...
            pass2,cnt3,a3,b3,c3,f3,pass3,cnt4,a4,b4,c4,f4,pass4);
            pause(1);
            M(t)=getframe;
        end
        ...

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Mohammad Sami 2020-10-9

在 MATLAB Online 中打开

If you use function, you need to return the variable that are changed. Then assign the outputs of the function. For example

if true
  [A,B,C] = functionone(A,B,C,D,E);
  [C,D,X] = functiontwo(A,B,C);
end

Rik 2020-10-10

Comment posted as flag by 越琪吴:

this answer exactly solve my problem! Thank you soooooooooooooooo much! My appreciation is beyond description!

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