#test function after Rastrigin (1974), minimum value=-dimen
rastrigin_function <-
function(param_vec,maxwaittime=0) #objective function to be minimized
{
# dimen=length(param_vec);
obj=sum(param_vec^2-cos(2*pi*param_vec))
if (maxwaittime>0) #function to be run on slaves, with random delay
{
starttime=Sys.time()
waittime= runif(1,0,maxwaittime)
while (as.numeric(Sys.time()-starttime)<waittime)
{
}
}
return(obj)
}
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