How to find a global minimum?

If I try to search the minimum of the function (that now I use as example) y=(1.2^-x)*sin(x), writing the following code, I obtain a local minimum, depending on the starting point choice.

fun=@(x) (1.2^-x)*sin(x)

x0=4

[xmin,fval,exitflag,output]=fminunc(fun,x0)

xmin =

   4.532047925295373

fval =

-0.430572139266549

The value is correct looking at the function graph, but how can I find the global minimum? My function to minimize is more complicated, so it has a lot of local minima points, and it is impossibile to guess what is the best starting point

[Asatur Khurshudyan]

I am also searching for a similar algorithm. If you've found out something, please share.

[Nesrine Mohamed]

i try to search the global minimum of the function with two variablesany help please

Answer 1

[Torsten]

https://de.mathworks.com/help/gads/how-globalsearch-and-multistart-work.html

Best wishes

Torsten.