global variables in fmincon

Question

Philipp Siebel 2020-4-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/515775-global-variables-in-fmincon

回答： Anmol Dhiman 2020-4-9

采纳的回答： Anmol Dhiman

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Hi there,

at the moment I am using the fmincon function to identify parameters in a given equation to find a selected point x.

For example,

I have the value for x and the fmincon should find the values for (u,v,t)

x=t*sin(u)*cos(v)

Therefore the code is running with a global variable. Does anyone know how to use this without any global variables????

%%% CODE %%%%
globalx
x=2
... some constraints...
fun = @myfun;
X = fmincon(fun,x0,A,b,Aeq,beq,minW,maxW,[],opts);
functionF = myfun(ZW)
	globalx
	u = ZW(1);
	v = ZW(2);
	t = ZW(3);
	.
	.
	.
	some calculations...
	.
	.
	.

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Answer 1

Anmol Dhiman 2020-4-9

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/515775-global-variables-in-fmincon#answer_424919

Hi Philipp,

Global variables are used to share a single value among various functions.

There are many other ways to do. You can refer to

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

The most secure way to extend the scope of a function variable is to use function input and output arguments, which allow you to pass values of variables.

Thanks,

Anmol Dhiman